Physics 11.6.18 - Energy & Work

Which statement below is NOT true about energy?

• Energy is a mover of substances.

• Energy is not conserved.

• Energy is a thing and a process.

• Energy can be observed when it is being transferred or transformed.

Which statement below is not true regarding work?

• Work is an application of a force.

• Work involves a movement by a force.

• Work is the product of Force and Time.

• Work is the product of Force and Distance.

True or False: Distance is directly proportional to Work.

• True, and work is inversely proportional to force.

• True, and work is directly proportional to force.

• False, distance it is inversely proportional to work.

• False, distance and force are unrelated.

Work is done in lifting a sandbag. How much work is done in lifting a sandbag that is twice as heavy the same distance?

• Twice as much

• Half as much

• The same

• Depends on the speed of the lift

Which statement is NOT true in regards to power?

• Power is the measure of how fast work is done.

• Power is work done divided by the time interval.

• Power is inversely proportional to the time interval.

• The longer it takes something to be done to more power is used.

What is the unit for Power?

• Watt/m

• Watt

• Joule/m

• Newton

A job can be done slowly or quickly. Both may require the same amount of work, but different amounts of......

• Impulse

• Power

• Energy

• Momentum

What are the two factors that determine an objects state of mechanical energy?

• Velocity and Power

• Position and Time

• Distance and Time

• Motion and Position

Which example below best represents Kinetic Energy?

• A bow ready to fire an arrow

• Water held in a high reservoir

• A rock falling from a vertical cliff

• A rock resting at the edge of a vertical cliff

What is the equation for calculating Potential Energy?

• mgt

• Force multiplied by Distance

• mass X height X acceleration due to gravity

• (Power)(Work)