You are to place a 25.0 kg load on a truck. You can either use a ramp, or you can lift it
up vertically and put it on the truck. Compare the work done in the two cases. Ignore
friction in the ramp.
a. Work is more in carrying it up the ramp as the distance is increased.
b. Work is more in lifting it vertically as more force is needed.
c. Work is the same in both cases.

c. Work is the same in both cases.

How much work is done by you when you walk up the stairs from the ground level to
the third level, and then walk back down to the ground level?
a. Some positive number, depending on your mass and height of the third level.
b. Some negative number, depending on your mass and height of the third level.
c. Zero.

c. Zero.

The direction of kinetic energy has
a- same direction as the object's speed.
b- same direction as the object's weight.
c- direction opposite to the object's velocity.
d- no direction attached with it.

d- no direction attached with it.

Which of the following answers is correct regarding conservative forces?
a. Friction and gravity are conservative forces.
b. Electromagnetic forces and friction are conservative forces.
c. Gravity and momentum are conservative forces.
d. Electromagnetic force and gravity are conservative forces

d. Electromagnetic force and gravity are conservative forces

Persons A and B both carry a mass of 3.00 kg from the first floor up to the third floor.
Person A reaches the third floor in 100 seconds, while person B reaches in 150 seconds.
Which of the following is true?
a. A does more work and uses more power than B.
b. A does less work and uses less power than B.
c. A does same work and uses same power as B.
d. A does same work and uses more power than B.
e. A does more work and uses less power than B.

d. A does the same work and uses more power than B.

A crate with mass 32.5 kg initially at rest on a warehouse floor is acted on by a net horizontal force of 140 N. What acceleration is produced?

4.31 m/s/s

4550 m/s/s

32.5 m/s/s

0.232 m/s/s

4.31 m/s/s

A crate with mass 25.0 kg initially at rest on a warehouse floor is acted on by a horizontal force of 100 N. The friction force between the crate and the floor is 40.0 N. What acceleration is produced? (give your answer in m/s²)

Group of answer choices

5.60

2.40

1.60

4.00

2.40

What is the purpose of the motion sensor in this experiment (mark best answer)

Group of answer choices

To see if the cart is in motion

To measure the mass of the cart

To measure the tension in the string

To measure the acceleration of the cart

To measure the acceleration of the cart

If we put extra wights on the cart, how would that affect the cart's acceleration (for the same hanging mass)
Group of answer choices

The acceleration would be larger

There would be no affect of the acceleration

The acceleration would be smaller

The acceleration would be smaller

How would increased friction in the wheels of the cart affect the acceleration (for the same hanging mass)
Group of answer choices

It would increase the acceleration

There would be no affect on the acceleration

It would decrease the acceleration

It would decrease the acceleration

When would you expect the tension in the string to be maximum, for the same hanging mass?
Group of answer choices

When there is some mass in the cart, so that its acceleration is small

When you hold the cart so that it does not move

when the cart is very light so that its acceleration is large

When you hold the cart so that it does not move

An amount of work equal to 6.0 J is required to compress the spring in a spring-gun.
What is the potential energy of the compressed spring?
a. 6.0 J
b. 3.0 J
c. 1.0 J
d. 1/6 J

a. 6.0 J

An amount of work equal to 10 J is required to compress a spring.
What is the potential energy of the spring?

a. 10 J
b. 5 J
c. 20 J
d. 0 J

a. 10 J

A spring stores 8.0 J of potential energy after being compressed.
How much work was done on the spring?

a. 8.0 J
b. 4.0 J
c. 16.0 J
d. 0 J

a. 8.0 J

A force does 12 J of work compressing a spring.
What is the elastic potential energy?

a. 6 J
b. 12 J
c. 24 J
d. 1/12 J

b. 12 J

A spring gun is compressed, storing 15 J of energy.
How much work was required to compress it?

a. 15 J
b. 7.5 J
c. 30 J
d. 0 J

a. 15 J

Work is done on a spring and equals 9 J.
What is the spring’s potential energy?

a. 9 J
b. 18 J
c. 4.5 J
d. 0 J

a. 9 J

You throw a ball of mass 5 kg straight up with velocity 10 m/s, what will be its Potential
Energy when it reaches its highest position?
a- 50 J
b- 250 J
c- 500 J
d- 100 J

a. 50 J

A ball of mass 2 kg is thrown straight up at 10 m/s.
What is its potential energy at the highest point?

a. 20 J
b. 50 J
c. 100 J
d. 200 J

100

A 4 kg object is thrown upward with velocity 5 m/s.
What is the potential energy at the top?

a. 25 J
b. 50 J
c. 100 J
d. 10 J

50

A 1 kg ball is thrown straight up at 20 m/s.
What is its potential energy at the highest point?

a. 100 J
b. 200 J
c. 400 J
d. 20 J

200

A 3 kg object is thrown upward at 8 m/s.
What is the potential energy at the highest point?

a. 96 J
b. 192 J
c. 48 J
d. 24 J

96

An object is thrown upward and has initial kinetic energy of 150 J.
What is its potential energy at the highest point?

a. 75 J
b. 150 J
c. 300 J
d. 0 J

150