REVIEW: UNIT 3 ASSESSMENT

Daniel and Robert went rowing. While Robert was rowing at a speed of 8 km/h, Daniel was rowing at a speed of 10 km/h in the opposite direction. If the masses of the boats and their rowers are equal, which of the following is a true statement about their kinetic energies?

• Robert has more kinetic energy than Daniel.

• Daniel has more kinetic energy than Robert.

• Only Daniel has kinetic energy because his energy cancels out Robert’s.

• Only Robert has kinetic energy because he is rowing in the forward direction.

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A fan pushes hot air out of a vent and into a room. The hot air displaces cold air in the room, causing the cold air to move closer to the floor. The hot air displacing the cold air is an example of _____ .

• evaporation

• radiation

• conduction

• convection

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Sam is about to drop a golf ball from his hand. As the ball falls, its ______ energy will decrease and its ______ energy will increase.

• Potential, Kinetic

• Kinetic, Potential

• Thermal, Chemical

• Chemical, Thermal

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Steve, Mary, Annie, and James hit four identical tennis balls with a racket. The diagram below shows the top speed at which each tennis ball moved when it was hit.

• Steve's ball had the most kinetic energy.

• Annie's ball had the most kinetic energy.

• James's ball had the most kinetic energy.

• Mary's ball had the most kinetic energy.

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Mario brings his hands near a fire and feels its warmth. If the air around Mario's fireplace is still, most of the heat is reaching his hands through _______.

• condensation

• convection

• radiation

• conduction

Jimmy held the end of a metal bar over a fire while holding on to the opposite end. After a few minutes, the end he was holding began to get very hot. Which of the following processes correctly describes the heat traveling from one end of the bar to the other?

• radiation

• convection

• induction

• conduction

Which of the following situations describes an object's kinetic energy being converted into gravitational potential energy?

• A penny sits motionless on a shelf.

• A ball rolls up an inclined ramp.

• A water particle flows down a mountain stream.

• An apple is dropped from a second-story window.

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Clyde and Marilyn are riding a roller coaster. During which section(s) of the track is their potential energy converted to kinetic energy?

• from point B to point D only

• from point A to point B and from point C to point D

• from point B to point C only

• from point A to point B only

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The picture below shows John, Mark, and Erica on an elevator. The elevator is moving down from the 10th floor of a building to the 1st floor of the building. John's mass is 78 kilograms, Mark's mass is 31 kilograms, and Erica's mass is 54 kilograms. At any given moment when they are moving down with the elevator, which of the following statements is true?

• John has the most kinetic energy, and Mark has the least kinetic energy.

• Mark has the most kinetic energy, and Erica has the least kinetic energy.

• Mark has the most kinetic energy, and John has the least kinetic energy.

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Which of the following is an example of conduction?

• Campers warm up while sitting by a campfire.

• A metal spoon becomes warm when placed in a cup of hot tea.

• A dog's bowl of water warms up out in the sun.

• Leftovers become warm when reheated in the microwave.

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