Transcript Speed, Acceleration, and Newton*s Second Law

Speed, Acceleration, and
Newton’s Second Law
You may use the calculator on the
computer if you wish.
1) If Elijah runs 200 meters in
100 seconds, at what speed was
he traveling?
1) If Elijah runs 200 meters in 100
seconds, at what speed was he
traveling?
d=200 meters and t = 100 seconds
s = d÷t
200m ÷ 100 s = 2m/s
2) It takes Ben 30 seconds
to run 50 meters, at what
speed was he traveling?
IF YOU GET ONE AND TWO CORRECT,
SKIP TO FIVE. If you got one or two
wrong get more practice by doing three
and four.
2) It takes Ben 30 seconds to run
50 meters, at what speed was he
traveling?
d = 50 meters and t = 30 seconds
s = d÷t
50m ÷ 30 s = 1.67m/s
3) If Ryann swims 500 meters in
250 seconds, at what speed was
she traveling?
3) If Ryann swims 500 meters in
250 seconds, at what speed was
she traveling?
d=500 meters and t = 250 seconds
s = d÷t
500m ÷ 250 s = 2m/s
4) It takes Eleni .5 hours to bike
10 miles, at what speed was he
traveling?
4) It takes Eleni .5 hours to bike
10 miles, at what speed was he
traveling?
d=10 miles and t = .5 hours
s = d÷t
10mi ÷ .5h = 20mph
5) If Alexandra drives 600 miles to
Ohio at 60 miles per hour, how long
will it take her to get there?
5) If Alexandra drives 600 miles to
Ohio at 60 miles per hour, how long
will it take her to get there?
t=d÷s
d=600 miles and s=60mph
600mi ÷ 60mph = 10 miles
6) It takes Morgan walks a 9km
per hour, how long will it take
her to walk 90km?
If you got 5 and 6 correct, you may
skip to 9. If you got 5 or 6 wrong,
complete 7 and 8 for more practice.
6) It takes Morgan walks a 9km
per hour, how long will it take
her to walk 90km?
t=d÷s
d=90km and s=9km/h
90km ÷ 9km/h = 10 km
7) Juan bikes 33 miles at 11
miles per hour, how long will it
take him to get there?
7) Juan bikes 33 miles at 11
miles per hour, how long will it
take him to get there?
t=d÷s
d=33 miles and s=11mph
33mi ÷ 11mph = 3 miles
8) Joy runs 5 km per hour, how
long will it take him to walk
75km?
8) Joy runs 5 km per hour, how
long will it take him to walk
75km?
t=d÷s
d=75km and s=5km/h
75km ÷ 5km/h = 15 km
9) In 11 seconds, Olivia goes
from 0 km/h to 44 km/h. What is
her rate of acceleration?
9) In 11 seconds(time), Olivia goes
from 0 km/h (𝑠1 ) to 44 km/h (𝑠2 ).
What is her rate of acceleration?
change in speed divided by time
𝑠2 −𝑠1
𝑡
44−0
44
=
= 4 𝑘𝑚/h/s
11
11
10) Rei goes from 50 km/h to a
full stop in 20 seconds. What is
her rate of acceleration?
If you got 9 and 10 correct, skip to
13. If you got 9 or 10 wrong,
complete 11 and 12.
10) Rei goes from 50 km/h (𝑠1 ) to a
full stop (𝑠2 ) in 20 seconds(time).
What is her rate of acceleration?
change in speed divided by time
𝑠2 −𝑠1
𝑡
0−50
−50
=
= −2.5 𝑘𝑚/h/s
20
20
11) Dante skates at his highest
speed of 5 m/s to 20 m/s in
3seconds. What is his rate of
acceleration?
11) Dante skates at his highest
speed of 5 m/s (𝑠1 ) to 20 m/s (𝑠2 ) in
3seconds(time). What is his rate of
acceleration?
change in speed divided by time
𝑠2 −𝑠1
𝑡
20−5
15
=
= 5𝑚/s/s
3
3
12) In 30 seconds, Jonah goes
from 0 km/h to 90 km/h. What is
his rate of acceleration?
12) In 30 seconds(time), Jonah
goes from 0 km/h (𝑠1 ) to 90
km/h (𝑠2 ). What is his rate of
acceleration?
change in speed divided by time
𝑠2 −𝑠1
𝑡
90−0
30
=
90
30
= 3 𝑘𝑚/h/s
13) If Ethan wants to push a 20
kg box, 10m/s/s, how much force
does he need to apply?
13) If Ethan wants to push a 20
kg(mass) box, 10m/s/s(acceleration),
how much force does he need to
apply?
F=ma
F=20 x 10 = 200 Newtons
14) If Melanie pushes a 25g box
with 500N of force, how fast will
the box go?
14) If Melanie pushes a
25g(mass) box with 500N(force)
of force, how fast will the box
go?
F=ma
500 = 25a
a= 20 m/s/s
15) If Fredy wants to push a 100
kg box, 13m/s/s, how much force
does he need to apply?
15) If Fredy wants to push a 100
kg box, 13m/s/s, how much force
does he need to apply?
F=ma
F=100 x 13 = 1300 Newtons
16) Lauren pushes the cart that is
8g with 40N of force, how fast
will the cart accelerate?
16) Lauren pushes the cart that is
8g with 40N of force, how fast
will the cart accelerate?
F=ma
40 = 8a
a= 5 m/s/s
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Weight
Mass
Gravity
Force
Motion
Speed
Acceleration
Velocity
Inertia
Newton’s Three Laws