What is friction?

• The total amount of potential and kinetic energy in a system

• The rate at which energy is converted

• A force that opposes motion between objects that are touching

• The ability to do work or cause change

What does mechanical energy refer to?

• The rate at which energy is converted

• The total amount of potential and kinetic energy in a system

• Energy that cannot be created or destroyed

• A force that opposes motion between objects that are touching

What is the law of conservation of energy?

• The rate at which energy is converted

• The total amount of potential and kinetic energy in a system

• Energy cannot be created or destroyed

• A force that opposes motion between objects that are touching

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What is power in the context of energy?

• The total amount of potential and kinetic energy in a system

• Energy that cannot be created or destroyed

• A force that opposes motion between objects that are touching

• The rate at which energy is converted

What can some of the kinetic energy of a fast-moving roller coaster be changed into when it comes to a stop due to friction in the brakes?

• Thermal energy

• Sound energy

• Chemical energy

• Magnetic energy

Tags

NGSS.MS-PS3-5

If a roller coaster compresses one or more springs as it stops, the kinetic energy might be changed into what type of energy?

• Elastic potential energy

• Nuclear energy

• Electrical energy

• Wind energy

Tags

NGSS.MS-PS3-4

When is the kinetic energy of a projectile highest relative to its position to Earth?

• When it is at the highest point in its trajectory.

• When it is at the midpoint of its trajectory.

• When it is closest to Earth.

• When it stops.

Tags

NGSS.HS-PS3-2

What is the formula for calculating power (P) in terms of force (f), distance (d), and time (t)?

• P = f + d + t

• P = f × d × t

• P = f × d / t

• P = f + d / t

What is a Newton meter also known as?

• A Watt

• A Joule

• A Pascal

• A Hertz

Does holding a heavy object motionless involve a lot of work according to the chapter on Work and Energy?

• Agree

• Disagree

• Not mentioned

• Uncertain