Kinetic Energy
the energy of motion
What is Kinetic Energy?
Define gravitational potential energy.
KE + PE = _______________
mechanical energy
A guy is walking his dog. He stops at a stop sign. What type of energy does he had during his entire trip?
mechanical energy (both kinetic and potential)
Which energy transformation takes place when you turn on a flash light?
Chemical/Potential --> Electrical --> Light & Heat
KE depends on 2 factors ...
mass & speed
Elastic potential energy
If kinetic energy decreases, potential energy increases, but the mechanical energy ...
stays the same.
A runner is stretching and getting ready for a race. What type of energy does he contain?
mechanical (both kinetic & Potential)
Which would have the greatest gravitational potential energy?
A. A 4lb rat on a school desk
B. A 45lb dog in an oak tree
C. A 14 pound platypus on a swing
D. A 45lb child on a bike
A 45lb dog in an oak tree
Ability to do work / Ability to cause a change.
energy
mass & height
Energy stored in a fuel (gasoline) ...
chemical/potential
What type of energy does a trampoline have?
What is elastic potential energy?
Which energy transformation takes place when you turn in a windmill?
Kinetic --> Electrical
Position of a pendulum with the lowest kinetic energy ...
When the pendulum is at the top (highest position).
What is the best subject?
Science!!!
As a pendulum swings from the bottom up, what happens to its kinetic and potential energy?
Potential energy increases & the kinetic energy decreases.
On top of a roller coaster, which energy do you have?
potential energy
Which energy transformation takes place when you turn on a TV?
Electrical --> Sound + Light + Heat
If a bowling ball is rolling down a hill at the same speed as a ping pong ball, which one has the greatest kinetic energy?
a. bowling ball
b. ping pong ball
c. both will have the same kinetic energy
bowling ball
(KE depends on speed, which is the same for both, and MASS).
When the kinetic energy decreases the potential energy ______
increases
Unit for energy ...
Joules
A biker at a peak of hill goes down the hill. Where does the kinetic energy is at the highest:
a) at the top
b) as he is going down the steep hill
c) at the bottom
Where the potential is at its lowest (the bottom).
What best describes the energy conversion that occurs when you turn on a hair dryer?
A. chemical to thermal to light and sound
B. electrical to kinetic to thermal and sound
C. nuclear to electrical to thermal and sound
D. kinetic to light to thermal and sound
electrical --> kinetic --> thermal & sound