# AQA Synergy 1-9 – P3 & P4

### Force on a Spring

When a force acts on a spring it is stretched or compressed, its length will changes by an amount e from its original length. Demo In this tutorial you will learn how to calculate the force on a spring given its extension and spring constant. Note-Some mobile devices may require you to tap full screen during playback to view video content. The equation for this calculation is written like this: $F = { \text k \; \text x \; \text e}$ Chilled practice question Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam. Mark your solution and correct if needed. A spring is stretched 0.25 m, it has a spring constant of 20 N/m, calculate the force on the spring. Frozen practice question Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam. Mark your solution and…

### Force, Mass and Acceleration

An object of constant mass accelerates in proportion to the force applied. Demo In this tutorial you will learn how to calculate the force applied to an object if you are given its mass and acceleration. The equation for this calculation is written like this: $F = { \text m\; \text x \; \text a}$ Chilled practice question Calculate the force applied to cannon ball which accelerates at 7m/s2 which has a mass of 5 Kg. Frozen practice question A rocket has a driving force of 15 N and a mass of 250 g. Calculate the acceleration of the rocket. Science in context Force (N) = mass (kg) × acceleration (m/s²). Therefore, an object of constant mass accelerates in proportion to the force applied.

### Kinetic Energy

In physics, the kinetic energy (KE) of an object is the energy that it has due to its motion. It is defined as the work needed for an object of a known mass to accelerate to a given velocity. What is Kinetic energy? In physics, the kinetic energy (KE) of an object is the energy that it has due to its motion. It is defined as the work needed for an object of a known mass to accelerate to a given velocity. Kinetic energy equation To calculate Kinetic energy we write the equation like this. $E_k = { 1 \over2} mv {^2}$ Kinetic energy demo In this tutorial you will learn how to calculate the energy stored in a moving object. Chilled practice question Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam. Mark your solution and correct if needed. Calculate the Kinetic energy store in a car with a mass of 850 Kg moving at a velocity of 3.5 m/s. Frozen practice question Copy out the question and attempt to calculate the answer before watching the solution. Write…

### Power

The quantity power is the rate at which work is done. The quicker work is done the greater the power. What is Power? The quantity power is the rate at which work is done. The quicker work is done the greater the power. The standard metric unit of power is the Watt. The calculation of power is the work done in Joules divided by a unit of time seconds. 1 Watt is equivalent to 1 joule of work done per second. Many machines have their power rating displayed upon them in Watts, the higher the value the greater the power of the machine and the faster the rate of energy transfer. Power equation To calculate Power we write the equation like this. $P = { W \over \text{t}} = { E \over \text{t}}$ Power demo In this tutorial you will learn how to calculate power, the rate of doing work during an energy transfer. Chilled practice question Calculate the power of an electric fire if it transfers 950 KJ of energy in 5 minutes 30 seconds. Frozen practice question An electric heater has a power rating of 2200 W. How long to the nearest second does it take to transfer…

### Elastic Potential Energy

Stretching or squashing an object can transfer energy into its elastic potential energy store. What is Elastic potential energy? Stretching or squashing an object can transfer energy into its elastic potential energy store. Elastic energy is the mechanical potential energy stored in the material. Elastic energy occurs when objects are compressed, stretched or deformed. Elastic potential energy equation To calculate Elastic potential energy we use this equation. $E_e = { 1 \over2} ke {^2}$ Elastic potential energy demo In this tutorial you will learn how to calculate the energy stored in a stretched spring. Chilled practice question A spring is stretched 200 cm. The spring has a spring constant of 30 N/M. Calculate the stored elastic potential energy of the stretched spring. Frozen practice question Calculate the extension of a spring if it has a stored elastic potential energy of 540 J and a spring constant of 30 N/M. Science in context Stretching or squashing an object can transfer energy into its elastic potential energy store.

### Charge

The size of the current is the rate of flow of charge. Electrons are negatively charged particles which transfer energy through wires as electricity. What is Charge? The size of the current is the rate of flow of charge. Electrons are negatively charged particles which transfer energy through wires as electricity. Charge is measured in coulombs (C). Electrons are really small and the effect of one electron would be really difficult to measure, It is easier to measure the effect of a large number of electrons. One Coulomb of charge contains 6 × 1018 electrons. Charge equation To calculate Charge we use this equation. $Q = { \mathit I \, \mathit t}$ Charge demo In this tutorial you will learn how to calculate the the charge flowing in an electrical circuit. Chilled practice question Calculate the charge when a current of 16 A flows for 2 minutes. Frozen practice question How long must a current of 26 A flow to transfer 936 KC. Science in context The size of the current is the rate of flow of charge.

### Resistance

Resistance is an electrical quantity that measures how a device or material reduces the electrical current flow through it. What is Resistance? Resistance is an electrical quantity that measures how the device or material reduces the electrical current flow through it. Resistance is measured in ohms (Ω).If we make a comparison of resistance to water flow in pipes, the resistance is greater when the pipe is thinner, so the water flow is decreased It slows down which also happens to the flow of electricity. Resistance equation To calculate Resistance we write the equation like this. $V = { \mathit I \, \mathit R}$ Resistance demo In this tutorial you will learn how to calculate the resistance in an electrical circuit. Chilled practice question Calculate the resistance of a bulb supplied with 8 V and a current flow of 2 A. Frozen practice question Calculate the current in a circuit which has a resistance of 16 Ω and a potential difference of 8 V. Science in context Resistance reduces the flow of electricity.

### Resistance in Series and Parallel

Resistors in series and in parallel can change the total resistance in a circuit. What is Resistance in series and parallel? Resistors in series and in parallel change the total resistance in a circuit. Special components called resistors are made especially for creating a precise quantity of resistance in a circuit. They are generally made of metal wire or carbon and constructed to maintain a stable steady amount of resistance over a wide range of environmental conditions. Resistance in series and parallel equation To calculate Resistance in series we use this equation. $R_t = {\mathit R_1 \text + \mathit R_2}$ Resistance in series and parallel demo In this tutorial you will learn how to calculate the total resistance of resistors in series and parallel. Chilled practice question Calculate the current in a circuit if it is supplied with a voltage of 36 V and has two resistors in series one 6 Ω and the other 3 Ω. Frozen practice question Three resistors are connected in parallel, resistor A is 2 Ω , resistor B is 4 Ω, and resistor C is 5 Ω . What is the total resistance in the circuit ? Science in context Resistance in series and…

### Electrical Power

The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time at which electrical energy is transferred by an electric circuit. What is Electrical power? The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The unit for power is the watt, which is the transfer of energy at the rate of one joule per second. Electric power can be produced by electric generators and batteries. Electrical power equation To calculate Electrical power we use this equation. ${\mathit P \, \text = \mathit V \mathit I}$ Electrical power demo In this tutorial you will learn how to calculate the electrical power of an electrical appliance. Chilled practice question Calculate the power in a circuit when a p.d of 18 V and a current of 4 A is measured. Frozen practice question Find the current flowing through an appliance which has a power rating of 14 KW and a p.d of 230 V. Science in context The power of an appliance is the energy that is transferred per second

### Gravitational Potential Energy

Lifting an object in a gravitational field transfers energy into the objects gravitational energy store. Gravitational potential energy is the energy an object has due to its height above Earth. What is Gravitational potential energy? Lifting an object in a gravitational field transfers energy into the objects gravitational energy store. Gravitational potential energy is the energy an object has due to its height above Earth. The equation for gravitational potential energy is GPE = mgh, where m is the mass in kilograms, g is the gravitational field strength (9.8 N/Kg on Earth), and h is the height above the ground in meters. Gravitational potential energy equation To calculate Gravitational potential energy we use this equation. $E_p = mgh$ Gravitational potential energy demo In this tutorial you will learn how to calculate the energy stored in an elevated object. Chilled practice question Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam. Mark your solution and correct if needed. A barrel is lifted onto a shelf 3.5 m from the ground. The barrel has a mass of 22 Kg.…

### Efficiency

The efficiency of a device is the proportion of input energy that is converted to useful energy. What is Efficiency? The efficiency of a device is the proportion of input energy that is converted to useful energy. Efficiency is a measure of how much work or energy is conserved in an energy transfer, work or energy can be lost, for example as wasted heat energy. The efficiency is the useful energy output, divided by the total energy input, and can be given as a decimal always less than 1 or a percentage. No machine is 100% efficient. Efficiency equation To calculate Efficiency we use this equation. $efficiency = {\text{useful energy output} \over\text{total energy input}}$ Efficiency demo In this tutorial you will learn how to calculate how efficient a device is at transferring energy from one form to another. Chilled practice question Calculate the efficiency of a light bulb with a total input energy of 500 J. The bulb emits 200 J of light energy and 300 J of heat energy. Frozen practice question A tumble drier is 80% efficient. Its useful energy is 45 KJ what is the total input energy in Joules. Science in context The efficiency of a device is the proportion of…

### Energy Transformed

The potential difference between two points is the energy transferred per unit charge. An electrical circuit is an energy transformation device. What is Energy transformed? The potential difference between two points is the energy transferred per unit charge. An electrical circuit is an energy transformation device. Energy is provided to the circuit by an electrochemical cell, battery, generator or another electrical energy source. Energy is delivered by the circuit. The rate at which this energy transformation takes place has a great relevance to the design of an electrical circuit for useful functions. Energy transformed equation To calculate Energy transformed we use this equation. Energy = power x time ${\mathit E \, \text = \mathit P \mathit t}$ Energy = charge flow x potential difference ${\mathit E \, \text = \mathit Q \mathit V}$ Energy transformed demo In this tutorial you will learn how to calculate the energy transformed through an electrical circuit. Chilled practice question Calculate the energy transformed if a circuit is supplied with 6 V and 32 C of charge flows. Frozen practice question Calculate the energy transformed when a current of 4 A flows with a p.d of 230 V for 18 s. Science in…

### Forces and Work Done

The unit for work done is the joule (J), or Newton meter (N-m). One joule is equal to the amount of work that is done when 1 N of force moves an object over a distance of 1 m. Demo In this tutorial you will learn how to calculate the work done to move an object through a known distance. Note-Some mobile devices may require you to tap full screen during playback to view video content. The formula for this equation is written like this: w = f x d Chilled practice question Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam. Mark your solution and correct if needed. How much work has been done if a car is pushed along the road 550 cm with a force of 400 N ? Frozen practice question Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam.…

### Momentum

All moving objects have momentum. Forces can cause changes in momentum. The total momentum in a collision or explosion is conserved and stays the same. Car safety features absorb energy involved in a crash they slow down the collision thus reducing the force of impact. Demo In this tutorial you will learn how to calculate the momentum in a moving object. The equation is written like this: $P = { \text m\; \text x \; \text v}$ Chilled practice question Calculate the momentum of a 1200 Kg vehicle travelling at 5 m/s. Frozen practice question A girl has a mass of 60 Kg. How fast is she moving if her momentum is 240 Kgm/s ? Science in context All moving objects have momentum. Forces can cause changes in momentum. The total momentum in a collision or explosion is conserved and stays the same. Car safety features absorb energy involved in a crash they slow down the collision thus reducing the force of impact.

### Uniform Acceleration

Uniform or constant acceleration is a type of motion in which the velocity of an object changes by an equal amount in every equal time period. Demo In this tutorial you will learn how to calculate uniform acceleration. The equation is written like this: ${ \text v^{2} \; \text – \; \text u^{2} \; \text = \; \text 2as}$ Chilled practice question A racing car travelling at 20 m/s decelerates uniformly at 1.5 m/s2 towards a slip road 100 m away. Calculate its velocity when it reaches the slip road. Frozen practice question A ball is dropped 12 m from the top of a building. Calculate the velocity of the ball when it hits the ground. Ignore any value for air resistance. Acceleration due to gravity is 9.8m/s2 Science in context Uniform or constant acceleration is a type of motion in which the velocity of an object changes by an equal amount in every equal time period.

### Acceleration

Acceleration is how quickly the velocity is changing whether it be speed, direction or both. Acceleration is a measure of how quickly the velocity of an object is changing. Demo In this tutorial you will learn how to calculate the acceleration of a moving object. The equation is written like this: $a = { v \unicode{x2013} u \over \text{t}}$ Chilled practice question Calculate the acceleration if the velocity increases from 4 m/s to 76 m/s in 8 s. Frozen practice question How long does it take for the velocity of a bus to increase from 12 m/s to 20 m/s if it is accelerating at 4 m/s2. Science in context Acceleration is how quickly the velocity is changing whether it be speed, direction or both.

### Speed

Speed is how fast an object is moving in no given direction. Velocity is how fast an object is moving in a given direction. In physics, you can calculate the average speed by taking the total distance travelled and dividing it by the total time required to travel that distance. Demo In this tutorial you will learn how to calculate the speed of an object, velocity is speed with direction for example 20 m/s north. The equation is written like this: $S = { \text D / T}$ Chilled practice question Calculate the speed of a car which travels 2000 m in 400 s. Frozen practice question How long does it take a car to travel 360 m at 12 m/s ? Science in context Speed is how fast an object is moving in no given direction. Velocity is how fast an object is moving in a given direction.

### Weight on the Moon

Weight is the force acting on an object due to gravity. The weight of an object is defined as the force of gravity on the object and can be calculated as the mass times the acceleration due to gravity. Demo In this tutorial you will learn how to calculate the weight of an object on the moon due to its force of gravity. The equation is written like this: ${ \textit W} = {\text m \;} {\text x \;} {\text g}$ Chilled practice question Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam. Mark your solution and correct if needed. Calculate the weight of a flag pole on the moon, it has a mass of 5 Kg. Frozen practice question Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam. Mark your solution and correct if needed.…

### Weight on Earth

Weight is the force acting on an object due to gravity. The weight of an object can be defined as the force of gravity on the object. Since the weight is a force, its unit is the Newton. Demo In this tutorial you will learn how to calculate the weight of an object due to the force of the Earths gravity. The equation is written like this: ${ \textit W} = {\text m \;} {\text x \;} {\text g}$ Chilled practice question Calculate the weight of a bench on Earth which has a mass of 25 Kg. Frozen practice question Calculate the mass of an elephant if it has a weight of 60 KN on Earth. Science in context Weight is the force acting on an object due to gravity.
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