Work, Power, & Energy 2020

Which of the following is true regarding work? (choose all that are true) (2)

• Work is the product of force & distance

• If no movement occurs, then no work is done

• Work is the process by which energy changes form

• Work is completed when a force is applied to an immovable object.

• Work is done when a force acts on an object and it moves

The formula to calculate work is ______________. (3)

• Force = Work X Distance

• Force = Distance / Work

• Work = Force x Distance

• Work = Distance / Force

A unit used for work is __________________. (3)

• meters (m)

• grams (g)

• newtons (N)

• joules (j)

A man weighing 750 N climbs a flight of stairs 5 m high. How much work has he done? (4)

• 2000 J

• 2500 J

• 3750 J

• 5050 J

A 10 N book is raised 100 meters from the floor. How much work is done? (4)

• 10 J

• 100 J

• 1000 J

• 1010 J

Bob does 20 J of work while pushing a shopping cart 2 meters. What is the force applied? (4)

• 10 N

• 2O N

• 40 N

• 400 N

Saul pulls a 50 N sofa up an incline producing 250 J of work. How far did he pull the sofa? (4)

• 0.2 m

• 5 m

• 25 m

• 200 m

A 10 kg object is pulled vertically upward 5 m by a rope with an acceleration of 2 m/s². Find the work done by the tension force in the rope. (4)

• 4 J

• 25 J

• 100 J

• 225 J

Which of the following are true about power? (choose correct choices) (5)

• how work is calculated

• the rate of doing work

• doing work at a faster rate requires more power

• to increase the power, work must be completed quicker

• without work, there is no power

Power is equal to ____________________.(6)

• force times time

• force divided by time

• work times time

• work divided by time