Bell Ringer

1
Bell Ringer

• Calculate my acceleration as I drove to school
  today using these measurements
• 0 km/s to 96 km/s in 10 s

2
Position and Velocity vs. Time Graphs
3
1. Your mother walks five meters to the kitchen
at a velocity of 2 m/s, pauses by the
refrigerator for three seconds, then walks back
with a plate full of potato salad at a velocity
of 1 m/s.
v p/t, so t p/v T 5 m/2 m/s 2.5 s T
5 m/1 m/s 5 s
Position vs. Time
5 m
2.5 s
5.5 s
10.5 s
Velocity vs. Time
2 m/s
5.5 s
10.5 s
2.5 s
-1 m/s
4
2. A car is driving down the road at 55 mph, and
after getting a flat tire moves at 35 mph.
Position vs. Time
flat
Velocity vs. Time
55 mph
35 mph
flat
5
3. A bullet is fired from a gun and travels 1000
meters in one second before hitting a solid
target.
Position vs. Time
1000 m
1 s
Velocity vs. Time
1000 m/s
1 s
6
4. A circus elephant picks up a clown (who is not
moving) and throws him across the ring at high
speed.
Position vs. Time
Clown up
Clown down
Velocity vs. Time
Clown up
Clown down
7
5. At track practice, the coach makes the team
members run back and forth between two lines
three times.
Position vs. Time
Velocity vs. Time
8
6. When you hit a golf ball, it travels through
the air at 25 m/s, then decelerates once it hits
the ground 100 meters away until it comes to a
stop 110 meters away.
v p/t, so t p/v T 100 m/25 m/s 4 s
Position vs. Time
110 m
100 m
4 s
Velocity vs. Time
25 m/s
4 s