Lesson 7 Mini-Quiz Review 7th Grade

Which of the following types of energy is potential energy?

• Gravitational energy

• Kinetic energy

• Thermal energy

• Sound energy

Tags

NGSS.MS-PS3-2

When you wave your hands in the air, what happens to the kinetic energy of the air molecules around your hands?

• It stays stable, does not increase, does not decrease.

• It increases.

• It decreases.

• Air molecules are not affected by the objects around it.

Tags

NGSS.MS-PS3-5

Why does a guitar string stop vibrating?

• The guitar string transfers elastic energy to the air molecules around it.

• The KE of the guitar string slows down until it stops.

• Elastic energy from the guitar string gets converted to KE. The KE gets transferred to the air as sound energy.

• The elastic energy from the guitar string gets absorbed into the air until the string stops moving.

Tags

NGSS.MS-PS3-5

Which Energy Transfer Diagram best represents the rolling can?

• Rolling Can: Elastic Energy, SE, TE, KE -> The Environment: SE, TE, KE

• The Environment: Sound Energy, Thermal Energy -> Rolling Can: Elastic Energy, Kinetic Energy

• Rolling Can: Elastic Energy, Kinetic Energy -> The Environment: Sound Energy, Thermal Energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which Energy Transfer Diagram shows a bouncing ball transferring energy to its surrounding? This energy transfer diagram should consider kinetic, gravitational, elastic, thermal, and sound energy.

• Basketball: GE KE Elastic E -> The Environment: KE

• Basketball: GE KE Elastic E SE TE -> The Environment: SE TE

• Basketball: GE KE Elastic E -> The Environment: KE GE Elastic E SE TE

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Why does a ball stop bouncing? Select TWO that apply.

• Every time the ball bounces, the ball gets so compressed that it becomes less elastic and the KE was all converted to GE.

• As a ball bounces GE is converted to KE which is converted to Elastic E and back to KE and GE.

• As the energy is being converted some of it is being transferred to the environment as sound energy (SE) and thermal energy (TE).

• Friction with the air and floor converts energy to heat, so less is available to bounce.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5