Speed 
the distance traveled in a certain amount of time
velocity 
a vector quantity related to speed.
Acceleration
change in speed or velocity with time 
Friction
the force that resists relative motion between two bodies in contact 
Acceleration due to gravity (on Earth) 
9.8 m/sec2
Mass 
is the property of matter that manifests itself as inertia and may be thought of as the quantity of matter in the body.
Weight 
the force of gravity upon the mass
Centripetal force
the inward pull exerted on an object that is moving in a circular path


According to Newton's third law of motion, 
A)  there is no such thing as a single force acting on an object.
B)  for every force there is an equal and opposite reaction force, but each acts on a different object 
C)  action and reaction forces need not be equal, but must act in opposite directions 
D)  action and reaction forces must be equal, but need not act in opposite directions 


What is the difference between velocity and speed?
A)  Both are exactly the same.
B)  Velocity has a direction associated with it, speed does not.
C)  Speed has a direction associated with it, velocity does not. 
D)  Speed is the same thing as acceleration. 

A man throws a baseball straight up in the air at 19.6 m/s. How long does it take to reach the top? 
A stone is dropped from the top of a building and strikes the ground ___ seconds later.  How high is the building in meters?
A car is traveling at ___ m/s.  How many seconds does it take for the car to travel 491 meters?  
Convert ____ meters to feet.



reach the ground at the same time  
have the same speed when they reach the ground  
have the same acceleration when they reach the ground  
none of the above