QUESTION 1

How does work relate to energy?

	a.	Work is stored energy
	b.	Work is a change in energy
	c.	Work is a type of energy
	d.	Work is a dark energy

1 points

QUESTION 2

When is work done?

	a.	When force and displacement are perpendicular
	b.	When force and displacement are parallel
	c.	When force and displacement are perpendicular and there is no displacement
	d.	When force and displacement are parallel and there is no displacement

1 points

QUESTION 3

A child pushes an ice cream cone 2.0 m across a level surface with 2 N of force. What is the work done on the ice cream cone by the child?

	a.	0 J
	b.	0.5 J
	c.	2.0 J
	d.	4.0 J

1 points

QUESTION 4

A flight attendant pulls a flight bag in a complete circle with a distance of 250 m. A 30.0 N force is exerted on the bag at an angle of 50.0 above the horizontal. How much work is done on the flight bag?

	a.	0 J
	b.	3124 J
	c.	4821 J
	d.	8035 J

1 points

QUESTION 5

Which of the following is the sum of kinetic and potential energy?

	a.	Total energy
	b.	Net energy
	c.	Non-mechanical energy
	d.	Mechanical energy

1 points

QUESTION 6

A 3.0kg toy falls from a height of 10.0 m.Just before hitting the ground,what will be its potential energy? (Ignore air resistance)

	a.	0 J
	b.	0.98 J
	c.	29.4 J
	d.	294 J

1 points

QUESTION 7

A 3.0 kg toy falls from a height of 10.0 m. Just before hitting the ground, what will be its kinetic energy? (Ignore air resistance)

	a.	0 J
	b.	0.98 J
	c.	29.4 J
	d.	294 J

1 points

QUESTION 8

If both the mass and the velocity of a ball are tripled, the kinetic energy of the ball is increased by a factor of...

	a.	3
	b.	6
	c.	9
	d.	27

1 points

QUESTION 9

The main difference between kinetic energy and potential energy is...

	a.	Kinetic energy involves position and potential energy involves a motion
	b.	Kinetic energy involves motion and potential energy involves position
	c.	Although both energies involve motion, only kinetic involves position
	d.	Although both energies involve position, only potential involves motion

1 points

QUESTION 10

Which of the following equations is NOT an equation for power?

	a.	P =Fd/t
	b.	P =W/t
	c.	P =Fv
	d.	P = Fv/t

1 points

QUESTION 11

What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s?

	a.	2.7 J
	b.	5.4 J
	c.	53 J
	d.	108 J

1 points

QUESTION 12

What is the average poweroutput of a weight lifter who can lift 250 kg a distance of 2.0 m in 2.0 s?

	a.	2450 W
	b.	2000 W
	c.	1450 W
	d.	250 W

1 points

QUESTION 13

A child and a sled with a combined mass of 50.0 kg slide down a frictionless hill. What type of energy does it have at the top of the hill (before moving) and at the bottom (while still moving)?

	a.	Top-kinetic /Bottom-Potential
	b.	Top-Potential /Bottom-Kinetic
	c.	Top-Potential+Kinetic /Bottom-Kinetic
	d.	Top-Potential /Bottom-Potential+Kinetic

1 points

QUESTION 14

A child and a sled with a combined mass of 50.0 kg slide down a frictionless hill. If the sled starts from rest and has a speed of 2.0 m/s at the bottom, what is the total amount of energy at the bottom of the hill?

	a.	100 J
	b.	50 J
	c.	25 J
	d.	0 J

1 points

QUESTION 15

A child and a sled with a combined mass of 50.0 kg slide down a frictionless hill. If the sled starts from rest and has a speed of 2.0 m/s at the bottom, what is the height of the hill?

	a.	20 m
	b.	2 m
	c.	0.2 m
	d.	0.02 m