Lesson 1-2 Key Terms
What is Power?
Power is the rate at which work is done.
What is fulcrum?
Fulcrum is the point about which a lever pivots, or rotates.
How do you calculate work?
W= f*d
What is a machine that does work using only one movement?
A simple machine
A force that does not make an object move does not....
Work
What is transfer?
Transfer is to move from one place to another.
Inclined Plane?
An inclined plane is a flat, sloped surface.
Measure of Distance
Meters
What is a grooved wheel with a rope or cable wrapped around it.
A pulley.
What does a machine do?
Change your input force into an output force
What is work?
Work is the transfer of energy to an object by a force that makes an object move in the direction of force.
A screw is an inclined plane wrapped around a cylinder.
What is force calculated in?
Newtons
What is a made up bar that pivots about a fixed point?
A lever
Is a crowbar a simple machine?
yes
What is efficiency?
Efficiency is the ratio of output work to input work.
What is a wedge?
A wedge is a sloped surface that moves
SI Unit for work
Joules.
What is an inclined plane wrapped around a cylinder?
A screw
The output energy work done by a machine never exceeds the input work due to....
Friction
What is mechanical advantage?
Mechanical advantage is the ratio of output force to input force.
What is a wheel and axle?
A wheel and axle is something made up of a shaft , or axle, attached to the center of a wheel such that both rotate together.
Say you´re carrying a bad of groceries. If the force is 2 and the distance is 6 , what is the work?
The work is 12
What is made up of a shaft, or axle, attached to the center of a wheel such that both rotate together?
A wheel and axle
How does a machine work?
A machine can change the size of the force, the distance the force acts, and the direction of the force.