Simple Machine Practice 1

What is the formula to calculate mechanical advantage for a wheel and axle?

• Mechanical Advantage = Radius of Wheel / Radius of Axle

• Mechanical Advantage = Circumference of Wheel / Circumference of Axle.

• Mechanical Advantage = Radius of Axle / Radius of Wheel.

• Mechanical Advantage = Diameter of Wheel / Diameter of Axle.

Tags

NGSS.MS-ETS1-1

A wheel and axle has a radius of 10 cm and a radius of 5 cm respectively. What is the mechanical advantage of the system?

• 10

• 0.5

• 25

• 2

A wheel and axle has a radius of 10 cm and a radius of 5 cm respectively. What is the mechanical advantage of the system?

• 10

• 0.5

• 25

• 2

In a wheel and axle, if the wheel radius is 9 meters and the axle radius is 0.3 meters, what is the mechanical advantage?

• 3

• 2.7

• 0.03

• 30

Tags

NGSS.MS-PS2-2

1. A _________is a simple machine with a fulcrum and a rigid bar.

• Pivot
• Lever
• Wedge

Suzy finds that a lot of effort is needed to lift the load in the above diagram. How can Suzy use less effort to lift up the load?

• Use her leg to press.

• Move the position of the fulcrum perpendicular to the effort

• Move the fulcrum behind the load

• Move the fulcrum nearer to the load

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

3. Which type of lever is this?

• First Class Lever
• Second Class Lever
• Third Class Lever

A wheelbarrow is an example of a:

• 1st class lever
• 2nd class lever
• 3rd class lever

Using a lever, Joe is able to lift a 10,000 N car off of the ground. The input arm of the lever is 12 meters. The output arm distance carrying the load is 1.3 meters. What is the mechanical advantage of the lever?

• 9.2

• 15.6

• 0.11

• 10,000

What is the ideal mechanical advantage of a lever with a output arm of 3 m and an effort (input) arm of 12 m?

• 4
• 0.25
• 15
• 0.5