Simple Machines

A wheelbarrow is an example of

• First Class Lever
• Second Class Lever
• Third Class Lever
• Fourth Class Lever

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

In a first class lever, the _____ is in the middle.

• Effort
• Fulcrum
• Load
• Machine

Tags

NGSS.MS-PS2-2

A door stop is an example of a

• Screw
• Wedge
• Lever
• Inclined Plane

Tags

NGSS.MS-PS2-2

How much work is produced when 350 N is used to move a car 5 m (W=Fd)?

• 70 J
• 1750 J
• 355 J
• 175 J

What is effort (input) force?

• the force one exerts on a 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

What is mechanical advantage?

• The advantage a machine has over a bicycle

• A measure of how much a simple machine reduces work

• A measure of when is the best time to use a simple machine

• the number of times a machine increases input force

Tags

NGSS.MS-PS2-2

What is the mechanical advantage of this pulley?

• .5

• 1

• 1.5

• 2

Tags

NGSS.MS-ETS1-1

What is the mechanical advantage of this pulley?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-ETS1-1

A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds.  How much power was used?

• 360 W 
• 60 W
• 3600 W
• 600 W

If you push a coffee mug 1.4 m using a force of 5 N, the work done on the mug is?

• 7 J
• 6 J
• 8 J
• 9 J