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Chapter 15 - Section 15.1 ad 15.2 REVIEW
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TRUE or FALSE: Einstein's equation, E=mc², suggests that mass and energy together are conserved in the universe.
True
What type of energy? Kinetic, potential or both: A vibrating guitar string.
Both
What type of energy? Kinetic, potential or both: A car driving on a flat road.
Kinetic
What type of energy? Kinetic, potential or both: A skier poised to take off at the top of a hill.
potential
What type of energy? Kinetic, potential or both: A descending roller coaster car.
Both
What type of energy? Kinetic, potential or both: A stationary wind-up toy with a compressed spring.
potential
What type of energy increases as the pole bends before it propels a pole-vaulter up into the air.
elastic potential energy
TRUE or FALSE: Frictional forces enable a pendulum to continue swinging without slowing down.
False
TRUE or FALSE: Potential energy and kinetic energy undergo constant conversion as a pendulum swings.
True
TRUE or FALSE: The weight at the end of a pendulum reaches maximum kinetic energy at the highest point in the pendulum's swing.
False
TRUE or FALSE: A pendulum consists of a weight suspended from a string that swings back and forth.
True
TRUE or FALSE: For a mechanical change in an isolated system, the mechanical energy at the beginning equals the mechanical energy at the end of the process, as long as friction is negligible.
True
At what point during a pole-vaulter's jump is his gravitational potential energy the greatest?
At the highest point of the jump.
As an object falls, the gravitational energy of the objects is converted into ____.
kinetic energy
A moving object slows down because friction causes a continual conversion of kinetic energy into ____ energy.
thermal
What does the Law of Conservation of Energy state?
Energy cannot be created or destroyed
TRUE or FALSE: When an object slows down because of frictional forces acting on it, an amount of energy is destroyed that is equivalent to the decrease in KE of the object.
False
When a wind-up toy is set into motion, elastic potential energy that was stored in a compressed spring is converted into the ____ energy of the toy's moving parts.
kinetic
TRUE or FALSE: Energy can be converted from one form to another
True
What form of energy: Increases as atoms within an object move faster.
thermal energy
What form of energy: Produces lightning bolts.
electrical energy
What form of energy: Travels through space in the form of waves.
electromagnetic energy
What form of energy: Produces the sun's heat and light.
Nuclear energy
What form of energy: The sum of an object's potential and kinetic energy.
mechanical energy
What form of energy: Energy stored in gasoline, coal and wood.
chemical energy
A guitar string stretched to one side is an example of _____ potential energy.
elastic
A diver on a platform high above the water is an example of ______ potential energy.
gravitational
The potential energy of an object that is stretched of compresses is _______.
elastic potential energy
TRUE or FALSE: Gravitational potential energy of an object increases as its height increases.
True
An objects gravitational potential energy depends on its _____, its _____, and the acceleration due to gravity.
mass, height
TRUE or FALSE: The work done by a rock climber going UP a cliff decreases her potential energy.
False
Potential energy is the energy that is stored as a result of an objects ____ or ____.
position or shape
Calculate the kinetic energy of a 0.25kg toy car traveling at a constant velocity of 2 m/s.
0.5 Joules
What is the formula to solve for Kinetic Energy?
KE = ½mv²
TRUE or FALSE: You can determine the kinetic energy of an object if you know its mass and its volume.
False
Energy of motion is called ______.
Kinetic Energy
TRUE or FALSE: One joule equals one meter per Newton.
False
TRUE or FALSE: Both work and energy are usually measured in Joules.
True
TRUE or FALSE: Energy is transferred when work is done.
True
TRUE or FALSE: Energy in food is converted into muscle movement.
True
When work is done on an object, _______ is transferred to that object.
energy
Energy is the ability to do _______.
work
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