Simple Machines

Identify this simple machine

• Lever
• Wheel & Axle
• Inclined Plane
• Screw

Two examples of a pulley...

• knife & axe blade
• lightbulb & screw
• flagpole hoist & window blinds
• catapult & teeter totter

Which of the following does a simple machine do?

• allows the users to apply less force over a longer distance
• reduce the amount of force needed to do work
• change the direction of the applied force
• all of the above

Which is an example of someone using a simple machine to do work?

• a boy runs across a football field
• a banker counts money
• a mother pushes a stroller up a ramp
• a girl eats a sandwich

This device

• wedge
• lever
• incline plane
• wheel and axle

The fixed point on the lever is called 

• load
• resistance
• bar
• fulcrum

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

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?

• 1
• 10
• 100
• 1000

The mechanical advantage of this inclined plane is.....

• 2.4
• 3.4
• 4.4

Amount of work WASTED by a machine can be calculated by...

• friction

• efficiency

• power

• work