P3 - Energy on the move

Question 1

What does the amount of kinetic energy depend on?

Answer 1

• its mass

- its speed

Question 2

What are the units for KE?

Answer 2

Joules (J).

Question 3

What is the formula for kinetic energy?

Answer 3

1/2mv^2

half x mass x velocity squared

Question 4

A car has a mass of 1200Kg. Calculate its kinetic energy when traveling at 10m/s.

Answer 4

KE = 1/2mv^2

0.5 x 1200 x 100 = 60000J

Question 5

What do we need to rely on if fossil fuels run out?

Answer 5

• bio fueled vehicles
• solar powered vehicles
• electric vehicles

Question 6

What happens when the speed of the car doubles to kinetic energy and breaking distance?

Answer 6

• the breaking distance quadruples

- the kinetic energy quadruples

Question 7

How can something become more streamlined?

Answer 7

• shape a car roof box
• making a high speed car a wedge like shape
• angling lorry deflectors

Question 8

What does being streamlined do?

Answer 8

Being streamlined increases a cars top speed and decreases fuel consumption.

Question 9

What are the issues associated with battery driven cars?

Answer 9

• batteries take up a lot of space
• the batteries need recharging frequently
• the car is expensive to buy

Question 10

What are the issues with solar powered cars?

Answer 10

• the sun is not always shining

- there is no back up of a battery

Question 11

What are the factors that affect the fuel consumption of a car?

Answer 11

• the amount of energy required to increase its KE
• the amount of energy required for it to do work against friction
• its speed
• road conditions