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Physics - Unit 7
Speed, Velocity, Acceleration and Momentum
18
Science
11th Grade
11/25/2011

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Term
Motion
Definition
A change in position in a certain amount of time
Term
Displacement
Definition
The shortest distance between the initial and final positions of something in motion
Term
Distance
Definition
The length of the path traveled between the initial and final positions of something in motion
Term
Speed
Definition
The rate at which an object moves
Term
Speed calculation formula
Definition
S = d/t
Term
Constant speed
Definition
Speed stays the same as an object moves
Term
Average speed
Definition
The speed of an object over time, even with speed changes
Term
Instantaneous speed
Definition
The speed of an object at a given moment
Term
Velocity
Definition
Speed in a given direction
Term
Acceleration
Definition
The rate of change of velocity
Term
Velocity calculation formula
Definition
V = d/t
Term
Acceleration calculation formula
Definition
A = (Vf-Vi)/t
Term
Momentum
Definition
Determines how hard it is to stop an object in motion
Term
Momentum calculation formula
Definition
p = m x v
Term
Units for speed or velocity
Definition
m/s or km/hr
Term
Units for acceleration
Definition
m/s2 (meters per second squared)
Term
Units for momentum
Definition
kg m/s
Term
Law of Conservation of Momentum
Definition
The total momentum of a group of objects stays the same unless outside forces act on the objects
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