# edexcel-combined-1-and-9-paper-5-solution

## Kinetic Energy

In physics, the ** kinetic energy (KE)** of an object is the

*that it has due to its motion. It is*

**energy***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

*that it has due to its motion. It is*

**energy***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 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 meteorite has 8000 **J** of **Kinetic energy**, calculate its **mass** if it has a **velocity** of 20 **m/s**

## Science in context

Anything that is moving has energy in its** kinetic energy store**.

## Millie’s Master Methods

## The Fridge Physics Store

## 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/s ^{2}** 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 9.8**m/s ^{2}**

## 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.