Figure out which ones are accelerating and which ones aren’t and explain why ?
A race car rounding a corner at a constant speed of 200
miles per hour.
A thrown rock after it leaves the thrower’s hand and before it
hits the ground
A toy top that is spinning, but staying in one place on the
floor
A book sitting on a table
Figure out which ones are accelerating and which ones aren’t
A race car rounding a corner at a constant speed of 200
miles per hour.
Answer: This thing accelerates
a lot. Not only does a race car
change speed often, it
changes direction whenever it
negotiates a curve.
A thrown rock after it leaves the thrower’s hand and before it
hits the ground
Answer:. It continually
changes direction, and it
also changes speed. A
thrown rock definitely
accelerates.
A toy top that is spinning, but staying in one place on the
floor
each part of the top changes
its direction as the
top spins. Therefore, the top is
accelerating.
A book sitting on a table
The table
and the book are on the
surface of the Earth, and the
Earth is spinning (changing
direction), so the book really is
accelerating
- Calculate the acceleration at each point on the graph:
E 0 m/s2
F (10-4 )÷(10-4) = 1 m/s2
G (7 - 10) ÷( 16 -10 ) = -0.5 m/s2
H (21-7 )÷ (20 – 16 ) = 3.5 m/s2
GRADE
1 change in velocity = 14 m/s; time taken for the change = 2 seconds _____________________________________
2 change in velocity = 55 m/s; time taken = 11 seconds _________________________________________________
3 velocity changes from 2 m/s to 12 m/s; time taken is 5 seconds _________________________________________
4 velocity changes from rest to 24 m/s in 6 seconds ____________________________________________________
GRADE
5 final velocity is 18 m/s, start velocity is 8 m/s; time = 10 seconds ________________________________________
6 velocity increases from 2 m/s to 22 m/s in 5 seconds _________________________________________________
7 velocity starts at 0 m/s and reaches 39 m/s after 13 seconds ___________________________________________
8 A car accelerates from rest (zero velocity) up to a speed of 30 m/s in 12 seconds
________________________________________________________________________________________________
GRADE
1 change in velocity = 14 m/s; time taken for the change = 2 seconds _____________________________________
2 change in velocity = 55 m/s; time taken = 11 seconds _________________________________________________
3 velocity changes from 2 m/s to 12 m/s; time taken is 5 seconds _________________________________________
4 velocity changes from rest to 24 m/s in 6 seconds ____________________________________________________
GRADE
14 ÷ 2 = 7m/s2
5 final velocity is 18 m/s, start velocity is 8 m/s; time = 10 seconds ________________________________________
6 velocity increases from 2 m/s to 22 m/s in 5 seconds _________________________________________________
7 velocity starts
and reaches
39 m/s2after 13 seconds ___________________________________________
55at 0÷m/s11
= 5m/s
8 A car accelerates from rest (zero velocity) up to a speed of 30 m/s in 12 seconds
24 ÷ 6 = 4m/s2
10 ÷ 5 = 2 m/s2
________________________________________________________________________________________________
12 – 2 = 10
24 – 0 = 24
2 change in velocity = 55 m/s; time taken = 11 seconds __________________________
3 velocity changes from 2 m/s to 12 m/s; time taken is 5 seconds _________________
4 velocity changes from rest to 24 m/s in 6 seconds ____________________________
B GRADE
velocity increases from 2 m/s to 22 m/s in 5 seconds __________________________
5 final velocity is 18 m/s, start velocity is 8 m/s; time = 10 seconds ________________
6
7 velocity starts at 0 m/s and reaches 39 m/s after 13 seconds ____________________
8 A car accelerates from rest (zero velocity) up to a speed of 30 m/s in 12 seconds
________________________________________________________________________
2 change in velocity = 55 m/s; time taken = 11 seconds __________________________
3 velocity changes from 2 m/s to 12 m/s; time taken is 5 seconds _________________
4 velocity changes from rest to 24 m/s in 6 seconds ____________________________
B GRADE
velocity increases from 2 m/s to 22 m/s in 5 seconds __________________________
5 final velocity is 18 m/s, start velocity is 8 m/s; time = 10 seconds ________________
6
7 velocity starts at 0 m/s and reaches 39 m/s after 13 seconds ____________________
8 A car accelerates from rest (zero velocity) up to a speed of 30 m/s in 12 seconds
________________________________________________________________________
10 ÷ 10 = 1 m/s2
20 ÷ 5 = 4 m/s2
18 – 8 = 10,
22 – 2 = 20,
39 ÷ 13 = 3 m/s2
30 ÷ 12 = 2.5 m/s2
39 – 0 = 39
30 – 0 = 30