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PS Ch 5 Rev

Review for Ch 5 Test

A slanted surface used to raise an object Inclined Plane
A device that does work with only one movement and changes the size or direction of a force is a___. Simple Machine
A bar that is free to pivot about a fixed point is a ___. Lever
The rate at which work is done. Power
_____ is transferred to an object when work is done. Energy
The output work of a machine compared to the input work is the ____ of the machine. Efficiency
The amount by which a machine multiplies an effort force is called the ____. Mechanical Advantage
Two inclined planes put together form a simple machine called a ______. Wedge
An inclined plane wrapped around a cylindrical post is a ____. Screw
A machine that changes only the direction of a force has a mechanical advantage of ___. One
What are two or more simple machines that work together called? Compound Machine
The unit of power is ____. Watts
The unit of work is ____. Joule
A lever with a mechanical advantage greater than one is used to ____. Increase Force
Three of the following machines are alike. Select the one that is different. Pulley, wedge, lever, wheel & axle. Wedge
A system of pulleys designed to multiply the effort force is called a ___. Block & Tackle
Two simple machines that are part of a bicycle are ____. Gear and Wheel & Axle
The mechanical advantage of a single fixed pulley is always one because___. they pulley changes only the direction of the effort force.
An example of a first class lever is a ____. Seesaw
An example of a second class lever is a ____. Wheelbarrow
An example of a third class lever is a ___. Baseball Bat
An example of a fixed pulley is a _____. Elevator
An example of a wheel & axle is a ____. pencil sharpener
An example of an inclined plane is a ____. Wheelchair ramp
An example of a screw is a _____. Spiral staircase
An example of a wedge is a ___. Axe
An example of a compound machine is a ___. Can opener
An inventor claims to have built a machine that can produce 120J of work with an input of 110J. Would you believe the inventor's claim. Why or why not? NO, because work output cannot be greater than work input.
Explain why adding oil to the moving parts of a machine can increase its efficiency. It would reduce the amount of friction produced.
List 3 ways machines make doing work easier. 1. Changes the direction of the force applied. 2. Increases the force that can be applied. 3. Increases the distance over which the force can be applied.
Is work being done if a person carries a heavy box across the room? Why or why not? NO, because the force applied to the book is upward and that is not the direction that the books are moving.
Created by: jjones87