Ch. 2
Motion occurs when an object changes its _______.
Position
forces that cancel each other are called ______.
balanced forces
_________ is the ability to cause change.
Energy
An object at rest stays at rest and an object in motion stays in motion, unless an unbalanced force acts on it.
Newton's 1st Law
What does the law of conservation of energy state?
energy cannot be created or destroyed
______ is the distance an object travels per unit of time.
Speed
What type of friction?
a snow skier slowing to a stop after skiing down a mountain
sliding friction
what type of energy is a ball rolling across the floor?
kinetic energy
What causes a rocket to move
the rocket's engines push exhaust gas away from it, the rocket moves up. (Newton's 3rd law)
Where did Mrs. Pickett cheer in high school?
Brother Martin
Geaux Saders!
the direction and speed of an object
velocity
What causes acceleration to change in an object traveling in a circular path
direction changes
the transfer of energy that occurs when a force makes an object move
Work
Which Law is the Law of Inertia?
Newton's 1st Law
What are Mrs. Pickett's 2 daughters names?
Eleanor & Margot
What is measured on a speedometer?
instantaneous speed
what happens to the gravitational force as objects get farther apart?
it decreases
what two factors determine how much kinetic energy an object has?
mass & velocity
The reason a father can throw a ball faster than his son.
Newton's 2nd Law
How old is Mrs. Pickett?
26
any change over time
rate
what is it called when the force of gravity EQUALS the force of air resistance of a falling object
terminal velocity
what happens to PE and KE of an apple when it falls off a tree.
KE increase
PE decreases
What is Newton's 2nd Law formula?
f=m/a
What is Mrs. Pickett's husband's name?
Ryan