A wooden block is placed on a horizontal rough table and different loads are added on…
PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
A 1.0kg wooden block is placed on a horizontal rough table and different loads are added on its top. For each load the least horizontal pull F required to start the motion is measured with a spring balance. The observations are:
(a) Load added on block (kg): 0, 1, 2, 3
(b) Corresponding pull F (N): 3.0, 5.9, 8.8, 11.9
(c) (i) Calculate the normal reaction N for each observation.
(d) (ii) Plot a graph of F (vertical axis) against N (horizontal axis) on a sheet of graph paper and draw the best-fit straight line.
(e) (iii) From the slope of the straight line, determine the coefficient of static friction between the table and the block.
(f) (iv) Using the value obtained, estimate the horizontal pull needed to just move the block when an additional 5kg is placed on it.