Which of the following statements are true about work?

A Watt is the standard metric unit of work.

Work is a time-based quantity; it is dependent upon how fast a force displaces an object.

Which of the following statements are true about power?

Power refers to how fast work is done upon an object.

If person A and person B do the same job but person B does it faster, then person A does more work but person B has more power.

Powerful people or powerful machines are simply people or machines which always do a lot of work.

Which of the following statements are true about conservative and non-conservative forces?

The force of gravity and elastic (spring) force are both examples of a conservative forces.

A force is regarded as a non-conservative force if it does not add mechanical energy to a system of objects.

Physicists envy biologists' ability to instill order on the world of animal species through their taxonomic system. So physicists have made a habit of identifying forces as conservative and non-conservative forces in order to instill order on the world of forces.

Which of the following statements are true about kinetic energy?

If an object is at rest, then it does not have any kinetic energy.

Kinetic energy is the form of mechanical energy which depends upon the position of an object.

If an object is on the ground, then it does not have any kinetic energy.

Which of the following statements are true about potential energy?

Potential energy is the energy stored in an object due to its position.

Both gravitational and elastic potential energy are dependent upon the speed of an object.

Moving objects cannot have potential energy.

An arrow is drawn back so that 150 Joules of potential energy is stored in the stretched bow and string. When released, the arrow will have a kinetic energy of ____ Joules. Presume that the value of g is ~10 m/s/s.

unknown (not enough information)

A ball is projected into the air with 100 J of kinetic energy. The kinetic energy is transformed into gravitational potential energy on the path towards the peak of its trajectory. When the ball returns to its original height, its kinetic energy is ____ Joules. IGNORE the effects of air resistance. Presume that the value of g is ~10 m/s/s.

unknown (not enough information)

Which requires more work: lifting a 50.0 kg crate a vertical distance of 2.0 meters or lifting a 25.0 kg crate a vertical distance of 4.0 meters? Presume that the value of g is ~10 m/s/s.

Both require the same amount of work

There isn't enough information to tell

A 65.8-kg skier accelerates down an icy hill from an original height of 521 meters. Use the work-energy theorem to determine the speed at the bottom of the hill if... (a) no energy is lost or gained due to friction, air resistance and other non-conservative forces. (b) 1.40*105 J of energy are lost due to external forces. Presume that the value of g is ~9.8 m/s/s.

(a) v = 101 m/s; (b) v = 77.2 m/s

(a) v = 77.2 m/s; (b) v = 101 m/s

(a) v = 151 m/s; (b) v = 87.2 m/s

Work, Power, Energy Review

Authored by Charles Martinez

Physics

11th - 12th Grade

NGSS covered

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50 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the kinetic energy of a 9.2kg book that has a speed of 5.5m/s?

.5J

9.2J

25J

139.2J

Tags

NGSS.HS-PS3-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

True or false: when the distance an object moves is zero the work done on the object is also zero.

True

False

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the potential energy done in lifting a 50kg barbell 5.8m above the floor?

50J

9.81J

2845J

58J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many joules of potential energy does a 5.2kg book gain when it is elevated 4m?

204.1J

52J

9.81J

48.99J

Tags

NGSS.HS-PS2-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Belly-Flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 10,000J. What is his kinetic energy when his potential energy reduces to 9.7J?

9.81J

10,000J

9.7J

9,990.3J

Tags

NGSS.HS-PS3-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A moving car has kinetic energy and speeds up until it's going 2 times as fast. It has _____ times more kinetic energy.

Tags

NGSS.HS-PS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the work done when a 20N force pushes a cart 3.5m?

70J

6.8J

23.5J

17.5J

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Work, Power, Energy Review

What is the kinetic energy of a 9.2kg book that has a speed of 5.5m/s?

True or false: when the distance an object moves is zero the work done on the object is also zero.

What is the potential energy done in lifting a 50kg barbell 5.8m above the floor?

How many joules of potential energy does a 5.2kg book gain when it is elevated 4m?

Belly-Flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 10,000J. What is his kinetic energy when his potential energy reduces to 9.7J?

A moving car has kinetic energy and speeds up until it's going 2 times as fast. It has _____ times more kinetic energy.

What is the work done when a 20N force pushes a cart 3.5m?

True or false: a 10N force over a distance of 5m requires more work than a 20N force over a distance of 2m.

True or false: work is done on an object when a force causes a displacement of the object.

Which trig function is used in the work equation?

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