1. This document contains a marking scheme for a worksheet with 9 multiple choice and calculation questions. 2. Question 6 calculates the kinetic energy of a meteor and jogger, finding the meteor has greater kinetic energy. 3. Question 7 calculates the gravitational potential energy and power of lifting an object. 4. Question 8 considers the conservation of energy during the bounce of a ball, calculating velocities and energy transfers. 5. Question 9 calculates gravitational potential energy and velocity for a hanging object.

1. 5 Marking scheme: Worksheet (AS)
1 C [1]
2 D [1]
3 C [1]
4 A [1]
5 D [1]
1 2 1
6 Meteor: Ek mv 0.010 50002 1.3 105 J [1]
2 2
1 2 1
Jogger: Ek mv 65 5.0 2 810 J [1]
2 2
The meteor has greater kinetic energy than the jogger. [1]
7 a Ep mgh
Ep 9.0 9.81 3.5 [1]
Ep 309 J 310 J [1]
W
b P
t
309
P [1]
60
P 5.2 W [1]
8 a Using the principle of conservation of energy:
final kinetic energy loss of gravitational potential energy
final kinetic energy mgh 0.800 9.81 5.0 [1]
final kinetic energy 39.2 J 39 J [1]
b Maximum gravitational energy after bounce 0.800 9.81 3.8 29.8 J [1]
Kinetic energy just after rebound 29.8 J
1
0.800 v 2 29.8 [1]
2
2 29.8
v 8.6 m s 1 [1]
0.800
c Energy transfer to ground 39.2 29.8 = 9.4 J [1]
9 a Ep mgh
Ep 35 9.81 (1.5 0.80) [1]
Ep 240 J [1]
1 2
b mv mgh
2
v2 2gh 2 9.81 (1.5 0.80) [1]
1
v 3.7 m s [1]
c There is no distance moved in the direction of the tension in the rope, since the motion is
always at right angles to the rope. Hence, no work is done by the tension. [1]
AS and A Level Physics Original material © Cambridge University Press 2010 1

2. 5 Marking scheme: Worksheet (AS)
AS and A Level Physics Original material © Cambridge University Press 2010 2