Distance & Displacement
Speed & Velocity
Acceleration
Position vs Time Graphs
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100
The total length of the path an object travels.
Distance
100
A unit for speed
m/s, mi/hr, etc. anything with a distance unit per a time unit
100
The definition for acceleration
The rate at which velocity changes or the change in velocity over time
100
In which part of this graph is the object stopped?
B & E
100
Quantities that are fully described by a magnitude (or numerical value) alone.
What is a Scalar?
200
How to calculate displacement
What is final position minus initial position?
Δx = xf - xi
200
A unit for velocity
Many correct options, for example meters per second right or miles per hour North; must have a distance unit per a time unit AND a direction
200
Acceleration can be [positive only, negative only, positive or negative]
What is acceleration can be positive or negative?
200
In which part of this graph is the object moving the fastest?
Part C/D has the steepest slope, therefore it is the fastest movement
200
Quantities that are fully described by both a magnitude and a direction.
What is a vector?
300
Benji runs 10 feet to get a toy, runs back 10 feet to his backpack, realizes he forgot his sippy cup, runs 15 feet to his sippy cup, gets distracted, and stops. What is his distance?
What is 35 feet?
300
Speed can be [positive only/negative only/positive or negative], and velocity can be [positive only/negative only/positive or negative]
What is speed can be positive only and velocity can be positive or negative?
300
A car traveling north accelerates from 10 m/s to 26 m/s in 2 seconds. Determine the acceleration of the car.
Acceleration = 8 m/s2, north
300
In which part of this graph does the object return to where it started?
None! The object does not return to where it started.
300
Benji rides in the car at a velocity of 75 miles per hour West for 1.15 hours. What is his displacement?
What is 86 miles West?
400
Benji walks 5 blocks East to the park, gets tired, walks 3 block back toward his house, and stops. What is his displacement?
What is two blocks East?
400
The equation for average velocity
What is displacement divided by time?
vave = d/t vave = Δx/t
400
A car moving east at 40 m/s slows down to 15 m/s in 5 s. Determine the acceleration of the car.
Acceleration = - 5m/s2 or 5m/s2, west
400
A straight positive line on a distance/time graph is indicating this.
An object is traveling away at a constant velocity.
400
The total distance covered divided by the time.
What is average speed?
500
Coach Ulcer paces the sidelines. Starting at the 10 yd line (A), he moves east to the 40 yd line (B), back to the 0 yd line (C) and finally to the 30 yd line (D)
Determine his distance and displacement
Distance = 100 yds
Displacement (Δx)= 20 yds, east
500
Benji runs east to the other side of his backyard, which is 10 meters, in 4 seconds. What is his velocity?
What is 2.5 m/s, east?
500
A car that is traveling east at 10 m/s accelerates for 3 seconds at 5m/s/s. What is the final velocity of the car?
vf = 25 m/s
Rearrange the equation for acceleration
vf = at + vi
a= (vf-vi)/t
500
Draw a position vs time graph that shows an object moving away from the origin at a constant speed in a negative direction. Then the object stops for a period of time. Finally the object moves at a faster constant speed past the origin in a positive direction
The graph should show a straight line going down from the x axis to the right. Then the line should be a straight horizontal line. Finaly, a steep line going up past the x axis.
500
The speed at any instant.
What is instantaneous speed?
600
Coach Ulcer paces the sidelines. Starting at the 30 yd line (A), he moves west to the 10 yd line (B), back to the 50 yd line (C) and finally to the 20 yd line (D) in 200 seconds. Determine his distance and displacement
Distance = 90 yds
Displacement (Δx)= 10 yds, west
600
A wind up toy car is released. It travels 6m in a straight line for 1.2 s. What is the final velocity & acceleration of the car?
vf= 10 m/s. a= 8.3 m/s/s (vave = 5 m/s)
Use the three equations we used in the ping pong lab.
vavg = Δx / Δt vf = 2 (vavg) - vi a = (vf - vi) / Δt
600
Motion is described within ___________, a system of coordinates with a fixed origin.
a frame of reference