Speed
What is the formula for speed?
s=d/t
speed = distance/time
What is the meaning of velocity?
the speed and direction of a moving object over time.
How is acceleration different from velocity?
Acceleration is the rate at which velocity changes. Velocity is speed with direction.
Image 1
Rest
An object's change in position relative to a reference point.
Motion
Does speed have a direction?
No, speed does not have a direction.
What is the typical unit used for velocity?
meters/second
m/s
What is the usual unit for acceleration
meters/second2 (m/s2)
Image 2
Constant velocity
The distance traveled per unit of time is called--
speed
A car travelled 125 meters in 10 seconds. How fast was the car moving? (BONUS: is this a speed, velocity, or acceleration problem?)
12.5 m/s (BONUS: it's a speed problem; no direction and no final/initial velocity)
You paddle south on San Marcos River for 8 miles in 3 hours. What is your velocity?
2.25 mph (miles/hour)
What is the formula for acceleration?
(Final velocity - initial velocity)/Time
(vf - vi)/t
Constant acceleration (negative)
The speed and direction of a moving object.
Velocity
What is the speed of a rocket that travels 9000 meters in 12.12 seconds?
742.6 m/s
If a cyclist in the Tour de France traveled southwest a distance of 24,250 meters in 2.5 hours, what would the velocity (in meters per second) of the cyclist be?
9700 m/s
A car starts from a stoplight and is traveling with a velocity of 10 m/sec east in 20 seconds. What is the acceleration of the car?
0.5 m/s2
Image 4
Increase in acceleration
The rate at which velocity changes
Acceleration
A trip to Cape Canaveral, Florida takes 10 hours. The distance is 816 km. Calculate the average speed.
81.6 km/h
You are traveling 40 mph west on Rattler Road. Is this an example of speed or velocity?
Velocity (speed with direction)
A ball rolls down a ramp for 15 seconds. If the initial velocity of the ball was 0.8 m/sec and the final velocity was 7 m/sec, what was the acceleration of the ball ?
.41 m/s
(or .4 m/s)
Image 5
Object is getting closer to starting point
Greatness of size, strength, or importance
Magnitude