ground.
What is the acceleration of the sled?
What is the force of the surface acting up on the sled?
1.79m/s
2
, 124.5N
18)
A car is traveling at 25m/s when it slams on the brakes and skids to stop.
If the coefficient of
kinetic friction is 0.6, how far does the car travel before coming to a stop?
Do you need to know the
mass of the car?
53.1 m,
NO
19)
A truck is traveling at 35m/s when the driver realizes the truck as no breaks.
He sees a ramp off the
road that in inclined at 20° and decides to go up it to help the truck come to a stop. How far does the
truck travel before coming to a stop (assume no friction).
182.84m
20)
Santa is parked on a snow covered roof that is inclined at an angle of 15°.
The coefficient of
kinetic friction between Santa’s sled and the snow covered roof is 0.15.
The sled’s parking brake fails to
work.
How long will it take Santa’s sled to slide off the 5m long roof?
2.99s
21)
A massless rope hangs over a frictionless pulley.
On one end of the rope is a
1.5kg mass.
On the other end of the rope is a 2kg mass.
If both masses are released
from rest, how long will it take for either mass to travel 5m?
2.67s
22)
Find the force exerted by each string
Find the force exerted by each string
588N, 831.56N
470.4N, 337.84N
CIRCULAR MOTION
:
23)
An insect on the edge of a 15cm radius record completes one rotation in 0.56s. (a) Determine the
speed of the insect? (b) Repeat only for an insect that is half way from the center of the record to its
edge. (c) Determine each insect’s acceleration. (d)
If the coefficient of static friction between the insect
and the record is 0.2, what is the maximum velocity for each insect before it slides of the record?
a)
1.68m/s
b)
0.84m/s
c)
18.8m/s
2
, 9.4m/s
2
d)
0.54m/s, 0.38m/s
24)
A car is traveling in a circle of radius 10m at a speed of 20m/s.
a)
What is the car’s acceleration?
40m/s
2
b)
If the car has a mass of 800 kg, what is the force of friction on the car?
32,000N
c)
What is the period for the car?
3.14s
25)
A 2 kg ball is swung in a vertical circle.
The length of the sting the ball is attached to is 0.7 m.
It
takes 0.4 s for the ball to travel one revolution (we will
assume
constant speed)
a)
What is the period of the ball?
0.4 s
b)
What is the speed of the ball?
11 m/s
c)
What is the force of the string on the ball at the top?
326.1 N
d)
What is the force of the string on the ball at the bottom?
365.3 N
60kg
135°
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26)
#25 is just one type of vertical.
Remember that there are other scenarios that result in other FBS’s
that might alter the math a little.
Overall though, the concepts and set up are the same.
Going through
old notes/HW’s might help you study.
27)
A person of mass 60 kg is 3 m from another person whose mass is 80 kg.
What is the gravitational
force between them?
3.56x10
8
N
28)
A communications satellite orbits the Earth at an altitude of 35,000km above the Earth’s surface.
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 Fall '12
 Lahm
 pH, Force, Friction, Mass, Light, AP Physics, Velocity, Santa

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