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WorksheetsWORK, ENERGY & POWER
Total questions: 10
Worksheet time: 10mins
1. If a system is isolated, the total energy of the system
Increases constantly.
Is constant.
Decreases constantly.
Depends on the work done on the system.
Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?
A
C
E
B
D
Rank in order, from largest to smallest, the gravitational potential energies of the balls.
1 > 2 = 4 > 3
3 > 2 = 4 > 1
1 > 2 > 3 > 4
3 > 2 > 4 > 1
Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?
Faster at the bottom of the steeper hill
Faster at the bottom of the less steep hill
Same speed at the bottom of both hills
Can’t say without knowing the mass of the marble
A small child slides down the four frictionless slides A–D. Rank in order, from largest to smallest, her speeds at the bottom.
vD > vA > vB > vC
vC > vA > vB > vD
vD > vA = vB > vC
vA = vB = vC = vD
Four students run up the stairs in the time shown. Which student has the largest power output?
A
B
C
D
Which requires more work – a person walking up stairs or a person running up stairs?
walking
they require equal work
running
no work is required for either because the movement is vertical
Which requires more power – a person walking up stairs or a person running up stairs?
walking
running
they require equal power output
no power is required at all
A basketball that is dropped bounces back up to its original height. Pick the correct energy transformation from the point when it was dropped until it returns to the original height.
KE --> PE --> Elastic
KE --> PE --> Elastic --> PE --> KE
PE --> KE --> Elastic --> KE --> PE
Elastic --> PE --> KE --> Elastic
How does conservation of energy explain why something that is falling should speed up?
It gains kinetic energy because it gains potential energy.
It loses kinetic energy because no work was done on it.
It gains kinetic energy because it loses potential energy.
It loses kinetic energy because the Earth gains potential energy.
