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WorksheetsWork, energy and power
Total questions: 20
Worksheet time: 47mins
Which energy resource is not renewable?
geothermal
nuclear
solar
wind
The diagram shows part of a rollercoaster ride with the car at different positions. The car runs freely down from position X to position Y and up the hill on the other side.
What happens to the kinetic energy and to the gravitational potential energy of the car as it moves from position X to position Y?
K.E = decreases, G.P.E = decreases
K.E = decreases, G.P.E = increases
K.E = increases, G.P.E = decreases
K.E = increases, G.P.E = increases
Student P uses a force of 35 N to push a box 3.0 m across the floor. Student Q uses a force of 22 N to push another box 1.8 m across the floor. Which statement gives a full explanation why student P uses more energy than student Q?
Student P pushes his box a greater distance than student Q.
Student P pushes his box a greater distance and uses a bigger force than student Q
Student P uses a bigger force than student Q.
Student P pushes a heavier box than student Q.
The escalator takes 20 seconds to carry the man between the two floors. The useful work done against gravity is W. The useful power developed is P. The lift takes 30 seconds to carry the same man between the same two floors. How much useful work against gravity is done by the lift, and how much useful power is developed by the lift?
work done by lift = more than W, useful power by lift = less than P
work done by lift = more than W, useful power by lift = P
work done by lift = W, useful power by lift = less than P
work done by lift = W, useful power by lift = P
Which energy resource stores kinetic energy?
nuclear
wind
coal
solar
Two workers are stacking cans on to a shelf in a shop. The workers lift the same number of identical cans on to the same shelf from the same level. Worker P takes 3.0 minutes to lift the cans. Worker Q takes 4.0 minutes to lift the cans. Which statement about the workers is correct?
Worker P develops less useful power than worker Q
Worker P develops more useful power than worker Q
Worker P does less useful work than worker Q.
Worker P does more useful work than worker Q.
What needs to be known to calculate the work done by a force acting on an object?
A
B
C
D
A box of mass m and weight W is carried up some stairs of total height x and total width y. On which quantities does the work done against gravity on the box depend?
m and y
W and x
W and y
x and y
Which row gives the energy change in a battery and the energy change in a solar cell?
battery = chemical to electrical, solar cell = electrical to light
battery = chemical to electrical, solar cell = light to electrical
battery = electrical to chemical, solar cell = electrical to light
battery = electrical to chemical, solar cell = light to electrical
Which movement will require the greatest amount of work to be done?
a force of 10N moving an object a distance of 3.0m
a force of 10N moving an object a distance of 5.0m
a force of 15N moving an object a distance of 3.0m
a force of 15N moving an object a distance of 5.0m
A lorry of mass 4000kg is travelling at a speed of 4.0m/ s. A car has a mass of 1000kg. The kinetic energy of the car is equal to the kinetic energy of the lorry. What is the speed of the car?
2.0 m/s
4.0 m/s
8.0 m/s
16.0 m/s
A weight-lifter raises a 2000N weight through a vertical height of 2.0m in 0.80s. What useful power does he develop in doing this?
800 W
3200 W
4000 W
5000 W
A ball is dropped on to a hard surface and bounces. It does not bounce all the way back to where it started, so it has less gravitational potential energy than when it started. What happens to the ‘lost’ energy?
It is converted into chemical and strain energy.
It is converted into internal (heat) energy and sound.
It is destroyed as the ball rises upwards after hitting the ground.
It is destroyed when the ball hits the ground.
What is the unit of thermal energy?
W
Pa
N
J
Three situations are listed.
(1) someone blowing air into a party balloon
(2) a crane lifting a block of concrete
(3) a pile of books at rest on a shelf
In which situations is work being done?
1 only
1 and 2 only
2 and 3 only
1, 2 and 3
Brakes are used to slow down a moving car. Into which form of energy is most of the kinetic energy converted as the car slows down?
sound
elastic potential
chemical
thermal
The power output from solar panels is recorded every day for a month. The graph shows the output recorded. Which conclusion can be drawn from this graph?
The power output from the solar panels changes from day to day.
The power output from the solar panels is cheap to produce.
Solar panels create no pollution
Solar energy is renewable.
A man carries 20 tiles from the ground to the roof of a house. Each tile has a mass of 1.2 kg. The roof of the house is 15 m above the ground. How much work does the man do against gravity on the tiles in carrying them to the roof?
36 J
180 J
360 J
3600 J
An object is lifted vertically by a motor. In which example is the power produced the greatest?
lifting it a shorter distance in a longer time
lifting it the same distance in a shorter time
lifting it a shorter distance in the same time
lifting it the same distance in a longer time
A person in a factory has to lift a box on to a shelf. Which action involves the person doing the least amount of work?
lifting the box quickly to the high shelf
lifting the box slowly to the high shelf
lifting the box to the low shelf instead of to the high shelf
lifting the box to the low shelf first then lifting it to the high shelf
