How much the net work is done on an object (5 kg) at rest or moving at a constant velocity? a.0 J
b.5 J
c.500 J
d.50 J

Which of the following is an example of Kinetic Energy (KE)?
a. A potential to do work
b. Energy from food
c. Moving cars or trucks
d. Energy inside gasoline

Which one of the following is correct about Kinetics Energy? Select all correct options!
a. It has directions like force.
b. It can be negative or positive.
c. It is scalar quantity.
d. It can be positive or negative depending on whether energy given to or taken from a system

Which of the following is not an example of potential energy?
Select one:
a. Electrical energy stored in a battery
b. Energy from a moving object like a car, truck, or train
c. Thermal energy stored in a heat-pack.
d. Energy stored in the spring

Which of the following is correct about units?
a. The unit for both work and energy is "N"
b. Unit of work is "J" and unit of energy is "N"
c. The unit for both work and energy is "J"
d. Unit of work is "N" and unit of energy is "J"

When we move a 10 N box upward to a height of 1 m, your work is:
a. Zero
b. Positive
c. Does not exist
d. Negative

Kinetics energy can be converted to potential energy; but, potential energy can not be converted to kinetics energy

True
False

Law of conservation of energy: energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.

True
False

A 1.5 kg ball is thrown upward at 10 m/s. What is its velocity when it is 2 m above the release point? Use the equation:

KE1+PE1=KE2+PE2

KE=1/2mv2

PE=mgh

Assume g=9.8 m/s2

In position 1, h=0 m and v=10 m/s

In position 2, h=2 and we need to find v=?

a.4.6 m/s
b.0 m/s
c.10 m/s
d.7.8 m/s

A 25 N force pushes a block across a surface for 6 m. How much work is done by the applied force?
a.31 J
b.150 J
c.75 J
d.0 J

A 50 N block is raised 2 m. If the net work done on the block is 50 J, what is the applied force on the block?

a.100 N
b.75 N
c.25 N
d.50 N

A forklift applies a force of 2,000 N to raise a box 3 m. How much work is done by the forklift in raising the box?
a.3000 J
b.2000 J
c.6000 J
d.2003 J

A 3 kg ball is thrown downward at 4 m/s from a height of 1.5 m. What is the kinetic energy of the ball as it leaves the thrower’s hand?

a.6 J
b.24 J
c.12 J
d.48 J

Runaway truck ramps are common on mountainous highways in case the brakes fail on large trucks. If a runaway 60,000 kg truck is moving at 27 m/s, how much work must be done to stop the truck? Remember: 1 Mega Joule= 1 Million Joule and 1 Kilo Joule=1000 Joule.

a.21.9 Kilo Joule (KJ)
b.21.9 Mega Joule (MJ)
c.81 Kilo Joule (KJ)
d.81 Mega Joule (MJ)

An 10 kg object is moved for 5 m with an acceleration of 2.5 m/s2, how much the work is?
a.50 J
b.125 J
c.75 J
d.25 J