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Sec 2 Revision on Work, Energy and Power
Quiz by Soon Lee Tan
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​The following girls (A, B, C and D) try to lift a bucket from the bottom of a well.
Which girl does the most work?
AÂ Â using a rope with an empty bucket
BÂ Â using a rope with a full bucket
CÂ Â using double length of a rope with an empty bucket
DÂ Â using double length of a rope with a full bucket
A
C
B
D
Which is a unit of power?
Â
AÂ Â Â Â Â Â Â joule
BÂ Â Â Â Â Â Â kilogram
CÂ Â Â Â Â Â Â newton
D       watt   Â
The following girls (A, B, C and D) try to lift a bucket from the bottom of a well.
Which girl does the most work?
AÂ Â using a rope with an empty bucket
BÂ Â using a rope with a full bucket
CÂ Â using double length of a rope with an empty bucket
DÂ Â using double length of a rope with a full bucket
A scooter is travelling along a horizontal road at a steady speed. The brakes are applied and the scooter comes to a stop.
Which statement describes the energy change which takes place during the braking?
Â
AÂ Â Â Â Â Â Â Potential energy is converted to kinetic energy.
BÂ Â Â Â Â Â Â Potential energy is converted to heat energy.
CÂ Â Â Â Â Â Â Kinetic energy is converted to heat energy.
DÂ Â Â Â Â Â Â Kinetic energy is converted to potential energy.
Tom and Jerry run up a hill in the same time. Tom weighs more than Jerry.
Which statement is true about the power produced?
Â
AÂ Â Â Â Â Â Â It is impossible to tell who produces more power.
BÂ Â Â Â Tom produces more power.
CÂ Â Â Â Â Â Â Jerry produces more power.
DÂ Â Â Â Â Â Â They both produce the same power.
A man standing 0.2 m away from a wall pushes with a force of 45 N. The wall does not move.
What work is done on the wall by the man?
Â
AÂ Â Â Â Â Â Â 0 J
BÂ Â Â Â Â Â Â 0.9 J
CÂ Â Â Â Â Â Â 9 J
DÂ Â Â Â Â Â Â 90 JÂ Â Â