# AQA Physics P2.2

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 Author: BMH ID: 298328 Filename: AQA Physics P2.2 Updated: 2015-03-13 14:05:25 Tags: AQA Physics P2 Folders: Description: AQA Physics P2.2 Show Answers:

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1. How do you calculate the work done by moving an object through a distance?
Work = Force x distance
2. What is the unit of energy?
JouleĀ (J)
3. What name do we give to how quickly energy is transferred?
Power
4. What is the standard unit of time?
SecondĀ (s)
5. What is the unit of power?
• Watt (W)
• (1 Watt = 1 Joule per second)
6. What affects an object's Gravitational Potential Energy?
• Its height from the ground,
• mass
• the strength of gravity
7. What affects an objects kinetic energy the most?
Velocity

• since
• (doubling the velocity quadruples the KE)
8. What is the standard unit for mass?
KilogramsĀ (kg)
9. How is the momentum of an object calculated?
Mass x velocity
10. What is the difference between speed and velocity?
• Speed just has a size.
• Velocity has a size and a direction (a vector)
11. What does conservation of momentum mean?
In a closed system, the total momentum before an event is equal to the total momentum after the event
12. When an object is lifted up, what type of energy is it given?
Gravitational Potential Energy (GPE)
13. What name is given to the energy of a moving object?
Kinetic Energy (KE)
14. When an object falls from a height, what energy transfer takes place?
GravitationalPotential Energy (GPE) is converted to Kinetic Energy (KE)
15. When a vehicle brakes and slows down, what has happened to the lost Kinetic Energy?
It has been converted to thermal energy (heat) in the brakes and is dissipated (lost to the surroundings)

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