Work and Power
Scientific meaning of work.
What is forces and motion?
page.87
IMA=Lin/Lout
What is ideal mechanical advantage of a lever?
page.105
A doorknob.
What is a wheel and axle?
page.106
P=W/t.
What is equation for power?
page.91
The output force is greater than the input force.
What is the output force acts over a shorter distance?
page.97
Pushing a bicycle, and it doesn't not move.
What is no work is done?
page.87
Length of the output arm.
What is the radius of the axle?
page.107
Doing work using only one movement.
What is a simple machine?
page.103
The SI unit of power.
What is the watt?
page.91
When the output force acts over a longer distance than the input force.
What is the output force is less than the input force?
page.97
The rate at which energy is transferred to an object.
page.91
Mechanical Advantage of an inclined plane equals its length divided by its height.
What is ideal mechanical advantage of inclined planes?
page.108
A slide.
What is a inclined plane?
page.107
W=Fd.
What is equation for work?
page.88
Equal output and input forces.
What is acts over equal distances?
page.97
You must know these to calculate work.
What is force and distance?
page.88
What is IMA=rwheel/raxle?
page.107
Combination of fixed and movable pulleys that work together.
What is a pulley system?
page.109
Priya uses a nutcracker to break an almond. She applies a force of 22 N on the nutcracker. The force exerted on the almond is 66 N. Find the mechanical advantage of the nutcracker.
What is 3?
page.98
Changing the size of a force, changing the distance a force acts, and change the direction of a force.
What is machines making work easier?
page.97
Calculate work when forces are in different motion.
What is only the horizontal part of the force is used in the equation?
page.89
Increasing the length and decreasing the height of an inclined plane.
What is increasing its ideal mechanical advantage?
page.108
Determines the class of lever.
page.104
Rea does 60 J of work with a lever. The output work of the lever is 55 J. Find the efficiency of the lever.
What is 91.7%?
page.99
Someone pulling a bail out of a board using a hammer.
What is you exert an input force on the hammer. The hammer exerts an output force on the nail?
page.96