Definitions
What is energy?
the ability to do work or cause change
Work =
force x distance
the maximum amount of work is done when both the movement and the force are in the same direction
true
Joules
Which of the following is not a form of energy?
A. light
B. Sound
C. Air
D. electricity
C. Air
What is motion?
When the position of an object changes relative to another object
Power =
work/time or force x distance / time
Energy can be transferred from one place to another
true
What is the unit for mass?
kg or g
A. Spend more time stacking them
B. Stack fewer boxes
C. Stack them more quickly
C. Stack them more quickly
What is elastic potential energy?
the energy associated with objects that can be compressed or stretched
Pressure=
force/area
Energy is something you can see directly
false
What is the units for weight?
Newtons
Kinetic energy is the energy of
A. Motion
B. Gravity
C. distance
A. motion
What is work?
anytime you exert a force on an object that causes the object to change its motion in the same direction
gravitational potential energy =
weight x height
true
Stretching a rubber band is an example of?
A. kinetic energy
B. potential energy
C. gravitational energy
B. potential energy
What is power?
the rate at which work is done
Kinetic energy=
0.5x Mass x (speed)2
Energy and motion are not related to each other
false
What is the unit for power?
Watt
What could you do to increase the gravitational potential energy of a ball thrown from the roof?
A. increase the weight of the ball
B. decrease the weight of the ball
C. decrease the distance from the roof to the ground
A. increase the weight of the ball