Lesson 2: Conservation of Energy Answers
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1
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Which energy transformations occur when a candle burns?
A
Thermal energy transforms into mechanical energy and radiant energy.B
Chemical energy transforms into thermal energy and electrical energy.C
Thermal energy transforms into radiant energy and chemical energy.D
Chemical energy transforms into thermal energy and radiant energy.2
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Which of these changes would make the diagram error-free? Check all that apply.
A
reducing the amount of thermal energy to 475 JB
increasing the amount of electrical energy to 825 JC
increasing the amount of sound energy to 225 JD
reducing the amount of kinetic energy to 50 JE
reducing the amount of electrical energy to 675 J3
If no energy is lost due to friction, which statements about the energy of the ball are true? Check all that apply.
A
The potential energy at the top of the ball’s motion is 18 J.B
The kinetic energy is less when the ball is thrown than when it is caught.C
The kinetic energy increases as the potential energy decreases.D
The kinetic energy decreases as the potential energy increases.E
The total mechanical energy of the ball stays constant.F
The mechanical energy decreases as the ball moves up and increases as the ball comes down.4
Which best describes how energy changes form in a car’s engine?
A
A single transformation occurs because the chemical energy of the fuel is changed to the mechanical energy of the car.B
A single transformation occurs because the mechanical energy of the car originates from one spark.C
Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy.D
Multiple transformations occur because the chemical energy of the fuel must be replenished to keep the car running.5
The image shows a pendulum that is released from rest at point A.
A
A: Maximum kinetic energyC: Maximum gravitational potential energyB
B: Maximum kinetic energyD: Maximum gravitational potential energyC
A: Maximum gravitational potential energyC: Maximum kinetic energyD
B: Maximum gravitational potential energyD: Maximum kinetic energy6
Which statement best describes what energy transfer diagrams show?
A
Energy can change form, but the total amount of energy stays the same.B
Every energy transformation results in a reduction of energy.C
Energy transformations result in fewer types of energy.D
Each type of energy can change into one other type of energy.7
The image shows a pendulum that is released from rest at point A. Shari tells her friend that no energy transformation occurs as the pendulum swings between point B and point D.
A
She could agree with Shari because the pendulum is at the same height and would have the same gravitational potential energy at both positions.B
She could agree with Shari because the pendulum has the same amount of mechanical energy throughout its swing.C
She could disagree with Shari because the pendulum converts kinetic energy into gravitational potential energy, then back into kinetic energy.D
She could disagree with Shari because the pendulum converts gravitational potential energy into kinetic energy, then back into gravitational potential energy.9
What energy transformation occurs when a skydiver first jumps from a plane?
A
Gravitational potential energy transforms into kinetic energy.B
Gravitational potential energy transforms into thermal energy.C
Kinetic energy transforms into gravitational potential energy.D
Thermal energy transforms into gravitational potential energy.Did you find these answers helpful?
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