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3.1
3.2
100
list three ways you use energy.
What is television, food, riding a bike
100
Describe an energy conversion you have observed in your own life.
What is riding a bike, eating an apple
200
what are two factors that determine an object's kinetic energy?
What is mass and speed
200
Explain the law of conservation in your own words.
What is energy can change forms, but the overall amount of energy is constant.
300
How do the different forms of potential energy depend on an object's position or chemical composition?
What is an object's position above ground; chemical potential depends on the atoms and bonds in an object.
300
Give an example of an energy conversion that produces unwanted forms of energy.
What is light bulbs release heat in addition to light.
400
What forms of potential energy would be found in an apple on the branch of a tree?
What is Gravitational; because of the apple's position; chemical, because the apple can be eaten for chemical energy
400
Suppose you are jumping on a trampoline. Describe the conversions that occur between kinetic energy and potential energy.
What is potential energy is greatest at the highest point. Potential energy converts into kinetic energy until hitting the trampoline. Kinetic energy converts to potential energy in the trampoline to the lowest point, and is converted to kinetic energy back into the air.
500
Describe a stone falling off a tabletop in terms of both kinetic energy and potential energy
What is the stone has potential energy due to gravity. The amount of energy depends on its mass and height. The greater its potential energy, the greater the kinetic energy when it falls.
500
Look at the ski jumper on page 79. Has all of his potential energy been changed into kinetic energy at the moment he lands? Explain.
What is No; some energy changed into heat and sound.