Physical science Ch.5

Type of machine made up of two or more simple machines

Compound

What is ideal mechanical advantage?

Ideal mechanical advantage is the mechanical advantage of and machine without friction

A measure of the amount a machine multiplies a force is its ________ advantage

Mechanical

W out stands for

Output work

Power is calculated by

P=w/t

t stands for

Time

Exertion of a force through a distance

Work

W stands for

Work

Two wheels of different sizes that rotate together

wheel and axle

W stands for

work

When a force is applied through a distance _______ is done

work

Work can be done by simple machines such as

1.) pulley 2.) lever 3.) wedge 4.) screw 5.) wheel and axel 6.)inclined plane

a system of Pulleys is called a

Block and tackle

It's fixed pulley changes the ______ of a force

Direction

d stands for

Distance

Measure of how much work put into a machine is changed to useful work put out by the machine

Efficiency

Efficiency is a % calculated by

Efficiency%= Wout/Win times 100 = J

In the equation P=E/t E stands for

Energy

A machine makes work easier by changing the size or direction of the ____ exerted on an object

Force

F stands for

Force

Push or pull

Force

Work = ____ times _____

Force times distance

Two wheels of different sizes with interlocking teeth along their circumference

Gear

IMA of slope is

IMA = length of slope/ weight of slope

IMA lever is calculated by

IMA L =length input arm/length output arm

Ideal mechanical advantage is calculated by

IMA=din/dout

Sloping surface used to raise objects

Inclined plane

Screws in wedges are types of

Inclined planes

In the equation Win =W out Win stands for

Input work

Bar that is free to pivot about a fixed point

Lever

Classify each type of simple machine

Levers- Pulley, wheel and axle, gear Inclined planes - screw, wedge

Mechanical Advantage is calculated by

MA= Fout/Fin

A device that makes work easier is a

Machine

What are two ways that machines make work easier?

Machines can make work easier by increasing the force that can be applied to an object. A second way that machines can make work easier is by increasing the distance over which a force can be applied.

The number of times a machine multiplies the effort force is the

Mechanical advantage

The work done by machine is the _____work

Output

In the equation P = W/t P stands for

Power

Distance from center of a circle to its edge

Radius

Inclined plane wrapped around a cylindrical post

Screw

How does a crowbar used to remove the top of a box change the direction of the force?

To pry the lid off a wooden crate with a crowbar you'd slip the end of the crowbar under the edge of the crate lid and push down on the handle. By moving the handle downward you do work on the crowbar. As the crowbar moves it does work on the lid lifting the crowbar.

Amount of work is calculated by

W=Fd

An inclined plane with one or two sloping slides

Wedge

Simple machines made up of two inclined planes

Wedge

Used with an axle

Wheel

A door knob is an example of

Wheel and axle

The force that is applied to the machine is the blank force

effort

A force that opposes motion

friction

Fixed point on which a lever rotates

fulcrum

Machine in which input work is equal to output work is an ____ machine

ideal

The work done to a machine is _____ work

input

Work can be made easier by using ____ that ___ force

machines that multiply

Grooved wheel with a rope running along the groove

pulley

The force applied by machine to overcome another force is the ______ force

resistance

A device that does work with only one movement is a ______ machine

simple

t stands for

time