Work, Energy, & Power Quiz

The units for work are:

• N*m

• J

• All of the above

Which of the following is not a unit of Power?

• W*s

• hp

A man pushes a box up a frictionless ramp until it reaches a dock. A different man lifts a box of the same mass from the ground up onto the same dock. Which man does more work?

• The man lifting the box

• The man pushing the box up the ramp

• Neither- both men do the same amount of work

• Unable to determine from the information provided

Two blocks from the same mass are released from the same height "h". One falls straight down, while the other slides down a frictionless ramp. Which one is moving faster as it reaches the bottom?

• Both have the same speed at the bottom

• The block that falls straight down

• The block that slid down the ramp

• Unable to determine from the information provided

A force is pushed perpendicularly onto an object with force "F". If the object is flat on a surface and doesn't move, is there work being done?

• Yes; a force is being applied

• No; a force is applied but not distance is being covered

• Yes; a distance is covered with a force

• No; a force is applied

If a nonconservative force (such as friction) acts on an object,

• The object's kinetic energy is greater than its potential energy

• The mechanical energy is conserved

• Kinetic energy is conserved

• The total energy is conserved

The conservation of energy states:

• The energy of a system is lost

• The energy into a system is equal to the energy out of a system

• The energy is not conserved

• The energy is only conserved in certain situations

What are the SI units for the spring constant "k"?

• N*m

• J*S

If the work is doubled on a system and the time remains the same, what happens to the power of the system?

• The power will quadruple

• The power will double

• The power will remain the same

• The power will half

At the top of a roller coaster the car has a potential energy of 8,500 J. As the coaster reaches the bottom of a hill, what is the kinetic energy of the roller coaster car?

• 17,000 J

• 4,250 J

• 8,500 J

• Unable to determine