Simple Machines & Energy Test Review

If Greg applies a force of 100 N to move a box 4 meters, how much work did he do?

• 400 J

• 25 J

• 0.04 J

• 104 J

Tags

NGSS.HS-PS3-1

Which student is doing work?

• Angel is leaning against the classroom wall.

• Brandon is lifting his backpack up onto his shoulders.

• Cindy is holding up her lunch tray.

• Daniella is studying the science chart on the wall.

How does an inclined plane make lifting a heavy object easier?

• The object is moved over a shorter distance.

• The ramp increases the amount of work done.

• Less force is needed to move the object over a longer distance.

• More force is needed to move the object over a longer distance.

What is the mechanical advantage of the lever in the picture above?

• 8000

• 400

• 25

• 8

How much work does the person do as he pushes the barrel up the ramp with a force of 200 N in the picture above?

• 2400 J

• 1600 J

• 300 J

• No work is done.

Tags

NGSS.MS-PS3-4

Which inclined plane would require the most work (NOT FORCE) to be done to move the car to the top of the chair?

• Ramp 1

• Ramp 2

• Ramp 3

• The work would be the same for Ramp 1, 2, and 3.

Tags

NGSS.MS-PS3-2

An ax splitting wood is an example of what kind of simple machine?

• Pulley

• Screw

• Wedge

• Inclined plane

What is the mechanical advantage of a machine that changes only the direction of a force, like a pulley on a flagpole?

• 0

• 1

• 2

• 10

Which picture above is an example of an inclined plane?

• Light bulb

• Flagpole

• Screwdriver

• Ladder

An inventor claims to have built a machine that can produce 120 J of work with an input of 110 J. What should you think about this claim?

• It is possible because machines can multiply the work.

• It is possible because the machine’s efficiency is less than 100%.

• It is possible because all machines create energy when they are used.

• It is impossible because a machine’s efficiency cannot exceed 100%.