A person pushes a 20 kg crate with a constant force of 600 N at an angle of 20°
below
the horizontal.
The crate starts from rest and after 5 s, is traveling at 4 m/s.
What is the coefficient of kinetic friction
between the crate and the surface?
1.37
9)
Below are three different masses each of which has a coefficient of kinetic friction of 0.15 between
the surface and the masses.
The masses are connected by ropes.
The mass on the right is being pulled
with a force of 300 N.
a)
What is the acceleration of the system?
9.64 m/s
2
b)
What is the net force acting on each mass?
48.2N, 115.68N, 96.4N
c)
What is the force of Rope 1 on mass 1?
55.55N
d)
What is the force of Rope 1 on mass 2?
55.55N
e)
What is the force of Rope 2 on mass 2?
188.87N
f)
What is the force of Rope 2 on mass 3?
188.87N
10)
A car traveling at 25m/s slams on the brakes and skids for 12m on a drive patch of concrete where
the coefficient of kinetic friction is 0.8.
The road ends and it skids on wet grass until it comes to a stop.
The coefficient of kinetic friction between the wet grass and the tires is 0.3.
What is the total distance
the car skids?
86.29m
11)
A 5 kg mass is supported by two cables, as seen below.
What is the
tension in each of the ropes?
23N, 42.98N
300 N
Mass 1
Mass 2
Mass 3
5 kg
12 kg
10 kg
Rope 1
Rope 2
Rope 1
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '11
 Hill
 Acceleration, Force, Friction, Mass

Click to edit the document details