Simple Machines and Mechanical Systems

The formula for calculating the Mechanical Advantage is...

• Output Force / Input force = MA

• Input force / Output force = MA

• Direction x Angle = MA

• Angle x Speed = MA

How does an inclined plane help us do work?

• Allows us to move heavy objects using a smaller force

• Magnifies input force

• Can be used to increase the size of the force or the speed

• By minimizing any force lost because of friction/slippage. 

Tags

NGSS.MS-ETS1-1

What two forces are involved when a machine is used to do work?

• push & pull 

• input force & output force 

• gravity & buoyancy 

• weight & gravity

If the output (driven) gear is smaller than the input (driving) gear, the speed will

• increase

• be constant

• decrease

• there is not enough information

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

To increase the mechanical advantage of a lever

• make sure the fulcrum is in the middle of the lever

• move the fulcrum closer to the load

• move the fulcrum closer to the person

• use a bigger fulcrum

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?

• 2N

• 5N

• 10N

• 15N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Jeff is a landscaping contractor and lifts a rock weighing 600 Newtons by wedging a board under the rock. Jeff weighs 150 Newtons and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?

• 0

• 2

• 4

• 0.25

Tags

NGSS.MS-PS2-2

What is the mechanical advantage of the lever shown?

• 10

• 0.1

• 50

• 250

What is the efficiency of the following simple machine?

• 85%

• 3%

• 33%

• 39%

Tags

NGSS.MS-ETS1-1

Identify this simple machine

• Lever

• Wheel & Axle

• Inclined Plane

• Screw