Which is the following is an example of work, to a  scientist? 

• solving a mental math problem
• carrying a book across the room
• pushing against the floor
• lifting a chair of the floor?

A simple machine is a device that helps to reduce the amount of _____ required to work.

• force
• energy
• work

____ is done when a force is applied over a distance.

• energy
• work
• force

A _____ is a fixed bar  that us free to move around a fixed point known as a fulcrum.

• pulley
• inclined plane
• lever

A ______ is a grooved wheel with a rope running along the groove.

• lever
• pulley
• screw

A _____ pulley only changes the direction of the force.

• movable
• fixed
• alternate

A sloping force, like a ramp, that reduces the mount of force required to lift an object.

• screw
• wheel and axle
• inclined plane

Tags

NGSS.MS-PS2-2

How can an incline plane reduce the amount of force required to lift an object?

• increase the length of the ramp
• increase the height of the ramp
• decrease the length of the ramp

Tags

NGSS.MS-ETS1-1

A simple machine that can split things apart or hold a door open.

• wedge
• screw
• lever

A simple machine that is made up of an incline plane wrapped around a cylinder. It is often used to hold things together.

• lever
• screw
• wedge