# Physics 2 Unit 3

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1. How is work calculated?
Work = Force x (distance in the direction of the force)
2. What is work measured in?
Work is measured in joules
3. How is power calculated?
Power = Energy ➗ time
4. 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
5. 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
6. How is kinetic energy calculated?
Ek = 1/2 x m x v" (squared)

• Ek = kinetic energy
• m = mass
• v = speed
7. How is momentum calculated?
P = m x v

• P = momentum kgm/s
• m = mass
• v = velocity
8. 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
9. 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
 Author: Rvynvega ID: 219081 Card Set: Physics 2 Unit 3 Updated: 2013-05-11 18:12:59 Tags: triple Folders: Description: Work Energy Momentum Show Answers: