SP2h Braking distances and Energy

Question 1

Estimate the braking distance of a road vehicle given its mass, speed and braking
force

Answer 1

First you have to caluclate the kinetic energy by using:
1/2 x mass x velocity2, then use the equation
distance=work done/force.

Question 2

Explain what ‘work done’ means.

Answer 2

The amount of force needed to move an object at a certain distance.

Question 3

Calculate the work done when a force moves through a distance.

Answer 3

work done = force × distance.

Question 4

Describe the factors that affect the kinetic energy of a moving object.

Answer 4

Mass

Speed

Question 5

Calculate the kinetic energy of a moving

object.

Answer 5

1/2 x mass x velocity2