7.P.11.2 Energy & 7.P.11.4 Heat Flow

A variety of energy transformations occur in different situations. Which of the following statements involves the change from chemical to electromagnetic to mechanical to sound energy?

• A charcoal grill feels hot.

• A basketball player throws a basketball.

• A cell phone plays a video from YouTube.

• The Sun heats the concrete of the sidewalk.

Look at the picture of the battery-operated flashlight below. What is the sequence of energy transformations that occur when a battery operated flashlight is turned on?

• electrical → chemical → light

• electrical → light → chemical

• 1. chemical → electrical → light

• 1. chemical → light → electrical

Tags

NGSS.MS-PS3-5

When a ball bounces, it has changing amounts of potential and kinetic energy. Eventually the ball will stop bouncing and come to rest. Which of the following best describes why the ball stops bouncing?

• The ball’s energy is transformed into chemical energy.

• The ball’s energy gets transformed to heat and sound energy.

• The mass of the ball is too small to allow the ball to continue its own motion.

• The pull of gravity is stronger than the energy in the ball, which makes the ball stop bouncing.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following is the best example of solar energy being converted into chemical energy?

• photosynthesis

• heating of the road

• formation of clouds

• evaporation of water

Tags

NGSS.MS-LS1-6

A student observes a beaker of room temperature water resting on a table. She states that the beaker of water does not have any energy. Which statement below is accurate regarding her observation?

• She is correct because the beaker of water is not moving.

• She is incorrect because the beaker of water has thermal energy.

• She is incorrect because all water contains hydrogen and oxygen.

• She is correct because the beaker of water is at room temperature.

Tags

NGSS.MS-PS1-4

Lamark goes to a bowling alley to test his belief that rolling a bowling ball slowly will result in knocking down more pins. He gently rolls his bowling ball towards the bowling pins lined up at the end of the lane. The bowling ball stops in the middle of the lane without striking the pins. Which statement below best explains what happened?

• The ball's kinetic energy is transforming to potential energy.

• The ball needs more thermal energy to knock down the pins.

• Some of the ball’s kinetic energy is transformed into sound and thermal energy.

• The chemical energy of the lane reduces the mechanical energy of the bowling ball.

Tags

NGSS.MS-PS3-5

Which of the following best explains the difference in potential energy and kinetic energy calculated by the student after the first trial with the model car on the ramp?

• The student did not include the effect of friction in his calculation.

• The measured height of the ramp was less than the actual height.

• The student accidentally accelerated the car at the top of the ramp.

• The car gained a small amount of mass as it moved down the ramp.

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

Julia tosses a ball into the air and watches it fall back into her hand. At what point does the ball only have potential energy?

• at its highest point

• as it leaves Julia’s hand

• halfway up to its highest point

• just before it lands back in Julia’s hand

Tags

NGSS.MS-PS3-2

Pablo and Charles were conducting an investigation where they were measuring the energy of a glass marble as it rolled down a ramp. According to their calculations, the total energy of the marble decreased. Which statement below is the best explanation for the decrease in total energy?

• The energy decreased because it was destroyed by the interaction with the ramp.

• The total amount of energy always decreases in an energy conversion and is expected.

• The scientists’ calculations were incorrect; the energy totals should have been the same.

• The energy decreased because heat resulted from the friction between the marble and the ramp.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following statements is true about the law of conservation of energy?

• The law of conservation of energy explains the movement of objects due to gravity.

• The law of conservation of energy describes how energy is transformed in systems.

• The law of conservation of energy describes why an object’s mass increases its force.

• The law of conservation of energy explains why moving objects possess kinetic energy.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5