Energy Transfers and Transformations

A student pulls the string on a bow to different distances and shoots an arrow. The student records the time the arrow takes to hit a target. What is the relationship between the speed of the arrow and its energy?

• The arrow moves fastest and has the most energy when the string stretches to 9 cm.

• The arrow moves slowest and has the most energy when the string stretches to 5 cm.

• The arrow moves slowest and has the least energy when the string stretches to 9 cm.

• The arrow moves fastest and has the least energy when the string stretches to 5 cm.

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Which two ways will decrease the kinetic energy of a car?

• when the car speeds up

• when the car slows down

• when the car drives north

• when the car stops at a traffic light

• when the car has its headlights turned on

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The image shows a simple electric circuit. What is the object in the circuit that changes electrical energy to light energy?

• 
• 
• 
• 

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Choose all of the forms of energy that can travel through a vacuum.

• chemical

• light

• mechanical

• solar

• thermal

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A glass beaker filled with water was placed on a window sill that receives direct sunlight. The water in the beaker became warmer over time. What energy transformation occurred as the water warmed?

• thermal energy into electrical energy

• radiant energy into thermal energy

• mechanical energy into light energy

• electrical energy into thermal energy

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As Bobby entered a dark room, he pushed the switch on the wall to turn on the light. What makes the light turn on when Bobby pushes the switch?

• electricity

• friction

• gravity

• magnetism

What conditions are necessary for heat conduction to occur between two objects?

• The objects must be surrounded by air or water.

• Two objects at different temperatures are touching one another.

• Two objects at different temperatures are located close to one another.

• One object must emit energy as light and heat and another object absorbs the energy.

This car bumped into a tree and the metal bent. Where did the energy that bent the metal come from?

• energy stored in the metal

• energy stored in the tree

• energy from the movement of the car

• energy from the surface of the road

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When the drummer hits the cymbal, it makes a loud sound. Where does the energy that causes the sound come from?

• the moving drumstick

• the metal of the cymbal

• the air around the cymbal

• the ear of the person hearing the sound

What will most likely happen to Marble A at the bottom of Jackie's track in Figure 2 when the moving marble hits it?

• It will stay in place.

• It will stop the other marble.

• It will break into small pieces.

• It will move away from the track.

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