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A battery and a candle are similar because
If you bend a piece of aluminum wire back and forth very rapidly for one minute, there is friction of the atoms of the wire as they are forced to move over and under one another. Which of the following best explains the energy change?
What are the energy transformations involved in a hydroelectric power plant? (In the correct order)
A boy throws a ball vertically upward into the air. Which of the following is TRUE before the ball hits the ground?
Which of the following has kinetic energy?
A flashlight runs on a battery. If the light is left on, the battery runs out and the flashlight stops working. Which statement best describes what has happened to the battery’s energy?
Which of the following statements about energy is true?
I. Plants get their energy from the soil.
II. Animals get their energy form the food they eat.
III. Cow and horse get their energy form the grass they eat.
IV. Birds get their energy from the wind when they fly.
The diagram below shows a ball being kicked by a boy.
Which of the following statements are true?
I. When the boy moves his leg, the chemical energy in his body is transferred to the ball.
II. When the boy moves his leg, the chemical energy in his leg is converted to kinetic energy
III. The chemical energy in the ball is converted to kinetic energy.
IV. The kinetic energy is transferred from the boy’s leg to the ball.
Which of the following possesses chemical energy?
I. A piece of charcoal
II. A bag of rice
III. A battery
IV. A wound-up spring in a toy car
Study the diagram below and use it to answer Questions 10 and 11.
A toy car is put on top of a ramp. Before it moves down, what kind of energy does it have?
When the toy car is moving down the ramp, the____________
Study the diagram below which shows a doorbell.
What form of energy will cause the doorbell to ring when the button is pressed?
The table below shows how electrical energy is converted to other forms of energy by some appliances when they are working. Which of the following is arranged correctly?
A can is placed in the path of a pendulum which is released from rest. The can is knocked over by the pendulum eventually. Which of the following shows the correct energy conversion that is taking place?
The wind is a source of energy because
I. It is moving air and has kinetic energy
II. Its kinetic energy can be used to spin the blades of the wind turbine to generate electricity.
III. Its kinetic energy can be used to pump water and grind grains.
Energy is transformed when it is transferred from one medium to another, as shown in the following:
Which of the following devices best represents the energy transformation shown above?
A round ball X was rolled across a smooth floor to collide with a similar Y that was stationary. Which of the following is most likely to happen?
Electrical energy is used to power a lamp. If the lamp is 90% efficient, the amount of light energy produced is _____________ the amount of electrical energy used.
In water bodies, pressure increases as depth increases. Fish are not affected by changes in pressure. They are able to swim upward or downward in the water because they have a “swim bladder,” a sac-like structure that holds air. How do fish use their “swim bladder” ?
Divers need to understand that the deeper the water gets, the higher is the pressure. If they return to the surface too quickly, without any protective instrument, they can suffer from decompression sickness, also known as “the bends”. What happens here?