SIMPLE MACHINES AND MECHANICAL ADVANTAGE

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

A lever type 1 with a length of 1.2 meters has an input arm length of 80 cm are used to lift a fallen tree, which has a weight of 480 N.

What is the input force that will begin lifting the tree off the ground?

• 32,000 N

• 320 N

• 240 N

• 960 N

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.B.3

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

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

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

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.SSE.A.1

Which gear train would you use to apply the force necessary to ride up a hill?

• A

• B

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

A simple gear train is composed of three gears. Gear A is the driver and has 60 teeth, gear B has 40 teeth, and gear c has 15 teeth. If the output at gear C is 300 RPM, what is the input torque at gear A?

• 600 RPM

• 1200 RPM

• 75 RPM

• 2400 RPM

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2

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

In a pulley system, pulley A is moving at 600 rpm and has a diameter of 12 in. Three pulleys B, C, and D, all of different sizes are attached to a single output shaft. Speed and torque output are changed within the system by moving the drive belt between pulleys B, C, and D. A speed of 1200 rpm is required when the drive belt is connected to pulley B. What is the diameter of pulley B?

• 2

• 4

• 6

• 8

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2