Lesson 5 Mini-Quiz Review 7th Grade

During a game of pool, the cue ball is rolling toward the eight ball that is at rest. Preeta claims that all of the kinetic energy in the cue ball will get transferred to the eight ball after they collide. Which graph best supports Preeta’s claim?

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Tags

NGSS.MS-PS2-1

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which energy transfer diagram represents the racquetball and basketball demonstration?

• Basketball GE -> Racquetball GE

• Basketball KE -> Racquetball KE

• Racquetball KE -> Basketball KE

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Why did the racquetball bounce higher when bouncing from the basketball than when it was originally dropped?

• The racquetball bounced higher because it started from a higher position on the basketball.

• Both the racquetball and the basketball had increased kinetic energy when they were bounced together.

• The racquetball bounced higher because energy was transferred to it from the basketball. The basketball then bounced lower than it did on its own.

• The racquetball bounced to the same height regardless of where it starts.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS3-5

The energy in any given system stays the same (is conserved). What could be considered a system? More than one answer is possible.

• One object

• Two objects

• Any number of objects

• All of the above

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NGSS.MS-PS3-2

NGSS.MS-PS3-5

Which energy transfer diagram shows what causes the pendulum to slow down and eventually stop?

• Surrounding Air Molecules KE → Pendulum GE & KE

• Pendulum GE EE KE → Surrounding Air Molecules KE

• Pendulum GE & KE → Surrounding Air Molecules KE

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What causes the pendulum to slow down and eventually stop?

• The pendulum slows down and eventually stops because it transfers kinetic energy to the surrounding air molecules.

• The pendulum slows down and eventually stops because gravity pulls it down toward the center of the Earth.

• The GE of the pendulum gets transferred to the air around the pendulum and causes it to stop.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Why does a ball stop bouncing?

• Each time a ball hits the floor the KE gets converted to GE and some is lost to gravity. The GE gets transferred to KE and then to Elastic Energy. Friction also plays a role.

• The ball stops bouncing because each time it strikes the ground some of its energy is transferred to the surroundings, so less remains for the ball. This continues until none remains for the ball and then it stops.

• The ball stops bouncing because each time it strikes the floor the elastic energy absorbs the shock. The KE and GE decrease over time until it slows down and stops.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5