Work And Energy

Question 1

What is the equation for work ?

Answer 1

Work = force x distance moved
W = fd

Question 2

Unit for energy ?

Answer 2

Joules (J)

Question 3

How to calculate energy ?

Answer 3

Kinetics energy = mass x velocity²
2

Question 4

What is the equation for gravitational potential energy ?

Answer 4

GPE = mass x gravitation field strength x change in height

Question 5

How do you calculate energy stored in a spring ?

Answer 5

Area under force extension graph

Question 6

Car safety features

Answer 6

Air Bags
Crumple Zones

Question 7

How do car safety features work ?

Answer 7

Reduces kinetic energy of passengers to be done over a longer distance.

The longer the distance the work is done over, the smaller the force/impact on passengers will be

Question 8

Why do cars need to be streamlined ?

Answer 8

Reduces the work done by frictional forces on the car

Question 9

How do you calculate force on a spring ?

Answer 9

Force = spring constant x extension