Kabulonga Girls Secondary School Grade 11BS2A Physics Mid – term test Term II, 2020 1. 2. 3. A car with an engine force of 50, 000N covers a distance of 50m in 10s. Assuming a frictional force of 5000N acts between the tyres and the car (a) Calculate the net force (Fnet) that causes motion. (b) Calculate the work done by the car in covering a distance of 50m. (c) What is the maximum speed of the car? (d) The kinetic energy of the car if its mass is 180, 000 Kg. (e) Find the power output of the car. A bike rider approaches a hill with a speed of 8m/s. the total mass of the rider and the bike is 65Kg. (a) Find the total kinetic energy of the bike and ridder. (b) The ridder coasts up the hill. Assuming there is no friction, at what height will the bike come to a stop? (a) Draw the energy flow for energy conversions in hydroelectric generation. (b) Explain the meaning of the term ‘conservation of energy’. (c) State the law of energy conservation. (d) The energy output of a system is 238, 000J as heat. If the energy input is 320, 000J as chemical energy, calculate the efficiency of the system. Kabulonga Girls Secondary School Grade 11BS2B Physics Mid – term test Term II, 2020 1. A car with an engine force of 625, 000N covers a distance of 100m in 25s. Assuming a frictional force of 25000N acts between the tyres and the car (a) Calculate the net force (Fnet) that causes motion. (b) Calculate the work done by the car in covering a distance of 100m. (c) What is the maximum speed of the car? (d) The kinetic energy of the car if its mass is 7, 500, 000. (e) Find the power output of the car. 2. A bike rider approaches a hill with a speed of 9m/s. the total mass of the rider and the bike is 75Kg. (c) Find the total kinetic energy of the bike and ridder. (d) The ridder coasts up the hill. Assuming there is no friction at what height will the bike come to a stop? (a) Draw the energy flow for energy conversions in hydroelectric generation. (b) Explain the meaning of the term ‘conservation of energy’. (c) State the law of energy conservation. (d) The energy output of a system is 238J as heat. If the energy input is 320J as chemical energy, calculate the efficiency of the system. 3.
