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
