Additional Newton’s Second Law of Motion Problems and Friction Problems
1.
A 1250kg car accelerates from 10 m/s to 30 m/s in 5 seconds. What is the net force on
the car?
=
aav
∆v∆t
=
F ma
=

30 ms 10 ms5 s
=
1250 kg4 ms2
=
4 ms2
=
5000 nt
2.
A 12,000kg airplane launched by a catapult from an aircraft carrier is accelerated from 0
to 200 km/hr in 3.0 seconds.
a.
What is the acceleration of the airplane?
×
×
=
.
200 km1 hr
1000 m1 km
1 hr3600 s 55 6ms
=
aav
∆v∆t
=
.

.
55 6 ms 0 ms3 0 s
=
.
18 5 ms2
b.
What is the average force in newtons that the catapult exerts on the airplane? Covert
this force to pounds.
=
F ma
,
×
.
=
,
222 000 nt
1 lb4 4 N 50 500 lb
=
,
.
12 000 kg18 5 ms2
=
,
222 000 nt
3.
A 600gram ball lying on the ground is kicked with a force of 250 newtons. If the kick
lasts 0.02 seconds, what is the speed that the ball flies off with?
×
= .
600 g
1 kg1000 g 0 600 kg
=
F ma
=
aav
∆v∆t
= .
250 nt 0 600 kga
=
.
417 ms2
∆v0 02 s
=
a 417ms2
= .
∆v 8 33 ms
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 Spring '11
 McDemus
 Physics, Force, Friction, Second Law Of Motion, 8 meters, 40 m/s, 600 g, aav= ∆v∆t

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