Question 1 a.) Why is it important that the friction force in the pulley and the
ID: 1656834 • Letter: Q
Question
Question 1
a.)
Why is it important that the friction force in the pulley and the inertia of the pulley be small?
The friction on the pulley would not make a differnece. If the mass of the pulley was very big compared to the mases hanging on the pulley, then the small difference between the hanging masses might not be enough to cause the pulley to turn.
We do not want the pulley's frictional force to slow down or impede the motion of the two masses. A pulley with a large mass would not matter.
We do not want the pulley's frictional force to slow down or impede the motion of the two masses. If the mass of the pulley was very big compared to the mases hanging on the pulley, then the small difference between the hanging masses might not be enough to cause the pulley to turn.
c.)
Mass 1 = 20 kg and Mass 2 = 25 kg. What is the difference in the weight (gravitational force) on the two Masses?
49 N
4.9 N
245 N
196 N
d.)
A free-body diagram is a picture where an object has been removed from the system and only the forces acting on the object are included in the diagram.
True
False
The friction on the pulley would not make a differnece. If the mass of the pulley was very big compared to the mases hanging on the pulley, then the small difference between the hanging masses might not be enough to cause the pulley to turn.
We do not want the pulley's frictional force to slow down or impede the motion of the two masses. A pulley with a large mass would not matter.
We do not want the pulley's frictional force to slow down or impede the motion of the two masses. If the mass of the pulley was very big compared to the mases hanging on the pulley, then the small difference between the hanging masses might not be enough to cause the pulley to turn.
b.)The net force () on an object is 46.2 N. If the object has an inertia (mass) of 4.3 kg, what is the magnitude of the acceleration with units? (Round your answer to the nearest tenth, 0.1) (Units are important and should be included. Ex: meter per second is entered as m/s, meters square is entered as mm.)
c.)
Mass 1 = 20 kg and Mass 2 = 25 kg. What is the difference in the weight (gravitational force) on the two Masses?
49 N
4.9 N
245 N
196 N
d.)
A free-body diagram is a picture where an object has been removed from the system and only the forces acting on the object are included in the diagram.
True
False
Explanation / Answer
(a) Answer is 3rd point :- We do not want the pulley's frictional force to slow down or impede the motion of the two masses. If the mass of the pulley was very big compared to the mases hanging on the pulley, then the small difference between the hanging masses might not be enough to cause the pulley to turn.
Reasonn :- The role of the pulley is a system is to change the direction of the tension acting on the pulley. We pass then over a pulley strings or ropes. The presence of friction and inertia in the pulley modifies the transmitted tension. Therefore, to make things simple, we often use the massless and frictionless pulley.
(b) acceleration = Force / Mass
a = F/M
a = 46.2 / 4.3
a = 10.74
a = 10 m/s^2
(c) weight = mass x gravitational aceeleration
W1 = M1.g = 20 x 9.8 = 196 N
W2 = M2.g = 25 x 9.8 = 245 N
Difference between weights = W2 -W1 = 245 - 196 = 49 N (Answer is A)
(d) True
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