1
Define Energy
The ability to do work
What are two forms of potential energy?
Gravitational potential energy and elastic potential energy
Name 3 forms of energy other than Mechanical Energy?
Name at least 3 of the following: Thermal Energy, Chemical Energy, Electrical Energy, Electromagnetic Energy, Sound Energy, Nuclear Energy
The total mechanical energy of an object is the sum of which two things?
Potential Energy and Kinetic Energy
Which Law states that "Energy cannot be created nor destroyed; it can only be converted from one form to another or transferred from one object to another"
Law of Conservation of energy
1/2 X m X v2
What is the formula for Potential Energy?
m X g X h
What does g stand for in the Potential Energy Formula?
the acceleration due to gravity
9.8 m/s2
A "N * m" (a Newton times a meter) is equal to which unit?
There are how types of simple machines? Name 3
6; Inclined Plane, Wedge, Pulley, Wheel & axle, Lever, Screw
Define Power
The amount of work done each second
True or False: If a force does not act in the direction an object is moving, it does NO work on the object
True
What is the formula for Power? (Define the symbols)
P = W/t (Power equals Work divided by time)
You lift a book from the floor to a bookshelf 2 feet above the ground. You exert 20 newtons of upward force to lift the book. How much work, in joules did you do?
W = F X d = (40 J)
Turning on a toaster is an example of which kind of energy?
Electrical Energy
1 hp = how many watts? (hp = Horsepower)
746 watts
The vibrations of a beating drum are examples of which kind of energy?
Sound Energy
Per Einstein, E = ?
mc2
The Power unit was named after the Scottish scientist named?
James Watt
A 400 lb Rock is rolling down a hill at a speed of 5 m/s. How much kinetic energy in joules, does the rock have?
(KE = 1/2 X m X v2)
(0.5)(400 lb)(5m/s)2
= 5000 J
E = mc2
What does c stand for?
The speed of light
The process that releases energy by splitting atomic nuclei apart is called?
Nuclear fission
In experiment 8.1 (last week), we did five trials of each stretch length. We did this to reduce what?
Experimental Error