Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 50 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
2. 2.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 50 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.🏋️ Pushing a crate 2 m took 60 J of work. What force was used, in newtons?
4. 4.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
6. 6.🏋️ Pushing a crate 9 m took 4140 J of work. What force was used, in newtons?
7. 7.🏋️ Pushing a crate 2 m took 40 J of work. What force was used, in newtons?
8. 8.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 3 (c) class 1
9. 9.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
10. 10.⚖️ A lever bar balances. The load is 480 N at 20 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.🏋️ A force of 420 N did 1680 J of work. How many metres did the object move?
12. 12.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) anywhere (d) on the pivot
13. 13.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) the bar is short (d) both weights are equal
14. 14.💪 A bag has a mass of 57 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
16. 16.💪 Two children push a box to the right, one with 95 N and the other with 35 N. What is the net (total) force on the box, in newtons?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a smooth steel slide (d) a wheel on ball bearings
19. 19.⚙️ Which simple machine is a nut and bolt? (a) inclined plane (b) screw (c) wedge (d) pulley
20. 20.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
21. 21.💪 In a tug of war, one team pulls right with 40 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
22. 22.⚙️ Which simple machine is the tip of a nail? (a) inclined plane (b) wedge (c) pulley (d) screw
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
26. 26.💪 Which force is at work: pedalling a cycle? (a) muscular force (b) friction (c) magnetic force (d) gravity
27. 27.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
28. 28.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) make new energy (d) switch off gravity
29. 29.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) True (b) False
30. 30.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
31. 31.True or false: a rough doormat gives more friction. (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
33. 33.Which of these is a pulley? (a) a well-bucket rope wheel (b) an axe blade (c) a crowbar (d) a round doorknob
34. 34.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
35. 35.Which of these is caused by magnetic force? (a) a rolling ball slows (b) a magnet picks up pins (c) rubbing hands warms them (d) squeezing a lemon
36. 36.💪 In a tug of war, one team pulls right with 55 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
37. 37.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
38. 38.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly
39. 39.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a grippy rubber sole (d) a rough doormat
40. 40.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel

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