Work, Power and Machines

It takes 20 N of force to move a box a distance of 10 m. How much work is done on the box in Joules?

• 200 J
• 20.0J
• 100 J
• 10 J

All of the following describe situations in which work is done by an organism EXCEPT for which situation?

• A bird carries a worm to it's nest
• A squirrel hides a nut in a tree
• Ants bring crumbs into their homes
• Leave decompose on the forest floor

 Work done = Force x blank?

• a. distance
• b. acceleration
• c. velocity
• d. speed

In which of the following situations do your arms do work on books?

• holding a heavy stack of books while standing
• carrying a heavy stack of books
• dropping a stack of books onto a table
• picking up a pile of books from the floor

You apply a force of 18 N to a dresser and move it 3.0 m. How much work did you do on the dresser?

• 54 J
• 6.0 J
• 21 J
• 27 J

What is the unit used to measure Power?

• Joule
• Watt
• Newton
• Pascal

A job is done slowly, and an identical job is done quickly.  Both jobs require the same amount of ___, but different amounts of _____

• work, energy
• power, work
• work, power
• force, work

What type of simple machine is found on the cap of a pickle jar?

• lever
• inclined plane
• pulley
• screw

Which of these is an example of a wedge?

• skateboard
• broom
• stairs
• butter knife

Which is an example of someone using a simple machine to do work?

• a boy runs across a football field
• a banker counts money
• a mother pushes a stroller up a ramp
• a girl eats a sandwich