What physical quantities can be measured or calculated to help determine the coe

Question

What physical quantities can be measured or calculated to help determine the coefficient of static friction? (If you are unsure of the answers to question 9.1.1 and 9.1.2. skip to question 9.1.3. Later return to answer question 9.1.1 and 9.1.2): Of this physical quantities, which will be easier to measure than calculate? How will you measure it?: It is not possible to directly measure the force of friction. Therefore, how can you set up the equipment to measure the force of friction indirectly?: Imagine measuring the force needed to push an object across a rough surface. At what point are you measuring the maximum static frictional force?: Up until and including the point of the maximum static frictional force, what is the relationship between the opposing forces that you measure?: Is it possible to apply a force to an object and still have it move with constant speed (that is not zero)? If so. how is that possible? What forces are involved?: What measurement(s) are similar in the determination of the coefficient of kinetic friction and the coefficient of static friction?:

Explanation / Answer

9.1.3 The friction force cannot be directly measured as it is a contact force acting on a surface and forces acting on surface cannot be measured directly. To measure friction indirectly

we could have an experiment top push a box on floow, and we could calculate the force of friction by measuring the resultaln acceleration and the applied force on the box

then F - f = ma

so, f = F - ma

9.1.4 when the object is just about to bulge, we are measuring the maximum value of the static friction on the box

9.1.5 so as the box is not moving

F = f [ f is the force of static friction at any point and F is the applied force]

9.1.1 so, measuruing the mass of the object, acceleration of the object and applied force can give us the coefficient of friciton of the object

9.1.2 mass of object is easier to measure than to calculate

applied force is easier to measure than to calculate

9.2.1 yes it is possible to apply a force on object and it still; moves with constant velocity, here a hidden force of friction f, comes into play

so from force balance, f = F ( F is applied force )

9.2.2 in the measurement of kinetic friction, we have to measure the acceleration, rest all the measurements are same

we can work withou this as well, then we dont have any differemnce in measurements from the static friction coefficient measurements exxcept that the b ox is moving in this case with constant velocity

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