Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 951 · 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.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
2. 2.🔍 Which is the odd one out? (a) a chisel (b) a door stopper (c) a knife edge (d) a wood screw
3. 3.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Kabir (360 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🏋️ A force of 60 N pushes a cart 4 m along the floor. How much work is done, in joules?
5. 5.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
6. 6.True or false: a grippy rubber sole gives more friction. (a) True (b) False
7. 7.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
8. 8.Which of these is a wheel and axle? (a) a round doorknob (b) a jar lid (c) a seesaw (d) a chisel
9. 9.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a grippy rubber sole (d) a box pushed on carpet
11. 11.Which of these is caused by friction? (a) rubbing hands warms them (b) lifting a school bag (c) a magnet picks up pins (d) a compass needle turns
12. 12.⚖️ A seesaw balances. Arjun (760 N) sits ? m from the pivot on one side; Zoya (570 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
13. 13.True or false: a wet tiled floor gives less friction. (a) False (b) True
14. 14.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Meena (190 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.💪 A bag has a mass of 43 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
16. 16.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
17. 17.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a loose rope (d) a flat ramp
18. 18.🪝 A winch has a wheel of radius 16 cm and an axle of radius 2 cm. What effort on the wheel lifts a 960 N bucket on the axle, in newtons? (ideal)
19. 19.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) distance from fulcrum (d) mass of fulcrum
20. 20.⚖️ A lever bar balances. The load is 400 N at 20 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.🪝 A pulley system lifts a 160 N load with an effort of 40 N. What is its mechanical advantage (MA)?
22. 22.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
23. 23.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
24. 24.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
25. 25.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.🔍 Which is the odd one out? (a) an axe blade (b) a knife edge (c) the tip of a nail (d) a window blind cord
27. 27.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
28. 28.🏋️ A machine lifts a load of 1140 N when you push with 190 N. What is its mechanical advantage (MA)?
29. 29.🏋️ Pushing a crate 5 m took 2200 J of work. What force was used, in newtons?
30. 30.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
32. 32.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
33. 33.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
34. 34.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a tyre with deep treads (d) a box pushed on carpet
35. 35.💪 Two children push a box to the right, one with 20 N and the other with 70 N. What is the net (total) force on the box, in newtons?
36. 36.True or false: drawing up a well bucket is a push. (a) True (b) False
37. 37.🪝 A load of 600 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
39. 39.True or false: a knife edge is a wedge. (a) True (b) False
40. 40.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand

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