Physics Practice Tests – Work, Energy and Power (Questions with Answers and Explanations)

The diagram above illustrates a force-distance graph for the motion of a wooden block. Determine the workdone on the block when moved through a distance of 5 m. (WASSCE 2016)

A car travelling at 30 ms^-1 overcomes a frictional resistance of 100 N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kw] (WASSCE 2014)

A. 0.23 hp      B. 0.40 hp      C. 4.00 hp      D. 4.40 hp

A car travelling with a uniform velocity of 30 ms^-1 along a horizontal road overcomes a constant frictional force of 600 N. Calculate the power of the engine of the car. (WASSCE 2008)

A. 18 kW    B. 20 kW   C. 180 kW   D. 200 kW

The area under a force — distance curve is ______ (JAMB 2021)

A. work    B. impulse    C. pressure    D. momentum

A bob of weight 0.1 N hangs from a massless string of length 50 cm. A variable horizontal force which increases from zero is applied to pull the bob until the string makes an angle of 60^o with the vertical. The work done is _____ (JAMB 2010)

A. 0.075 J   B. 0.025 J   C. 0.500 J    D. 0.250 J