simple machines and work and energy

Identify this simple machine

• Lever
• Wheel & Axle
• Inclined Plane
• Screw

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

• force
• energy
• work

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

• energy
• work
• force

What type of simple machine has a ramp that makes it easier for a heavy object to be moved up or down?

• lever

• pulley

• inclined plane

• wedge

Mechanical Advantage (MA) is:

• Ratio of the magnitude of the resistance and effort forces
• Ratio of distance traveled by the effort and the resistance force
• All of the above
• None of the above

If MA is greater than 1:

• Proportionally less effort force is required to overcome the resistance force
• Proportionally greater effort force is required to overcome the resistance force
• Proportionally less effort distance is required to overcome the resistance force
• MA cannot be greater than 1

An inclined plane is 15 meters long and raises 3 meter high.  If you want to push a 20 N box up the inclined plane, how much effort force will you need? Remember, FeDe = FrDr

•  900 N
• 4 N
• 2.25 N
•   100 N

Tags

NGSS.HS-PS2-1

Mrs. Cruz wants to lift a bag of chocolates in a crane vending machine.  The chocolate weighs 2 lb.  When she pulled the crane with her force sensor, she saw that she put in 1.5 lb of force effort.  What is the mechanical advantage of the crane?

• 1.33
• 0.75
• 2
• 1.5

What is the fixed point around which a lever is free to turn?

• fulcrum
• resistance
• effort
• lever

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever (MA=Output Force/Input Force)?

• 1

• 10

• 100

• 1000