Energy

Calculate the gravitational potential energy relative to the ground when an 82 kg person climbs to the top of a 2.0 m stepladder.

• 402 J

• 164 J

What is the kinetic energy of a 1.40 kg discus with a speed of 22.5 m/s?

• 15.8 J

• 31.5 J

• 354 J

• 709 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

When a pitcher throws a softball to a catcher, immediately before the ball is thrown is _____ energy, while the motion of the ball toward the catcher is _____ energy.

• potential, nonmechanical

• electrical, thermal

• potential, kinetic

• mechanical, chemical

Tags

NGSS.HS-PS3-2

A dog running at a speed of 12 m/s has 1,080 J of kinetic energy. What is the mass of the dog?

• 45 kg

• 7.5 kg

• 15 kg

• 30 kg

Tags

NGSS.MS-PS3-1

An astronaut with a mass of 91 kg is 0.30 m above the moon’s surface. The astronaut’s potential energy is 46 J. Calculate the free-fall acceleration (g) on the moon.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

At the top of its arc, a thrown ball has _____ potential energy.

• maximum

• minimum

• zero

• average

As a dropped penny falls toward the ground, _____ energy is converted to _____ energy.

• thermal, potential

• kinetic, vibrational

• kinetic, heat

• potential, kinetic

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

The law of conservation of energy states that energy

• is created from motion.

• cannot be created or destroyed.

• is always equal and opposite.

• can only be converted into heat.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A system that receives energy from external sources is called

• open.

• closed.

• compound.

• efficient.

Tags

NGSS.HS-PS3-4

What is the gravitational potential energy of a 54 kg box that is 8.0 m above the ground?

• 5,500 J

• 4,200 J

• 3,400 J

• 550 J

Tags

NGSS.MS-PS3-2