What is Energy?
Forms of Energy
Energy Transformations and Conservation
Random #1
Random #2
100
This is the ability to do work or cause change.
What is energy?
100
The form of energy associated with the position and motion of an object is called . . .
What is mechanical energy?
100
How most forms of energy relate to each other?
Most forms of energy can be transformed into other forms.
100
Work equals change in kinetic energy. This is the . . .
W = DeltaKE
What is the work-energy theorem?
100
Find the power of a machine that transfers 450 J of energy in 9 s
P = 50 Joules/second
200
This is a measure of work done (or energy transferred) and the time it takes to do it.
What is power?
200
You can find an object's mechanical energy by . . .
You can find an object's mechanical energy by adding the object's kinetic energy and potential energy.
200
The transformation between potential energy and kinetic energy is a common example of . . .
What is energy transformation?
200
This is a simple machine consisting of a rigid rod pivoted at a fixed point called the fulcrum.
What is a lever?
200
The formula,
1/2 times Mass times Velocity^2
, is used to solved for
What is kinetic energy?
300
A rubber bouncy ball has this sort of energy when it hits the ground. Be specific!
What is elastic potential energy?
300
Thermal energy, electrical energy, chemical energy, nuclear energy, and electromagnetic energy are all forms of energy associated with . . .
Thermal energy, electrical energy, chemical energy, nuclear energy, and electromagnetic energy are all forms of energy associated with the particles of objects (atoms).
300
A toaster transforms electrical energy to thermal energy to toast your bread. This is an example of a . . .
(Be specific!)
What is a single energy transformation?
300
This is a device that multiplies force or simply changes the direction of force.
What is a machine?
300
Coal is burned to make steam, transforming stored ____ energy to _____ energy.
Coal is burned to make steam, transforming stored chemical energy to thermal energy.
400
Which has a greater effect on an object's gravitational potential energy, the object's weight or height?
Neither. Their influence is equal!
Gravitational Potential Engy = Weight times Height
400
The particles in a bunch of grapes contain this sort of energy.
What is chemical energy?
400
When one form of energy is transformed to another, no energy is destroyed in the process. This demonstrates which scientific law?
What is the law of conservation of energy?
400
Batteries have _____ ______ energy.
Batteries have potential electrical energy.
400
At the highest point its swing, the pendulum has this kind of energy. Be specific!
What is gravitational potential energy?
500
Gravitational potential energy = weight X height
PE = mgh
What does g represent? What does it equal? (I'm looking for a number)
g is the average acceleration due to gravity on Earth. It equals 10 m/s2 (9.8 m/s2).
500
These are the four things we need to know about a skydiver to determine his potential and kinetic energy.
What are his weight, height (GPE), mass, and velocity (KE)?
500
Friction transforms _____ energy to ______ energy, which explains why no machine is 100 percent efficient.
Friction transforms mechanical energy to thermal energy, which explains why no machine is 100 percent efficient.
500
This is the fuel most widely used to produce nuclear energy.
What is uranium?
500
1 joule per second is also known as a . . .
What is a watt?
600
Changing the _____ of an object will have a greater effect on its kinetic energy than changing its _____ by the same factor.
Changing the velocity of an object will have a greater effect on its kinetic energy than changing its mass by the same factor.
Kntic Engy = 1/2 times Mass times Velocity^2
600
What kind of atomic reaction occurs on the Sun? As a result of this reaction, what kind of energy does the Sun have?
Nuclear fusion (the fusing together of atoms' nuclei) gives the Sun nuclear energy.
600
List the energy transformations that occur at a coal power plant. There are 3.
1. Chemical (potential) - Thermal
2. Thermal - Mechanical
3. Mechanical - Electrical
600
This is the byproduct of nuclear energy.
What is radioactive material/waste?
600
Nuclear reactors use _______, or the splitting of atoms, to produce energy.
Nuclear reactors use fission, or the splitting of atoms, to produce energy.