Quiz 2 Review

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

Two factors that determine work are

• size of the force, and distance
• size of the force, and type of force
• mass, and distance

units for work are

• netwons
• joules
• meters
• seconds

if you push a cart with a force of 60 N for 2 m... how much work have you done

• 120 J
• 30 J
• 120 N 
• 30 N

If you do 40 joules of work lifting a 10N box, how high is the shelf you move it to.

• 400m
• 40m
• 50m
• 4m

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

Ms. McDonald holds a desk perfectly still above her head. If she holds the desk at a height of 0.5 meters above her head, and applis 68 Newtons of force to do so, how much work has she done?

• 34 Joules
• 0 Joules

What is speed?

• how far you go
• how much distance is covered over a period of time
• how fast you accelerate
• the change in the location of a object

What is the formula to calculate speed?

• Speed = time/distance
• Speed = distance/time
• Speed = distance x time
• Speed = time x distance