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Jaubert, Chapter 4, test 3/8
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Gravity
Mr. Jaubert said that there won't be anything about machines on the test so I took those parts out
Terms in this set (41)
the ratio of input work to output work (measured in percent)
efficiency
the ratio of the output force to input force
mechanical advantage
force applied through a distance
work
energy that is due to chemical bonds
chemical potential energy
energy that is stored by compressing or stretching an object
elastic potential energy
the ability to cause change
energy
energy that is due to the gravitational forces between objects
gravitational potential energy
energy due to motion
kinetic energy
energy that is stored due to the interactions between objects
potential energy
a region or set of regions around which a boundary can be defined
system
states that the energy cannot be created or destroyed
law of conservation of energy
the sum of the kinetic energy and potential energy of the objects in a system
mechanical energy
the rate at which energy is converted
power
What is the kinetic energy formula?
1/2 x mass x velocity squared
What is the potential energy formula?
mass x acceleration of gravity x height
What is the formula to find work?
force x distance
What is the formula for velocity?
acceleration of gravity x time
What is the formula to find distance?
1/2 x gravity x time squared
What is the formula to find time?
the square root of distance/4.9
1 pound= ___ kg
.45
1 ounce= _____ kg
.028
1 foot= ____ m
.3
1 kg= ____ pound
2.2
What is power measured in?
watts
What is potential energy measured in?
Joules
What is kinetic energy measured in?
Joules
What is work measured in?
Joules
What is mass measured in?
Kilograms
What is distance measured in?
meters
What is the difference between efficiency and mechanical advantage?
Efficiency is a measure of the output *work* to input
work
. Mechanica
work
ency is a measure of the output *work* to input *work*. Mechanical advantage is a measure of output *force* to input
force
force
ncy is a measure of the output *work* to input *work*. Mechanical advantage is a measure of output *force* to input *force*.
What is an example of both kinetic energy and potential energy together?
a pendulum
How would you find the final velocity from the problem:
A 10 kg ball was dropped and hit the ground in 1.1 seconds?
First, you would write out FV=at. Then, you would multiply 9.8*1.1
What is equivalent to a Newton Meter?
a Joule
Friction creates _______ energy.
thermal
In our formulas, height and ________ are the same thing.
distance
What unit is equivalent to Joules per second?
Watts
The amount of Kinetic energy a moving object has depends on its mass and its ________.
velocity
The potential energy of an object depends on its ____ and ______
mass and height
Energy stored in foods and fuels is ________ potential energy
chemical
The law of ____________ __ ______ states that energy cannot be created or destroyed
conservation of energy
You convert kinetic energy into thermal energy when you rub two sticks together because of _________
friction
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