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WorksheetsEnergy Unit Review
Total questions: 24
Worksheet time: 18mins
A student is trying to build a device to keep food warm. She can use either wood or metal to build the device.
Which material will work best to prevent heat transfer by conduction?
wood because it blocks radiant heat
wood because it is an insulator
metal because it is a good conductor
metal because it blocks air flow
Students were asked to design a way to improve the efficiency of a simple machine.
What problem would they need to solve?
They need to find a way to increase the output work.
They need to find a way to reduce the friction.
They need to find a way to increase the input work.
They need to find a way to reduce the weight.
Sam picks up a cold piece of metal. His hand feels much colder.
What happens to the metal?
The temperature of the metal increases and the metal particles speed up.
The temperature of the metal decreases and the metal particles slow down.
The temperature of the metal increases and the metal particles slow down.
The temperature of the metal decreases and the metal particles speed up.
A student was designing a device to keep ice from melting.
Which of the following would work best to minimize heat transfer by radiation?
Make the container air tight to stop airflow.
Put it the sunlight to absorb more radiant heat.
Paint the device white to reflect radiant heat.
Put it on an insulated surface to prevent direct contact.
11. What causes a person's hand to become cold when they pick up a glass of ice water?
The heat energy would transfer from the glass to the person's hand.
The heat energy would transfer from the person's hand to the glass.
The cold would transfer from the glass to the person's hand.
The cold would transfer from the person's hand to the glass.
Anna was developing a model to explain how an electric motor works. She wants to describe what happens when electrical energy flows into the electric motor.
How could she best describe what happens?
Electric energy changes to chemical energy which makes the motor spin.
A magnetic field is produced by heat energy which makes the motor spin.
A magnetic field is produced around a coil of wire which makes the motor spin.
Electric energy changes to heat energy which makes the motor spin.
A student is developing a model to explain how an electric generator works.
Which of the following is a way to generate an electrical current?
Place a coil of wire in a magnetic field.
Heat a coil of wire with coal.
Insert a iron nail in a coil of wire.
Rotate a coil of wire in a magnetic field.
Tammy would like to improve the efficiency of her pulley system.
Which change would most likely improve the efficiency of her simple machine?
Use pulleys that are bigger around
Use more pulleys
Use a pulley that turns more easily
Use a longer rope
A group of students is asked to design and build a device which will keep ice from melting.
How could they best prevent heat from transferring to the ice by convection?
Paint it white to reflect radiation.
Fill in all cracks to prevent hot air from entering.
Use an insulator to prevent heat from entering.
Paint it black to absorb heat.
A student wants to model how energy is conserved. She holds a book above the floor and explains that the book now has potential energy. She then drops the book.
What energy transformation occurs after she drops the book?
It changes from potential to kinetic to elastic.
It changes from potential to kinetic to sound and thermal.
It changes from potential to kinetic to zero energy.
It changes from potential to kinetic and back to potential.
A student builds an electric circuit to play a radio. The circuit contains a radio, wires and a hand-held electric generator. When he turns the handle on the generator the radio begins to play.
Which of the following best explains how the radio gets the electric energy needed to produce sound energy?
The generator transforms potential energy into electric energy.
The generator transforms thermal energy into electric energy.
The generator transforms chemical energy into electric energy.
The generator transforms kinetic energy into electric energy.
A student is developing a model to help her explain convection. She wishes to draw a picture of how convection works.
Which of the following should she draw to help explain convection?
A pot heating up on top on a stove.
The sun warming the sand at the beach.
Cold air sinking pushing up warmer air.
A person touching a hot piece of metal.
Which of the following best describes a interrelationship between an electric motor and a generator?
Both have the ability to utilize source of energy that can destroy a magnetic field.
Both have a source of kinetic energy that transforms into electrical energy.
Both have the ability to utilize a source of energy that will create a magnetic field.
Both have a source of electrical energy that transforms into kinetic energy.
In an investigation, a ball was released from the three difference positions shown. The speed of the ball was measured at the bottom of the ramp, after the ball was released from each position.
Why was the speed greatest when the ball was released from the top position "1"?
The ball lost energy to the environment as it rolled down the ramp.
The ball had more potential energy at the top of the ramp.
The ball gained potential energy as it rolled down the ramp.
The ball had more kinetic energy at the top of the ramp.
A student wound up a propeller in the toy plane shown. After he wound it up, he let it go.
What energy transformation occurred when he released the propeller?
Gravitational potential energy transformed into kinetic energy.
Elastic potential energy transformed into kinetic energy.
Chemical kinetic energy transformed into spinning kinetic energy.
Elastic kinetic transformed into spinning kinetic energy.
Does all of the electrical energy produced by this battery transform into light energy?
Yes; because of the Law of Conservation of Energy.
No; because the mass of the battery changes.
Yes; because light bulbs are light producing devices.
No; because some of it transforms into heat energy.
A student measured the temperature of a beaker full of water. She then placed the beaker outside in the sun. She measured the temperature change and graphed the results as shown below.
What can you infer about the energy change that occurred?
chemical energy from the sun increased the thermal energy of the water
radiant energy from the sun decreased the thermal energy of the water
thermal energy from the sun decreased the chemical energy in the water bonds
radiant energy from the sun increased the thermal energy of the water
A student wants to change the simple machine shown below to lift the weight with less force.
Which of the following changes would most likely require less force to lift the weight?
use a fixed pulley
use a movable pulley
use a smaller pulley
use a larger pulley
The students pictured below were having difficulty getting their simple machine to work properly. They put oil on the fulcrum and it worked much better.
What improvement did they make to the machine?
They reduced the efficiency of the machine.
They increased the energy transferred to the environment.
They reduced the energy transferred to the environment.
They increased the work done by they machine.
The two pieces of fruit shown on the balance pan shown below were both lifted to a height of 6 feet.
At the height of 6 feet, which piece of fruit would contain the greater amount of gravitational potential energy?
The orange would contain greater gravitational potential energy because it would require more kinetic energy to lift it.
The apple would contain greater gravitational potential energy because it would require less force to lift it.
The apple would contain greater gravitational potential energy because more kinetic energy was used to lift it.
The orange would contain greater gravitational potential energy because its mass is greater than the apple.
Jack wants to help his friend lift a box using a board and a rock.
Where should Jack position the fulcrum in order to minimize the amount of force needed to lift the box?
Point A
Point B
Point C
Point D
Does the car have more potential mechanical energy at point B or D?
D, because the height is greater.
D, because it will be going faster.
B, because it will be going faster.
B, because the height is less.
A student did an investigation to find ways to decrease the force needed to pull a weight up the simple machine shown below.
What were the two methods she discovered to reduce the force?
Increase the length of the ramp.
Decrease the height of the ramp.
Decrease the length of the ramp.
Decrease the height of the ramp.
Increase the length of the ramp.
Increase the height of the ramp.
Decrease the length of the ramp.
Increase the height of the ramp.
A motor is spinning in the diagram below.
How does it get the energy to spin?
Stored electric energy transforms to chemical energy then into kinetic energy.
Stored chemical energy transforms into electric energy then into kinetic energy.
Stored heat energy transforms into electric energy then into kinetic energy.
Stored electric energy transforms into heat energy then into kinetic energy.
