Work andPower

Normal Force: 200N

Friction: 50N

Applied force: 0.0N

Weight: 250N

Weight Perpendicular to the plane 200N

W II: 150N

A free body diagram of a brick on an inclined plane is shown below. What is the coefficient of friction, µ

?

• 0.125

• 1.25

• 0.25

• 0.5

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which wheel and axle would allow a load to be dragged with less force?

• Wheel and axle A.

• Wheel and axle B.

• Both devices would require the same amount of force

• Not enough information.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A mechanic is trying to loosen a nut with a wrench, but it is stuck. What could the mechanic do to help loosen the nut?

• Use a heavier wrench.

• Use a lighter wrench.

• Use a longer wrench.

• Use a shorter wrench.

Tags

NGSS.MS-PS2-2

In a lever, what happens if you decrease the distance between the fulcrum and the load?

• You have to decrease the length of the lever

• You have to use more force to move the load

• You can use less force to move the load

• You have to increase the height of the fulcrum

What defines a first-class lever?

• The load is exactly centered between the fulcrum and the lever

• The fulcrum is between the effort and the load

• The effort is between the fulcrum and the lever

• The effort is between the fulcrum and the load

How is a class 3 lever different from class 1 and class 2 levers?

• A class 3 lever makes the job easier, but decreases the movement of the load

• A class 3 lever makes the job easier, but increases the movement of the load

• A class 3 lever makes the job harder, but decreases the movement of the load

• A class 3 lever makes the job harder, but increases the movement of the load

A device that transmits or modifies force or motion

• Slope and Rise
• Load
• Simple Machine
• Mechanical Advantage

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

Tags

NGSS.MS-ETS1-1

Two round gears with teeth on the outside are meshed together and spinning. Which of the following will always be true?

• They will spin in opposite directions

• They will spin at different rotational speeds

• They will have different torque outputs

• They will move without any friction