Speed/Velocity
What is speed?
The rate of distance over time.
The velocity of a jogger that ran 321 meters in 70 seconds.
S= 4.58 m/s OR 4.6 m/s
What is acceleration?
A change in velocity or direction
The acceleration of an object that has a final velocity of 53 m/s, an initial velocity of 5m/s, and a time of 25 seconds.
A = 1.92 m/s2
Meters is used to measure _______
Distance
Distance or Displacement?
10 meter North
What is displacement?
What is velocity?
Speed + DIRECTION
The distance an object travels if the velocity is 26 m/s and the time is 23 seconds.
D = 598 meters
Choose the statement where the car has no acceleration.
A. A car shortly after a stop light turns green
B. A car approaching a red light
C. A car with the cruise control set at 80 km/h
D. A car turning a curve at a constant speed
C
The acceleration of an object starting from rest with a velocity of 98 m/s in 5 seconds.
A= 19.6 m/s2
The equation used to solve for distance in the speed equation.
What is distance = speed x time?
Sally runs exactly 2 laps around a 400-meter track. Her total distance is _______.
What is 800 meters?
How to calculate speed
Speed = distance divided by time
The time it takes an object to travel 198 meters at a velocity of 34 m/s.
T = 5.8 seconds
An object that is not accelerating is moving at a ____________.
constant speed and/or direction
The acceleration of an object with an initial velocity of 100 m/s and a final velocity of 20 m/s in 60 seconds.
A= -1.3 m/s2
Solving for time in the speed Equation.
What is time = distance/speed
Displacement is always (greater than/equal to/less than) distance.
equal to or less than
An object that is motionless on a distance-time graph is represented by a ____________.
Flat horizontal line
The velocity of an object that travels 23 meters in 18 seconds.
V = 1.27 m/s OR 1.28 m/s
Speeding up, slowing down, or changing directions.
What are examples of acceleration?
The acceleration of an object with a time of 0.25 seconds and a change in velocity of 32 m/s.
A= 128 m/s2
m/s/s or m/s2
The units for acceleration
Amy runs 2 miles south, then turns around and runs 3 miles north. What is her total distance and displacement?
Distance is 5 miles and displacement is 1 mile North
The steeper the line on a distance-time graph, the _________ the speed.
faster or higher
What is the distance an object travels if going at a velocity of 8 m/s in 28 seconds.
D = 224 meters
Describe negative acceleration
What is when an object slows down or when speed/velocity is decreasing?
The acceleration of an object with an initial velocity of 15 mph and a final velocity of 45 mph in 30 minutes. (HINT: convert time into hours)
A= 60 mi/h2
The equation used to solve for acceleration.
What is acceleration = velocity final - velocity initial / time
Ted ran 8 blocks north and then two blocks south, toward his starting point. State his distance and displacement.
Distance is 10 blocks and Displacement is 6 blocks South