Open and Closed Systems

Which of the following is true?

• Energy is found only in living objects

• Energy is a fuel

• Energy is a substance or fluid

• Energy is associated only with movement

• Any store of energy may be transferred into another store

Which of the following is not a store of energy?

• friction

• magnetic

• electrostatic

• nuclear

Tags

NGSS.MS-PS3-2

Which of the following is false?

• Energy is the product of an activity

• Energy cannot be created or destroyed

• When gravity pulls an object towards the ground, energy is transferred mechanically

• A car's engine produces useful kinetic energy and wasted thermal energy

Tags

NGSS.MS-PS3-5

As the cyclist accelerates, the _______________________ energy store in the cyclist’s body decreases and the _______________________ energy of the cyclist increases.

• chemical; kinetic

• gravitational potential; kinetic

• elastic potential; kinetic

• kinetic; gravitational potential

• kinetic; chemical

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

As the drone accelerates upwards its __________________________ energy increases and its __________________________ energy increases.The __________________________ energy store of the battery decreases.

• kinetic ; gravitational potential ; chemical

• chemical ; gravitational potential ; kinetic

• kinetic ; gravitational potential ; nuclear

• kinetic ; elastic potential ; chemical

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

NGSS.MS-PS3-2

A ball is thrown up in the air with 100 J of kinetic energy. How much gravitational potential energy does the ball have stored at the peak of its throw?

• 100 J

• 50 J

• 25 J

• 10 J

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

Which of the following is an example of a system producing useful energy?

• car: kinetic

• iPhone: thermal

• car: thermal

• lightbulb: thermal

Tags

NGSS.HS-PS3-3

Which of the following is an example of a mechanical transfer of energy?

• A battery powering a light bulb.

• A candle generating heat

• A candle generating light

• A ball falling towards the Earth

Tags

NGSS.MS-PS3-5

If a falling ball has, at one point in its fall, 20 J of gravitational potential energy and 60 J of kinetic energy, how much kinetic energy will it have when it strikes the Earth?

• 80 J

• 60 J

• 20 J

• 40 J

Tags

NGSS.HS-PS3-1

If a roller-coaster cart moving towards the top of a track has 40 J of kinetic energy and 30 J of gravitational potential energy, how much gravitational potential energy will it have at the top of the track?

• 70 J

• 40 J

• 30 J

• 10 J

Tags

NGSS.HS-PS3-1