Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 539 · 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 rope sections holding a load means … (a) the load floats (b) no change (c) more effort needed (d) less effort needed
2. 2.True or false: a movable pulley only changes direction. (a) True (b) False
3. 3.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
5. 5.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) chalk on a gym bar (d) a grippy rubber sole
6. 6.💪 A bag has a mass of 9 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
7. 7.⚖️ A seesaw balances. Asha (110 N) sits ? m from the pivot on one side; Zoya (110 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
8. 8.⚙️ A wedge is … (a) a rope on a wheel (b) a wheel on a rod (c) a bar on a pivot (d) two ramps back to back
9. 9.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
10. 10.🏋️ A force of 450 N did 4500 J of work. How many metres did the object move?
11. 11.🏋️ A force of 110 N pushes a cart 9 m along the floor. How much work is done, in joules?
12. 12.True or false: a chisel is a wedge. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 13 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
14. 14.True or false: a bottle opener is a wedge. (a) False (b) True
15. 15.⚙️ Which simple machine is a wood screw? (a) wheel and axle (b) pulley (c) inclined plane (d) screw
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
17. 17.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
18. 18.🏋️ A force of 180 N pushes a cart 3 m along the floor. How much work is done, in joules?
19. 19.💪 Which force is at work: rubbing hands warms them? (a) friction (b) muscular force (c) magnetic force (d) gravity
20. 20.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
22. 22.Which of these is a pulley? (a) a crowbar (b) a wood screw (c) a flagpole rope wheel (d) a round doorknob
23. 23.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
24. 24.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
25. 25.💪 A force is a … (a) type of sound (b) kind of colour (c) unit of time (d) push or a pull
26. 26.Which of these is caused by friction? (a) rubbing hands warms them (b) squeezing a lemon (c) a magnet picks up pins (d) a compass needle turns
27. 27.⚖️ A seesaw balances. Zoya (140 N) sits 4 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.🔍 Which is the odd one out? (a) the tip of a nail (b) a jar lid (c) a chisel (d) a door stopper
29. 29.Which of these is a screw? (a) a seesaw (b) a crane hook block (c) a nut and bolt (d) the tip of a nail
30. 30.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 150 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
32. 32.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
33. 33.🪝 A winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts a 100 N bucket on the axle, in newtons? (ideal)
34. 34.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the load (c) the pulley (d) the fulcrum
35. 35.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
36. 36.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
37. 37.True or false: a rough doormat gives less friction. (a) True (b) False
38. 38.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a flat ramp (d) a sharp wedge
39. 39.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 120 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere

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