Work Power and Simple Machines

Applying a small force over a long distance can be exchanged with..

• a small force over a small distance

• a large force over a small distance

• a large force over a long distance

• You cannot change the amount of force you apply

When using an inclined plane,

• you do less work

• you do the same amount of work, it is just easier

Which of the following would be an example of a wedge:

• a knife

• stairs

• a skateboard

• a broom

Calculate the amount of work done if you use a 100N force to push a 50 kg box 5 m across the kitchen floor. 

• 250 J 

• 500 J

• 5000 J

• 50,000 J

Tags

NGSS.MS-PS3-5

A simple machine that consists a rigid bar that pivots on a fixed point

• lever

• pulley

• wheel and axle

• fulcrum

The device used to raise a flag up a flag pole is an example of a

• wheel and axle

• lever

• inclined plane

• pulley

Which of the following does a simple machine do?

• allows the users to apply less force over a longer distance

• reduce the amount of force needed to do work

• change the direction of the applied force

• all of the above

How can you reduce the amount of force required to lift an object using an inclined plane (ramp)?

• increase the length of the ramp

• increase the height of the ramp

• decrease the length of the ramp

Tags

NGSS.MS-ETS1-1

A painter lifts a can of paint that weighs 48 Newtons a distance of 3 meters. How would you calculate how much work he does? (work = distance x force)

• 3m ÷ 48N

• 48N ÷ 3m

• 48N × 3m

• none of the above

Tags

NGSS.MS-PS3-4

The greatest amount of force is required to move the metal block up which inclined plane?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-2