machines

A simple machine that consists a rigid bar that pivot about a fixed point

• lever
• pulley
• wheel and axle
• fulcrum 

Stairs

• wedge
• pulley
• inclined plane
• wheel and axle

Tags

NGSS.MS-ETS1-1

The input work is the product of

• load and effort

• effort and effort distance

• load and load arm

• effort distance and load distance

What is effort (input) force?

• the force required by a machine in order to accomplish work (the force you put on the machine)
• the force which an effort force must overcome in order to do work on an object via a simple machine.
• the force the machine exerts on a object
• the output work times the input distance

Tags

NGSS.MS-PS2-2

What type of simple machine is shown here?

• Single fixed Pulley

• Wheel and Axle

• Single movable pulley

• block and tackle

Which simple machine would be best for opening a door?

• Pulley
• Wedge
• Wheel and axle
• Inclined plane

Tags

NGSS.MS-ETS1-2

The fixed point on the lever is called 

• load
• resistance
• bar
• fulcrum

A boy uses this simple machine to lift a load. How does this machine help the boy to do work?

• by changing the direction

• by reducing total work

• by decreasing distance

• by reducing effort force

A single fixed pulley has MA................

Which of the following is NOT one of the things a machine can do?

• Changes the amount of force required.

• Changes the distance over which the force is exerted.

• Changes the direction of the force.

• Changes the amount of work done.