What is the definition of energy?
The ability to do work or cause change.
When you combine kinetic and potential energy, you get the total ________ energy.
Kinetic + Potential = __________
Mechanical
A black 20 kg dog runs at 4 m/s. A brown 10 kg dog runs at 6 m/s. Which dog has more kinetic energy? SHOW YOUR WORK.
Black dog = 160 J, Brown dog = 180 J--Brown dog has more kinetic energy
10N x 4m = 40J
What type of energy is stored when you stretch a rubber band?
elastic potential energy
Energy in the form of motion is known as ________ energy.
Kinetic
What is the Power Equation?
Power (W) = Work (J) ÷ Time (s)
Power (W) = Force (N) x Distance (m) ÷ Time (s)
If the bowling ball is lifted 1.5 meters, and its gravitational potential energy is 90 J. How much does the bowling ball weigh? SHOW YOUR WORK.
60 N
A lemur pushes a tv 2 meters with 4 Newtons of force. It takes him 4 meters. How much power does he have? SHOW YOUR WORK
2 Watts
Power = Work / Time
W = FxD
4 x 2 = 8 / 4 = 2W
Gravitational Potential Energy is based on an object's _______? Elastic Potential Energy is based on an object's __________?
GPE = height
EPE = shape
Energy that results from the position or shape of an object, or stored energy, is known as _________ energy.
Potential
What is the equation for Kinetic Energy? What is it measured in?
KE (J) = ½ x Mass (kg) x Speed2 (m/s)
At a certain point, the kinetic energy of a falling basketball is 30.8 J and its potential energy is 16.0 J. What is its mechanical energy? SHOW YOUR WORK.
30.8 J + 16 J = 46.8 J
How much work is done when a truck lifts a metal beam 102.8 m with a force of 2,000 N? SHOW YOUR WORK.
205, 600 J
What is a factor that affects kinetic energy? Explain how it can affect it.
Mass and/or speed affect kinetic energy. If mass and/or speed increase, kinetic energy increases.
What is the definition of fusion and fission?
Fission - A nucleus splits into smaller fragments to release energy.
Fusion - Smaller nuclei combine to form a larger nuclei.
What is the difference between transfer and transform?
transfer - When energy moves from one object to another (example: when you kick a soccer ball the energy is moved from your foot to the ball).
transformation - When one form of energy changes to another (example: nuclear energy being transferred to your house has electrical energy).
If the kinetic energy of a bowling ball is 60 J and its potential energy is 24 J. What is its mechanical energy? SHOW YOUR WORK.
60 J + 24 J = 84 J
How much power is used when a lineman has 12 J of work over a 5 second play. SHOW YOUR WORK.
2.4 Watts
The process of photosynthesis in plants is a type of _________ energy.
The definition of the Law of Conservation of Energy states what?
When one object loses energy, another object must gain it.
Radio waves, microwaves, and visible light are all examples of what?
Electromagnetic Radiation
A girl pushes a boulder with a force of 24 J and starting to sweat. The rock doesn't move. Is work being done? Why or why not?
No work is being done because the boulder doesn't move. No motion = no work.
A 30-kg otter swims at a speed of 3 m/s. How much kinetic energy does the otter have? SHOW YOUR WORK.
135 J
Label the pendulum at the HIGHEST KE (kinetic energy), LOWEST KE (kinetic energy).
A & D = highest potential energy, lowest kinetic
C = highest kinetic energy, lowest potential