Physics M10 Test Review Energy and Its Conservation

Energy cannot be changed from one variety to another

• true

• false

Answer explanation

Energy CAN be converted from one variety to another.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-1

NGSS.HS-PS3-3

NGSS.HS-PS1-4

Gravitation always does negative work

• true

• false

Answer explanation

Gravitation does negative work on rising objects, but positive work on falling objects.

Gravitational potential energy is proportional to both mass and height above a reference level.

• true

• false

Answer explanation

Gravitational potential energy is also proportional to the constant "g."

Mechanical energy is the difference between kinetic energy and gravitational potential energy.

• true

• false

Answer explanation

Mechanical energy is the SUM of kinetic energy and gravitational potential energy.

A stretched bow and a compressed rubber ball both possess elastic potential energy.

• true

• false

Answer explanation

Elastic potential energy is stored when an elastic body is deformed.

Tags

NGSS.HS-PS3-2

According to the conservation of mechanical energy, the kinetic energy before plus the kinetic energy after equals the potential energy before plus the potential energy after.

• true

• false

Answer explanation

According to the conservation of mechanical energy, the kinetic energy plus the potential energy before equals the kinetic energy plus the potential energy after.

In a closed system, no objects enter or leave the system.

• true

• false

Answer explanation

Such a closed system is one in which energy is conserved.

Tags

NGSS.HS-PS3-4

An elastic collision is one in which

• kinetic energy before the collision equals kinetic energy after the collision.

• kinetic energy after the collision is zero.

• kinetic energy before the collision is less than kinetic energy after the collision.

• kinetic energy before the collision is greater than kinetic energy after the collision.

Answer explanation

In an elastic collision, kinetic energy is conserved.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-1

A superelastic collision is one in which

• kinetic energy before the collision equals kinetic energy after the collision.

• kinetic energy after the collision is zero.

• kinetic energy before the collision is less than kinetic energy after the collision.

• kinetic energy before the collision is greater than kinetic energy after the collision.

Answer explanation

In a superelastic collision, kinetic energy is converted from another type of energy.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-1

An inelastic collision is one in which

• kinetic energy before the collision equals kinetic energy after the collision.

• kinetic energy after the collision is zero.

• kinetic energy before the collision is less than kinetic energy after the collision.

• kinetic energy before the collision is greater than kinetic energy after the collision.

Answer explanation

In an inelastic collision, kinetic energy is converted to another type of energy.

Tags

NGSS.HS-PS2-3