POE - Unit 1.1 Test Review

Which of the following is an example of a 2nd class lever?

• wheel barrow

• see saw

• fishing pole

• none of these are examples of a 2nd class lever

Which of the following is an example of a 3rd class lever?

• fishing pole

• wheel barrow

• see saw

• none of these

You can find the MA of a system by which of the following:

• Output distance divided by resistance force

• Output force divided by effort force

• input force divided by resistance force

• effort distance divided by input distance

Tags

NGSS.MS-PS2-2

A force of 20 lbs is applied to a 0.5-foot diameter wheel. The wheel is turning a ¼ inch diameter axle. How much mechanical advantage does the wheel provide?

• 2

• 24

• 480

• 48

Tags

NGSS.HS-PS2-1

If the input (driver) gear is 30 teeth and the output (driven) gear is 40 teeth, what is the gear ratio?

• 1.33

• 0.75

• 120

• 1.2

Find the mechanical advantage of a wheel and axle system if the wheel has a radius of 2.5 feet and the axle has a radius of 6 inches if the force is put on the axle.

• 0.2

• 0.42

• 2.4

• 5

What is the weight (resistance) you could lift using a first-class lever if you apply 10 lbs of effort? The effort arm is 10 feet and the resistance arm is 4 feet.

• 25

• 0.25

• 0.4

• 4

Tags

NGSS.HS-PS2-1

Suppose you need to place a 17-kg block of ice onto the shelf of a freezer 200 cm high. The ice will soon start melting, so you must place the ice in the freezer in 5 s. How much power is used to lift the ice into the freezer?

• 170.15 W

• 66.7 W

• 6.8 W

• 680 W

Tags

NGSS.MS-PS3-4

The figure shows a belt driven system. Pulley B, which has a diameter of 9 inches, is being driven by pulley A, which has a diameter of 2 inches. If pulley A is spinning at 30 RPMs, then how fast is pulley B spinning?

• 6.7 RPMs

• 135 RPMs

• 2.7 RPMs

• 60 RPMs

Tags

NGSS.MS-PS2-2

A force in a circular direction is called

• rotary motion.

• torque.