Describing Motion
A Little Math
Motion in Motion
100
The distance between an object and a reference point is the object’s_____________
position
100
What is the equation for momentum?
p = mv
100
If an object has a constant velocity, then it has an acceleration of______
zero
200
A change in velocity means a change in
speed, direction, or both
200
Average speed is found by
S=
dividing total distance traveled by the total time
200
____________ __________ is the speed of an object at any instant of time
Instantaneous speed
300
What causes Earth’s projectiles to follow a curved path
gravity
300
The direction and speed of an object is described by its __________
velocity
300
At 8:00 AM you leave home and walk 0.5 km to a friend’s house. At 11:30 AM you return home, then travel by car to the mall, which is 10 km away, and arrive at 11:45 AM. What is the total distance traveled?
11 km
400
An object’s __________ is the distance and direction of an object’s change in position.
displacement
400
If a car travels at 60 km/h for 2 hours, how far does it go?
120 km
d = s × t
400
As you brake your bicycle, your velocity changes from 20 east m/s to 10 east m/s in 5 seconds. What is your acceleration?
2 m/s2 west
500
What is Bill's average running speed?
0.33 km/min
500
If you walk 10 meters in 2 seconds, what is your velocity?
5 m/s
Velocity (v) = Distance (d) / Time (t)
500
If a runner maintains a constant speed of 12 km/h, how long will it take to complete a marathon race of 26.2 miles?
3.52 h