Fall Semester Review

Front

The ____ energy of an object increases with its height.

Back

gravitational potential

Answer explanation

The gravitational potential energy of an object increases with its height due to the work done against gravity. As an object is raised, it gains energy relative to a reference point, making 'gravitational potential' the correct choice.

Front

An object that has kinetic energy must be: lifted above Earth’s surface, in motion, at rest, changing direction

Back

in motion

Answer explanation

An object that has kinetic energy is defined as being in motion. Kinetic energy is the energy of an object due to its movement, so the correct answer is 'in motion'. The other options do not apply.

Front

The law of ____ states that energy in a system can change forms but can never be created or destroyed.

Back

conservation of energy

Answer explanation

The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another. This makes 'conservation of energy' the correct choice, as the other options do not accurately describe this principle.

Front

The kinetic energy of an object increases as its _______ increases.

Back

speed

Answer explanation

The kinetic energy of an object is directly related to its speed, as it is calculated using the formula KE = 1/2 mv². Therefore, as the speed of an object increases, its kinetic energy also increases.

Front

Heat energy will normally flow from which location in a temperature field?

Back

C to B

Answer explanation

Heat energy flows from higher to lower temperatures. If C has a higher temperature than B, heat will flow from C to B, making 'C to B' the correct choice.

Front

Energy stored in food would be considered

Back

chemical potential

Answer explanation

Energy stored in food is a form of chemical potential energy, as it is stored in the bonds of molecules. When consumed, this energy can be released and used by the body, distinguishing it from kinetic, thermal, or gravitational potential energy.

Front

Conduction is the transfer of heat energy by

Back

direct particle contact

Answer explanation

Conduction is the transfer of heat energy through direct particle contact, where vibrating particles transfer energy to neighboring particles. This distinguishes it from other methods like radiation or convection.

Front

An example of an energy conversion from kinetic to thermal energy would be

Back

friction

Answer explanation

Friction is the resistance that occurs when two surfaces slide against each other, converting kinetic energy (motion) into thermal energy (heat). This makes friction the correct example of kinetic to thermal energy conversion.

Front

Green plants convert light energy from the sun into ____ during photosynthesis.

Back

chemical potential energy

Answer explanation

Green plants convert light energy into chemical potential energy during photosynthesis. This energy is stored in the form of glucose, which can be used by the plant for growth and metabolism.

Front

A constant force of 2.0 N is used to push a box 4.0 m across the floor. How much work is done?

Back

8 J

Answer explanation

Work is calculated using the formula: Work = Force × Distance. Here, Work = 2.0 N × 4.0 m = 8 J. Therefore, the correct answer is 8 J.