Mechanical Advantage and Simple Machines

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?

• 1

• 10

• 100

• 1000

If a pulley system has a mechanical advantage of 4, what does that mean?

• This means that it is 4 times easier to lift this load.

• This means you only need a quarter of the effort to lift the load.

• For example, if you lifted 100 kg, it would only take 25 kg of effort.

• All of the above

What is the mechanical advantage of the lever ?

• 0.5

• 2

• 3

• 6

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NGSS.MS-ETS1-1

Jeff is a landscaping contractor and lifts a rock weighing 600 Newtons by wedging a board under the rock. Jeff weighs 150 Newtons and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?

• 0

• 2

• 4

• 0.25

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NGSS.MS-PS2-2

Mechanical advantage is a measure of how much a machine multiplies the input

• efficiency.

• force.

• power.

• work.

The greater the mechanical advantage of a machine, the more input distance decreases.

• False

• Partially true

• Depends on the machine

• True

This 2000 N weight is raised 1 meter by pulling 4 meters of rope. What force was required to pull the rope?

• 500 N

• 1000 N

• 2000 N

• 8000 N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A 10 Newton effort force is required to lift a 10 kg box just off the ground. What is the effort required to lift the box off the ground using a 3m long lever? [The fulcrum is placed 0.5m from the box.]

• 0.5 N

• 2.0 N

• 5.0 N

• 8.0 N

Tags

NGSS.MS-ETS1-1

If the small gear is driving the large gear, what is happening to the torque (TRACCION)?

• Torque is increasing

• Torque is decreasing

• Torque remains constant

• Not enough information to answer the question

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

A compound gear train is composed of four gears: A, B, C, and D. Gear A has 12 teeth. Gear B has 24 teeth and shares a shaft with gear C, which has 8 teeth. Gear C is meshed with gear D, the output gear. Power is supplied at gear A with 200 ft. lb of torque and is traveling at 400 rpm. With a torque output of 2400 ft lb, how many teeth should gear D have?

• 144

• 12

• 24

• 48

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2