Welcome to the Quiz!
This quiz contains 15 questions from a mix of 1 subtopics.
What is the formula used to calculate work done?
W = F x d
W = F - d
W = F + d
W = F รท d
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What are the units for work?
joules
meters
newtons
watts
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Which of the following criteria must be met for work to be done?
the object must reach a high velocity
a component of force must act in the direction of motion
the force must be constant
the object must accelerate
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How is power calculated?
power = work รท time
power = work x time
power = force รท velocity
power = force x time
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What are the SI units of power?
newton meters (Nm)
watts (W)
joules per second (J/s)
joules (J)
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Increasing velocity while force stays constant results in:
increasing power
unchanged power
zero power
decreasing power
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Which formula relates power, force and velocity?
P = F + v
P = F - v
P = F รท v
P = F x v
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The velocity of a car increases from 10 m/s to 20 m/s while the driving force remains at 100 N. How does the power change?
it remains the same
it doubles
it quadruples
it decreases to 1/4 of original
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A machine lifts a 50 kg mass 10 meters high in 5 seconds. What is its power output? (g=10 m/s2)
10 W
100 W
1,000 W
500 W
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What is defined as rate of energy transfer in physics?
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Give three scenarios where work is said to be zero according to the definition of work.
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A cyclist exerts a constant force of 200 N to move his bicycle 50 m forward in a straight line. How much work is done by the cyclist? You may ignore the effects of air resistance.
10,000 J
5,000 J
500 J
1,000 J
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How much power is needed to lift a 200 kg object 10 m high in 5 seconds, assuming gravity is 9.81 m s-2?
3,924 W
423 W
2,567 W
980 W
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A machine does 1,500 J of work in 3 seconds. What is the power of the machine?
5,000 W
1,500 W
4,500 W
500 W
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A force of 50 N is applied to push a box 20 m across the floor in 10 seconds. What is the power exerted in doing so?
100 W
50 W
10 W
5 W
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