Physics WAEC / WASSCE 2011 Mechanics and Properties of Matter
You are provided with a wooden block to which a hook is fixed, a set of masses, spring balance, and other necessary materials. Using the diagram above as a guide, carry out the following instructions. Record the mass \(m_0\), indicated on the wooden block. Place the block on the table. Attach the spring balance to the hook. Pull the spring balance horizontally with a gradual increase in force until the block just starts to move Record the spring balance reading F. Repeat the procedure by placing in turn mass m=200, 400, 600, and 800g on top of the block. In each case, read and record the corresponding value of F. Evaluate M = \(m_0\) + m and R = \(\frac{m}{100}\) in each case Tabulate your readings. Plot a graph with F on the vertical axis and R on the horizontal axis Determine the slope, s, of the graph. State two precautions taken to ensure accurate results. (b)i. Define coefficient of static friction. ii. A block of wood of mass 0.5 kg is pulled horizontally on a table by a force of 2.5 N. Calculate the coefficient of static friction between the two surfaces.(g = 10ms\(^{-2}\))