Work & Power
the energy transferred to an object when an external force acts on the object to move it
Define Work
A car tire attached to the axel of a car is a obious example of ____
What is a wheel and axel
Define an inclined plane
What is a simple machine with a flat surface whose opposite ends are different heights
Define a lever
What is a simple machine that has a rigid bar with a pivot point
Define a wheel and axle
What is a simple machine with a wheel and rod running through its axis that acts as a pivot point
Give the SI unit for power
What is watt (W)
A seesaw is an exmaple of a _______
what is a lever
The mechanical advantage of an inclined plane is always greater than ___
what is One
How many classes of levers are there?
what is 3 classes
The mechanical advantage of of a wheel and axle can be any number greater than ______?
What is zero
Work and power are both...?
a) vector
b) scalar
What is Scalar
A slide is an example of a/an _____?
What is an inclined plane
There are the two other applications of inclined planes that are common but not as easily recognized they are ___ and ___
what are Wedge and screw
Define a torque
What is any force that tries to cause an object to rotate around its axis
A _____ is an example of a wheel and axle that consists of a wheel with teeth around its perimeter to do work while producing rotational motion
What is a gear
Define Ideal Mechanical Advantage (IMA)
What is the measure of mechanical advantage for an ideal machine
A doorknob is an example of ___
What is an wheel and axle
A wedge is used for
what is splitting materials
The point at which a lever turns, or pivots, is called the ___
what is Fulcrum
In the case of wheels on the car, the output force is reduced, meaning that the mechanical is ____
What is less than one
Define Actual Mechanical Advantage (AMA)
What is the measure of the mechanical advantage taking into account all mechanical losses sustained throughout the machine
A staircase is an example of
What is a inclined plane
A screw is used for
What is fastening
For a system to be in rotational equilibrium, the sum of the torques on the system must be _____?
In the case of the steering wheel, we get a multiplying of the force, but we have to move our hands farther than the axle in the steering column moves. In this case we have a mechanical advantage ___
What is greater than one