Physics 2 Unit 3
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How is work calculated?
Work = Force x (distance in the direction of the force)

What is work measured in?
Work is measured in joules

How is power calculated?
Power = Energy ➗ time

What is meant by gravitational potential energy?
Gravitational potential energy is the energy stored in an object because of its position I'm a gravitational field

How is the change in gravitational potential energy calculated?
Ep = m x g x h
 Ep = change in gravitational potential energy /J
 m = mass /kg
 g = gravitational field strength per kilogram / N/Kg
 h = change in height in metres

How is kinetic energy calculated?
Ek = 1/2 x m x v" (squared)
 Ek = kinetic energy
 m = mass
 v = speed

How is momentum calculated?
P = m x v
 P = momentum kgm/s
 m = mass
 v = velocity

What is meant by the conservation momentum?
The total momentum before the interaction is equal to the total momentum afterwards  providing that no external forces act on them

What is the function of the crumple zone in cars?
Crumple zones in cars are designed to fold in a collision. This increases the impact time and so reduced the force on the car and people in it