Vocabulary
How do we describe starting position?
at zero, away from zero, near zero
The slope of the position vs time graph is defined as
Velocity
What is the average speed of a cheetah that sprints 600 m in 10.0 s?
60 m/s
Describe this graph (1).
Object starts at zero and is at a constant velocity of zero.
How do we describe Direction?
positive (away from zero) or negative (towards zero)
To measure velocity you must know
Displacement and Time
Draw the graph: Man speeding up, moving away from zero
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Describe this graph (3).
Object starts close to zero and moves with a positive constant velocity.
How do we describe Type of motion?
constant speed, at rest, speeding up, slowing down, or changing direction
Draw the graph: Man speeding up, moving toward zero
-)
Draw the graph: Man slowing down, moving toward zero
(_
Describe this graph \~
Object starts away from zero then moves with a negative constant speed then slows down and moves with a negative constant velocity.
What is the displacement for someone who ran a mile at the track? (1 mile = 4 laps)
0 miles
How do you describe Relative Speed?
slow, medium, or fast
Draw the graph: Man slowing down, moving away from zero
(-
Draw the velocity- time graph: Man speeding up, moving toward zero (Use the description of motion to help)
- \
Describe this graph (6).
A car moving at 30.0 m/s slows uniformly to a speed of 10.0 m/s in a time of 5.00 s. Determine the acceleration of the car.
-4 m/s^2
Draw the graph that best represents the relationship between velocity and time for a ball rolling from rest down a constantly sloped incline.
_/
Draw the velocity-time graph: Man slowing down, moving away from zero
A car initially traveling at 55 m/s slows to 25 m/s under a uniform acceleration of -3.0 m/s2 to avoid rear-ending another car. How long does it take the car to slow down? Show your equation, work, and answer with units. (4 pts)
10 seconds