Download P2.4 Energy and momentum

P2 Forces and energy Revision Sheet
1. What is the type of energy for objects that are
Kinetic energy
moving? [1]
2. What does momentum depend on? [2]
 Mass
 Velocity
3. What does Work done depend on? [2]
 The size of the force moved
 The distance the force is
moved
4. What is Power? [1]
The rate of which work is done.
5. How do you calculate power? [1]
Power = energy transferred / time
6. What form of energy depends on how high
the object is? [1]
Gravitational potential energy
7. What is the unit of power? [1]
Watt
8. What is the unit of energy? [1]
Joule
9. What is the unit of work done? [1]
Joule
10.What is conservation of momentum? [1]
Momentum before = momentum
after
11.What is Kg m/s a unit for? [1]
Unit of momentum
12.What is the equation to calculate
momentum?
P=mv
Where P is momentum
m is mass
v is velocity
13.State the energy changes of a falling ball from
when it drops, to when it lands on the floor
[5]





Gravitational potential energy
Kinetic energy
Elastic energy
Sound energy
Heat energy

14.What is the equation for calculating kinetic
energy? [3]
Kinetic energy = ½ m v2
 Where m is mass
 V is velocity
15.What kinetic energy does a stationary car
have?
 None – it is not moving
16.What is more gravitational potential energy –
a book on the floor or a book on a table?
 The one on the table because
it is higher
17. What does kinetic energy depend on? [2]
 Speed of the object
 Mass of the object
18. What is the equation used to calculate
gravitational potential energy? [4]
19. An object is lifted 10m by a force of 45N.
How much work is done to lift the object? [1]
20. A device transfers 500J of energy in 10
seconds. What is the power of the device?
[1]
21. If 600J of work are done in 100 seconds
what is the power? [1]
22.A van is moving at 6m/s. The van has a mass
of 100kg. Calculate the van’s momentum [1]
23. The total momentum after 2 cars collide is
199kg m/s. State the momentum before the
collision. [1]
24.The momentum of a gun containing a bullet
is A 30kg m/s. When the gun has fired, the
gun’s momentum is 20kg m/s. Calculate the
momentum of the bullet [1]
25.It takes 2 minutes to lift an 8kg object 7m
into the air. Calculate the power of the
lifting device and the gravitational potential
energy of the object when it has been lifted.
[1]
26.A fish of 1kg mass is moving at 3m/s.
Calculate the kinetic energy of the fish [1]
27.A person is 60kg and is lifted 2m up from the
ground. Calculate the gravitational potential
energy . [1]
Ep = mgh
m = mass
g = gravitational field strength
h = change in height