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# Hi anyone able to help me with these Mechanical Eng question.i dont quite understand

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Mechanical Engineering Fundamentals
38MER
Mechanical Engineering Fundamentals
38MEF
NGEE ANN POLYTECHNIC
5. Blocks A and B are connected by a taut cable guided over a smooth pulley. Block A is
SCHOOL OF ENGINEERING
resting on a smooth surface and block B is resting on a rough surface with a certain
MECHANICAL ENGINEERING FUNDAMENTALS
coefficient of static friction, us. Assuming that both blocks are in impending motion to the
left, draw two separate free-body diagrams of block A and block B.
Tutorial 5.3: Friction
1. If a horizontal force of 50 N is required to start a 15 kg block moving on a horizontal
surface, what is the value of the coefficient of static friction?
21 kg
-J. 36.87
rough surface
2. Determine the mass of a block if a horizontal force of 20 N is required to start it moving
on a horizontal surface where the coefficient of static friction is 0.34.
6. Blocks A and B are staked together as shown. Block A is connected to a wall by a taut
string, while block B is subjected to a force, P, acting along the slope. The coefficient of
static friction at both rough surfaces is us. Assuming that block B is in impending motion
3. A block of mass 40 kg rests on a rough surface with a coefficient of static friction, He =
down the slope, draw two separate free-body diagrams of block A and block B..
0.21, if the block has an impending motion to the left, draw its free body diagram and
calculate the friction force present.
rough surface
40 kg
rough surface
30
4. A block of mass 20 kg rests on a horizontal surface and the coefficient of static and kinetic
friction between the two surfaces are 0.33 and 0.25, respectively. Calculate the following:
a. The horizontal force required to start moving the block.
b. The kinetic friction force.
End
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