Neco Model Questions Vol1 2018 Physics Question 4

A wooden block of mass 0.800 kg is placed on a smooth wooden inclined plane. The plane can be set to different angles. A spring balance is attached to the block and the balance is pulled parallel to the plane until the block is just about to move up the plane. The reading on the spring balance at the threshold of motion is recorded. The experiment is repeated for three different angles of the plane as shown in the table below. | Angle (°) | Spring‑balance reading (N) | |-----------|-----------------------------| | 15 | 2.5 | | 20 | 3.0 | | 25 | 3.6 | Assume the acceleration due to gravity g = 9.8 m s⁻² and neglect air resistance.