A.) In the friction experiment, what is the least mass you have to attach to the

Question

A.) In the friction experiment, what is the least mass you have to attach to the weight hanger for it to start moving without giving it a push?

B). What is the least amount of weight you have to attach to weight hanger for it to start moving after giving it a slight push?

Given mass of friction block= 1,300 grams Mass of weight hanger= 50 grams Coefficient of static friction= 0.25 and Coefficient of kinetic friction= 0.20

A. 225 g

B. 160 g

C. 210 g

D. 275 g

C.) A wooden block of 20 x 40 x 80 cm is to be dragged along the floor by a force applied horizontally. Friction is present between the block and the floor. The surface on each side of the block is similar. In case ’B’ a weight is placed on top of the block.

In which case will the normal force from the floor be higher?

Explanation / Answer

1)One of the aim of this experiment is to calculate the static friction.For the block to start moving the tension in the string attached with the friction block must be equal to the static friction.The value of the static friction is (coefficient of static friction*Normal force).This tension is also equal to mg.Equating mg and static friction force the minimum mass can be calculated.

2)mg+50g=.25*1.3*g

Hence m=275 grams

3)Normal force from the floor depends on the weight in contact with the floor.I f another object is kept above the mass it will not affect the normal force exerted by the ground

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