Which of these activities would require the least effort?

• Walking up a short ramp with a steep incline.

• Walking up a long ramp with a steep incline.

• Walking up a long ramp with a slight incline.

• Bypassing the ramp and jumping directly onto a platform.

Tags

NGSS.MS-PS3-5

What is a lever?

• Any piece of metal that bends.

• Any bar or a rod that's set up to tilt on a fulcrum.

• Any bar that's used to lift a load.

• Any bar that's attached to a pulley.

Simple machines make work easier by increasing what?

• The distance over which work is done.

• The force needed to do work.

• The time required to do work.

• The acceleration of a massive object.

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?

• 600 Joules

• 660 Joules

• 900 Joules

• 1200 Joules

Tags

NGSS.MS-PS3-4

800 joules of work were done with a force of 200 newtons. Over what distance was the force applied?

• 40m

• 20m

• 4m

• 2m

An ax, a zipper, and a front tooth are examples of a simple machine called a

• Lever

• Wedge

• Screw

• Inclined Plane

In which of the following situations do your arms do work on books?

• holding a heavy stack of books while standing

• carrying a heavy stack of books

• picking up a pile of books from the floor

• dropping a stack of books onto a table

Force x Distance =

• Energy

• Power

• Work

• Speed

Tags

NGSS.MS-PS3-5

Two students are on a seesaw. Student B is bigger than student A, so the seesaw is not balanced. How could the seesaw be balanced?

• Student A should move toward the center while student B stays where he is.

• Student B should move toward the center, while student A stays where he is.

• Student B should move toward the end, while Student A should move toward the center.

• Both Student A and Student B move toward the center.

Tags

NGSS.MS-PS2-2

The mechanical advantage tells you the number of times a machine increases the

• output force

• input force

• net force

• stable force

Tags

NGSS.MS-ETS1-1