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89 Cards in this Set

  • Front
  • Back
What is stored energy called?
Potential energy
What kind of energy is in an automobile battery?
Potential energy
What is energy due to an object's position relative to the ground called?
Gravitational potential energy
The kinetic energy of an object depends on its:
a. mass and speed
b. mass and height
c. height and speed
d. mass and potential energy
Mass and speed
The law of conservation of energy states that energy can:
a. be used up
b. change
c. be created
d. be destroyed
Change
What kind of energy does a diver standing on the end of a platform have?
Gravitational potential
What are kinetic energy and potential energy measured in?
Joules
A working pendulum:

a. has kinetic energy
b. has gravitational
potential energy
c. converts potential energy into kinetic energy
d. has potential energy
Converts potential energy into kinetic energy
The water at the top of the Hoover Dam:

a. has kinetic energy
b. has gravitational
potential energy
c. converts potential energy into kinetic energy
d. has potential energy
Has potential energy
A bullet passing through an apple:

a. has kinetic energy
b. has gravitational
potential energy
c. converts potential energy into kinetic energy
d. has potential energy
Has kinetic energy
A diver standing on the platform:

a. has kinetic energy
b. has gravitational
potential energy
c. converts potential energy into kinetic energy
d. has potential energy
Has gravitational potential energy
A roller coaster in motion:

a. has kinetic energy
b. has gravitational
potential energy
c. converts potential energy into kinetic energy
d. has potential energy
Converts potential energy into kinetic energy
A girl on a swing (moving):

a. has kinetic energy
b. has gravitational potential energy
c. converts potential energy into kinetic energy
d. has potential energy
Has kinetic energy
A skier on the top of the hill:

a. has kinetic energy
b. has gravitational potential energy
c. converts potential energy into kinetic energy
d. has potential energy
Has potential energy
An instrument that makes work easier
Machine
What are the 2 types of work involved in using a machine?
Work input and work output
What is the force that is applied to the machine - effort force?
Work input
What is the work done by the machine?
Work output
What is the force which opposes the effort force?
Resistance force
What kind of force is the weight of an object being moved?
Resistance force
What is the measurement of how much input is available for work output?
Efficiency
Is work output more or less than work input?
Less
Why is work output always less than input?
Some degree of work is always wasted
An ideal frictionless machine would have how much efficiency?
100%
Can efficiency be greater than 100%
No
Name 3 ways machines help do work
Increase the force applied to an object
Change the direction of a force
Increase the distance through which a force moves
What is the formula for efficiency?
E = useful work output x 100%
--------------------
work input
How is the answer for efficiency expressed?
% = as a percentage
What is the number of times a machine multiplies the effort force?
Mechanical advantage
What is the formula for mechanical advantage?
resistance force/effort force
Name the 6 types of simple machines
inclined plane
wedge
screw
lever
pulley
wheel and axle
What kind of machine does work in one movement?
Simple machine
How many kinds of simple machines are there?
6
What machine has a straight slanted surface that connects one level to another?
Inclined plane
What machine is made up of 1 or 2 slanted forces or inclined planes?
Wedge
What machine is made up of an inclined plane wrapped around a bar or cylinder, to form a spiral?
Screw
A lid on a jar or a nut and bolt are examples of what kind of simple machine?
Screw
What machine is a rod or bar that pivots around a fulcrum?
Lever
What is the point at which a lever turns or pivots?
Fulcrum
What is the force exerted on a lever?
Effort force
What is the force exerted against the lever?
Resistance force
A screwdriver used to open a paint can is an example of which kind of lever?
1st class
A nutcracker and wheelbarrow is an example of what kind of lever?
2nd class
A baseball pitcher or using a fishing pole is an example of what kind of lever?
3rd class
Resistance and effort are on opposite sides of the fulcrum is what kind of lever?
1st class
The fulcrum is at the end of the lever is what kind of lever?
2nd class
The fulcrum is at one end with the effort in the middle is what kind of lever?
3rd class
What is a rope, cord, or chain wrapped around a grooved wheel called?
Pulley
What kind of machine would be used to lift a large amount of weight?
Pulley
What kind of machine is made of an axle, which is a rod or shaft, and an attached wheel?
Wheel and axle
A door knob, bicycle, and Ferris wheel are examples of what?
Wheel and axle
What is a combination of 2 or more simple machines?
Compound machine
A washing machine, VCR, vacuum are examples of what kind of machine?
Compound machine
What is the ability to do work called?
Energy
When an object or organism does work, what are they using?
Energy
When work is done on an object, what is given to the object?
Energy
When you kick a football, you give the ball some energy to mvoe
What are the 5 forms of energy?
Mechanical
Heat
Chemical
Electromagnetic
Nuclear
What kind of energy is associated with motion?
Mechanical
What kind of energy is caused by the internal motion of atoms?
Heat
What kind of energy is required to bond atoms together?
Chemical
What kind of energy lets moving electric charges have the ability to do work?
Electromagnetic
What kind of energy comes from the nucleus of an atom?
Nuclear
What kind of energy is blood flowing through blood vessels, wind, walking, hitting
Mechanical
What kind of energy causes changes in temperature?
Heat
What kind of energy is produced as particles move faster?
Heat
What kind of energy is released when bonds are broken?
Chemical
Light, xrays, radio waves, laser lights are examples of what kind of energy?
Electromagnetic
When the nucleus splits, nuclear energy is released in the form of what?
Heat energy and light energy
What do you call the energy of motion?
Kinetic energy
What does "kinetic" mean?
Motion
Kinetic energy depends on what?
An objects speed and mass
If the speed of an object doubles, what happens to kinetic energy?
It becomes 4 times greater
What is the equation for Kinetic energy?
KE = mass x velocity2 / 2
What is energy in an inactive or stored form called?
Potential energy
A stretched rubber band is an example of what kind of energy?
Potential energy
What do you call potential energy due to an object's position relative to the ground?
Gravitational Potential Energy
Gravitational potential energy depends on:
a. height and weight
b. height only
c. weight only
d. mass and velocity
Height and weight
What is the equation for Gravtitional potential energy
(GPE)?
GPE = weight x height
GPE = W x H
Changes in the forms of energy are called what?
Energy conversions
What is the most common change in forms of energy?
Changing potential energy to kinetic energy or kinetic energy to potential energy
What happens to the total amount of energy when energy changes forms?
It stays the same
A toaster changes electrical energy to what kind?
Heat
A blender changes electrical energy to what kind?
Kinetic
What do you call:
Energy can be transformed from form to another, but energy will never be created or destroyed when the energy transformation takes place
The Law of Conservation of Energy
What kind of energy causes ice cream to melt?
Heat energy
When you start a fire in a charcoal grill, what kind of energy is used?
Chemical energy
The sun's energy used by green plants is an example of what kind of energy conversion?
Light energy converted to chemical energy
What would be an example of kinetic energy continuously being changed back to potential energy?
Jumping on a trampoline
Potential energy is energy that is:
a. stored
b. in motion
c. not capable of doing work
Stored