Pulley

Which of the following are examples of simple machines?

• calculator

• door knob

• flag pole

• fireplace

Where on a bicycle might you find a pulley?

• the gears

• the handlebars

• the seat

• the tires

Let's say you wanted to use a pulley to lift a flag up a flagpole. If you wanted to lift the flag 10 meters in the air, how far would you have to move the rope?

• 5 meters

• 10 meters

• 15 meters

• 20 meters

A pulley contains which other simple machine?

• a screw

• an inclined plane

• a lever

• a wheel and axle

What is the effort force?

• the force that you apply to a simple machine

• the weight of the load that the simple machine moves

• the distance that the simple machine moves the load

• the amount of effort it takes to construct a simple machine

What is the force exerted by the load being lifted called?

• the actual force

• the resistance force

• the effort force

• the strong force

Tags

NGSS.HS-PS2-1

In a simple pulley, what is the relationship between the effort and resistance forces?

• the effort force is smaller than resistance force

• the effort force is larger than resistance force

• the effort force outweighs the resistance force

• they are equal

What objects can't you lift if you are using a single-pulley system?

• very large objects

• oddly-shaped objects

• very tall objects

• objects that are heavier than you

Let's say you had a pulley system with a mechanical advantage of 3. If you want to lift a boulder 10 meters off the ground, how far would you have to pull the rope?

• 3 meters

• 10 meters

• 30 meters

• 300 meters

Tags

NGSS.MS-PS2-2

It's easier to lift heavy objects with a double-pulley system because:

• The effort force is twice as much as the resistance force.

• The effort force is one-half as much as the resistance force.

• The effort force is three times as much as the resistance force.

• The resistance force and effort force are equal.