Work, Energy, and Machines

A wheel is a modification of a(n)

• screw
• lever
• inclined plane
• wedge

Which of the following is not an example of work?

• an ice hockey puck laying on an ice rink
• ship movement that causes ripples in the water
• a man pushing a heavy box across the floor
• a magnet repelling a compass needle

Tags

NGSS.MS-PS3-5

Which of the following is not an inclined plane?

• wrench
• axe
• chisel
• ramp

In a first-class lever, ...

• the effort is located between the fulcrum and the resistance
• the fulcrum is located at the end of the lever
• the resistance is located between the fulcrum and the effort
• the fulcrum is located between the effort and the resistance

A device in the shape of two inclined planes placed bottom to bottom is called a(n) ...

• incline
• wedge
• wheel and axle
• block and tackle

First- and second-class levers amplify effort or force. Third-class levers amplify ...

• friction
• distance
• pitch
• power

A simple machine that consists a rigid bar that pivots on a fixed point

• lever

• pulley

• wheel and axle

• fulcrum

An axe is an example of a

• pulley

• inclined plane

• screw

• wedge

When force is used to move an object across a distance, this is called...

• effort

• power

• energy

• work

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following does a simple machine do?

• allows the users to apply less force over a longer distance
• reduce the amount of force needed to do work
• change the direction of the applied force
• all of the above