Unit 3 Exam Extra Credit

Work is being done when a force is applied.

• is exerted while pulling a bag across the floor

• is exerted by one team in a tug of war when there is no movement.

• acts vertically on a cart that can only move horizontally.

• of someone just standing on the planet Mars

Tags

NGSS.MS-PS2-2

What is the formula for calculating work done on an object?

• Work = Force x Distance

• Work = Mass x Acceleration

• Work = Force / Time

• Work = Velocity x Time

Tags

NGSS.MS-PS3-5

Which of the following is an example of a simple machine?

• Lever

• Car

• Door

• Bike

Which of the following is NOT a type of simple machine?

• Pulley

• Inclined Plane

• Screw

• Book

What is the role of a fulcrum in a lever?

• It acts as the pivot point

• It is an energy source

• It causes more gravity

• It looks cool

Which of the following best describes an inclined plane?

• A flat surface set at an angle to lift objects

• A wheel with a rope around it

• A bar that pivots on a fulcrum

• A spiral wrapped around a cylinder

A box is lifted vertically 45 m by a crane and held there. The box has a weight of 1000 N. How much work is being done in holding the box in this elevated position?

• 450 J

• more than 45 J

• less than 450 J

• no work is being done

How much work was done on a stationary wall if you push on it with 30 N?

• 10 J

• No work is being done

• 80 J

• 160 J

Using a lever, Ms. Rumell is able to lift a 15,000 N elephant (don't ask how she got it) off the ground with a force of 1000 N. What is the mechanical advantage of the lever?

• 1

• 15

• 150

• 1500

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

In order to lift a box 1 meter to put it in your trunk, you push it up a 4 meter ramp. The box is filled with science books and weighs 200 Newtons. Determine the mechanical advantage of the ramp.

• 0.25

• 4 N

• 0.25 N

• 4

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2