Level: JHS, Basic 8 | Subject: Integrated Science | Strand: Forces and Energy | Topic: Force and Motion
Read the summary notes first, then try these questions. Go back to the summary notes for this topic.
Part A has 20 tick-box questions. Part B has 5 essay questions with a marking guide at the bottom.
Test Yourself: 20 Objective Questions
Tick one answer for each question, then press Review answer. If your answer is wrong, it will be marked first, then the correct answer will show in green.
Essay Questions
- (a) What is a force? (b) State the unit of force. (c) List three effects of a force. (5 marks)
- Give three useful effects and two harmful effects of friction. Mention two ways of reducing friction. (7 marks)
- A boy runs 100 m in 20 s. (a) Calculate his speed. (b) A car goes from 0 to 30 m/s in 6 s. Calculate its acceleration. (4 marks)
- A trolley of mass 20 kg is pushed with a resultant force of 50 N. (a) State Newton’s second law. (b) Calculate the acceleration. (4 marks)
- Explain the difference between (a) distance and displacement (b) speed and velocity. (5 marks)
Essay Questions: Marking Guide for Teachers and Parents
- (a) A push or a pull (1). (b) Newton (1). (c) Any three effects (1 mark each): start motion, stop motion, speed up, slow down, change direction, change shape.
- Useful effects (1 mark each, any three): walking, braking, tyre grip, holding objects. Harmful effects (1 mark each, any two): wears out parts, wastes energy as heat. Reducing friction (1 mark each, any two): oil or grease, polishing, ball bearings, wheels.
- (a) Speed = distance / time (1); 100 / 20 = 5 m/s (1). (b) a = (v – u) / t (1); (30 – 0) / 6 = 5 m/s squared (1).
- (a) The resultant force on an object equals its mass multiplied by its acceleration (2). (b) a = F / m = 50 / 20 (1) = 2.5 m/s squared (1).
- (a) Distance is the total path covered, with no direction. Displacement is the distance in a stated direction (2). (b) Speed has size only. Velocity has size and direction (2). Give 1 mark for a correct example.
Education Always (education.inspiringalways.com). Original practice questions, not official WAEC or BECE questions.