Brain Pop Simple Machines

Which of the following is an example of a simple machine?

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Where on a bicycle might you find a pulley?

• gears

• handlebars

• seat

• tires

Let's say you were using a single-pulley system to lift a flag up a flagpole. If you wanted to raise the flag 10 meters into the air, how far would you have to move the rope?

• 5 meters

• 10 meters

• 20 meters

• 50 meters

A pulley contains which other simple machine?

• screw

• inclined plane

• lever

• wheel and axle

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

• actual force

• resistance force

• effort force

• strong force

Tags

NGSS.MS-PS2-4

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

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

• effort force is smaller than the resistance

• effort is larger than the resistance force

• effort force outweighs the resistance force

• effort and resistance forces are equal

What objects can't you lift if you're 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

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

• effort force is twice as large as the resistance

• effort force is one-half the resistance force

• effort force is three times as large as the resistance force

• resistance and effort forces are equal