Unit 4 Energy checkpoint Review

What type of energy does the rubber band have?

• The rubber band has kinetic energy stored in it when pulled back.

• The rubber band has elastic potential energy stored when pulled back.

• The rubber band transforms itself into kinetic energy

• The rubber band has gravitational potential energy stored in it when pulled back.

Tags

NGSS.MS-PS3-2

Student A lifts a 20-newton box from the floor to a height of 0.10 meters in 2 seconds. Student B lifts a 10-newton box from the floor to a height of 0.20 meters in 1 second. Compared to student A, which of the following describe the work and power of student B. (hint: Calculate work first using W=FXD, then calculate power using P=W/t) Select two correct answers.

• student B does more work

• student B does less work

• Student B does the same work

• Student B develops more power

• student B develops less power

Tags

NGSS.MS-PS3-4

A horizontal force of 8.0N acts on an object over a distance of 5.0 m along a horizontal, frictionless surface. How much work is completed over the 5.0 m distance? (remember W=FXD)

• 2 J

• 40 J

• 1 J

• 50 J

Tags

NGSS.HS-PS3-2

A pencil is dropped from a bridge. What happens to the magnitude of the acceleration, speed, gravitational potential energy and kinetic energy of the pencil as it falls? (neglect friction)

• all stay constant

• acceleration remains constant, gravitational potential energy decreases, speed and kinetic energy increase

• acceleration decreases, gravitational potential energy increases, speed and kinetic energy decrease

• all will decrease

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-2

The table shows the mass, velocity, and height of four different objects. Which of the following has the highest kinetic energy? Remember to find kinetic energy the formula is 1/2mv²

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

Which of the following is an example of kinetic energy being transformed into potential energy?

• Throwing a ball into the air

• Droppin a ball from a ladder

• Rolling a ball on the ground

• Holding a ball in the air withough moving it

Tags

NGSS.MS-PS3-5

The diagram shows various positions of a pendelum that is swinging. As the pendulum swings from position A to position B, which position has the highest kinetic energy? Choose one correct answer.

• A

• B

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

A rock is pulled back in a slingshot in the diagram. The elastic on the slingshot is displaced 0.2m from its initial position. The rock is pulled back with a force of 30N. When the rock is released what is its kinetic energy? Remember that W=FXD and work is equal to kinetic energy. .

• 10J

• .007 J

• 6J

• 150 J

Tags

NGSS.MS-PS3-4

NGSS.MS-PS2-2

Which of the following does NOT contribute to the potential energy of an object?

• Height of the object above the Earth's surface.

• Gravitational constant, or g, of the Earth.

• Velocity of the object.

• Mass of the object.

Tags

NGSS.MS-PS3-2

Two physics students, Clark and Barry, are in a weightlifting room. They are the same height. Clark lifts a 120 lb barbell over his head 10 times in one minute. Barry lifts the 120 lb barbell over his head 10 times in 10 seconds. They do not return the barbells to their original position and they both lift their barbells the exact same height above their head. Which student does the most work? Which student delivers the most power?

• They both do the same work but Barry delivers more power because he completes the exercise in a shorter amount of time.

• Clark does the most work and power because he is faster.

• Barry does more work and power because he takes longer to complete the exercise.

• none of the above

Tags

NGSS.MS-PS3-5