OCR physics B21C – P2
Gas Pressure is created when gas particles collide with the walls of their container. The more often the particles collide with the walls, and the faster …
Forces can cause an object to rotate and the turning effect of the force is called a moment. If a resultant force acts on an object about a …
When a force acts on a spring it is stretched or compressed, its length will changes by an amount e from its original length. …
Pressure can be calculated if you know the force applied to or by an object and the contact area. The units are newtons per square …
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 …
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 …
Specific heat capacity is how much heat energy is required to raise 1 kg of a substance by 1 °C.
What is Specific heat capacity?
Specific …
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 …
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 …
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 …
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 …
The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time at which electrical …
Density is a measure of how compact the particles are in a substance. Density is defined as the mass per unit volume.
What is Density
Density is …
Specific latent heat is the energy needed to change the state of a substance.
What is Specific latent heat?
Specific latent heat is the energy needed …
The radioactivity of a sample decreases over time. Half life is a measurement of this decrease.
What is Half life?
The radioactivity of a sample decreases …
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 …
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 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 …
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 …
All moving objects have momentum. Forces can cause changes in momentum. The total momentum in a collision or explosion is conserved and stays the …
A transformer is an piece of electrical apparatus which will increase or decrease the voltage in an alternating current. It can be designed to “step up” …
A current-carrying wire or coil can exert a force on a permanent magnet. The force increases if the strength of the magnetic field and/or current increases. This is …
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 …
Fluid pressure is exerted on the surface of an object in a liquid. This pressure causes upthrust . An object placed in a liquid will begin to sink. …
Acceleration is how quickly the velocity is changing whether it be speed, direction or both. Acceleration is a measure of how quickly the velocity …
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 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 …
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 …
