Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 156 · 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.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Meena (480 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) friction (c) gravity (d) muscular force
3. 3.Which of these is a screw? (a) a chisel (b) a playground slide (c) a crowbar (d) a bottle cap
4. 4.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
5. 5.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
6. 6.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 6 (d) 10
7. 7.True or false: a water tap handle is a pulley. (a) True (b) False
8. 8.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
9. 9.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
10. 10.🏋️ Pushing a crate 10 m took 900 J of work. What force was used, in newtons?
11. 11.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the pulley (c) the fulcrum (d) the load
12. 12.💪 Two children push a box to the right, one with 20 N and the other with 45 N. What is the net (total) force on the box, in newtons?
13. 13.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) mass of fulcrum (d) colour of bar
14. 14.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
16. 16.💪 A bag has a mass of 24 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
17. 17.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Ravi (110 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.True or false: a tug of war is a push. (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
20. 20.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
21. 21.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
22. 22.🏋️ Pushing a crate 4 m took 200 J of work. What force was used, in newtons?
23. 23.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
24. 24.💪 Which can a force NOT do? (a) change its shape (b) start it moving (c) change its colour (d) stop it moving
25. 25.💪 In a tug of war, one team pulls left with 90 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
26. 26.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) gravity (d) the direction of pull
27. 27.True or false: a door stopper is a lever. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) a wheel on ball bearings (d) powder on a carrom board
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
30. 30.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) far from the fulcrum (c) near the fulcrum (d) on the fulcrum
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on a carpet than on ice?
32. 32.True or false: a wet tiled floor gives more friction. (a) False (b) True
33. 33.🏋️ A force of 460 N pushes a cart 5 m along the floor. How much work is done, in joules?
34. 34.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
35. 35.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) False (b) True
36. 36.⚖️ A lever bar balances. The load is 40 N at 20 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.True or false: opening a drawer is a pull. (a) False (b) True
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 110 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
40. 40.🔍 Which is the odd one out? (a) a window blind cord (b) a round doorknob (c) a steering wheel (d) a water tap handle

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