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What is the ability to do work?
Energy
True or false: The more kinetic energy an object has, the more it can cause change.
True. The harder you throw a ball, the farther it will go.
Kinetic means _________________
Movement
True or false: When one object runs into another object, energy is transferred.
True. Example: knocking over dominoes
True or false: Only some objects have kinetic energy.
False - all objects have kinetic energy.
In a frictionless world, what would happen to a child swinging on a swing?
He would never stop swinging.
Give an example of a pulley simple machine.
A pulley.
Who developed the Theory of General Relativity?
Albert Einstein
Give an example of a lever (1st, 2nd, or 3rd class).
1st see-saw
2nd wheelbarrow
3rd broom
What is the SI unit for energy?
joule
The gravitational potential energy of an objects is its mass x acceleration due to gravity x its _________.
Height
What type of potential energy does a pogo stick have?
When you set a book on a table, you have given the book what kind of energy?
Potential energy
Give an example of electromagnetic energy (that wasn't given before).
Radio waves, microwaves, infrared light, visible light, ultraviolet light, x-rays, or gamma rays
Give an example of electrical energy.
Hairdryer, toaster, lamp, lightning, etc...
Give an example of electromagnetic energy (that wasn't given before).
Radio waves, microwaves, infrared light, visible light, ultraviolet light, x-rays, or gamma rays
What are the two types of energy?
Potential and kinetic.
What type of energy is a diver exerting as she climbs the ladder of the diving board?
Kinetic.
What type of energy is lightning?
Electrical energy
What type of potential energy does a rubber band have?
Elastic
True or false: Ice cubes have thermal energy
True. ALL objects have thermal energy because at the atomic level everything has kinetic energy.
True or false: Energy disappears when it is used.
False. It is merely transferred or converted to another form of energy
After the seagull has dropped the oyster and it is halfway to the ground, what are the percentages of potential energy and kinetic energy?
50% and 50%
You are using a screwdriver to put a screw into a piece of wood. What is the input force?
Your hand turning the screwdriver.
What is the definition of potential energy?
Energy that is stored (as a result of position or shape).
What needs to be added in order for objects to have more thermal energy?
Heat
Mechanical energy is ________ + ________.
Potential energy + kinetic energy
Electromagnetic energy is also known as _______ energy.
Light or radiant
What is the source of most of Earth's energy?
The sun
What is nuclear fusion?
True or false: According to the definition of work, it doesn't matter what direction the object is moving.
False. The object MUST be moving in the SAME direction as the force that is moving it.
True or false: Sound waves can travel through solids.
True. Example: put your ear on a table and tap the table with your finger.
What causes objects to have thermal energy?
The energy in the atoms.
What type of energy acts on a ripe apple, if no one picks it?
Gravitational energy.
Give an example of potential chemical energy.
Wood
Gasoline
Coal
What does sound energy have to have to be heard?
What is nuclear fission?
Splitting atomic nuclei.
When the seagull has the oyster in its mouth, what is the percentage of potential energy?
100%
What is Einstein's equation for the Theory of General Relativity?
E = mc2
True or false: machines do not change the amount of work done, they just make it easier.
True
Name ONE of the things the kinetic energy of any moving object depends on.
The object's mass
The object's speed
What type of energy is acting on a diver once she has jumped off the diving board?
Gravitational energy
When an object becomes so hot, thermal energy converts to ___________ energy.
Light
What is a closed system?
Nothing (energy) can enter or leave. Example on top of page 279 in textbook
What is the acceleration due to gravity in English units?
32 ft./s2
What is the speed of light in seconds?
186,000 miles per second
What is the acceleration due to gravity in metric units?
9.8 m/s2
Work is only done when a _________ causes an object to move.
force
Describe the data from our rubber band experiment.
The more potential energy the rubber band had, the more kinetic energy was transferred, and the farther it flew.
Give an example of mechanical energy.
A shot rubber band could knock over a cup.
A racket could make a ball change direction.
A running child could knock over another child.
This type of energy is the only energy we can see.
Electromagnetic
The heat and light of the sun are produced by the fusion of __________ nuclei into __________ nuclei.
Hydrogen, helium
What is the only energy that can be transferred without touching other matter?
Electromagnetic energy
What is the Law of the conservation of energy?
Energy cannot be created or destroyed; it can only be converted from one form to another or transferred from one object to another.
What does the "c" stand for in E = mc2?
c = the speed of light
To do work at a faster rate requires more _________.
Power