Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 735 · 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.💪 Two children push a box to the right, one with 10 N and the other with 20 N. What is the net (total) force on the box, in newtons?
2. 2.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
3. 3.⚙️ A wedge is … (a) a rope on a wheel (b) a wheel on a rod (c) two ramps back to back (d) a bar on a pivot
4. 4.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) friction (c) gravity (d) muscular force
5. 5.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
7. 7.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
8. 8.⚙️ Which simple machine is a truck loading ramp? (a) wheel and axle (b) inclined plane (c) wedge (d) pulley
9. 9.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.True or false: a chisel is a lever. (a) True (b) False
11. 11.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
12. 12.🏋️ A machine lifts a load of 760 N when you push with 190 N. What is its mechanical advantage (MA)?
13. 13.⚖️ A lever bar balances. The load is 210 N at 40 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) powder on a carrom board (d) a wet tiled floor
15. 15.🏋️ Pushing a crate 3 m took 210 J of work. What force was used, in newtons?
16. 16.🔍 Which is the odd one out? (a) a knife edge (b) a door stopper (c) an axe blade (d) a playground slide
17. 17.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) less effort needed (d) the load floats
18. 18.🪝 A bucket weighing 180 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
19. 19.⚖️ A seesaw balances. Zoya (? N) sits 4 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?
20. 20.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Asha (170 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.🔍 Which is the odd one out? (a) a wood screw (b) a nut and bolt (c) a jar lid (d) a wheelchair ramp
22. 22.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
23. 23.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 2 (c) class 3
24. 24.⚙️ Which simple machine is a nut and bolt? (a) wedge (b) screw (c) pulley (d) lever
25. 25.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
26. 26.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the load (d) the effort
27. 27.Which of these is a wedge? (a) a round doorknob (b) a steering wheel (c) a door stopper (d) a bottle opener
28. 28.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
29. 29.Which of these is an inclined plane? (a) a chisel (b) a knife edge (c) a seesaw (d) a wheelchair ramp
30. 30.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
31. 31.Which of these is an inclined plane? (a) a jar lid (b) a bottle opener (c) a truck loading ramp (d) a door stopper
32. 32.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
33. 33.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
34. 34.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
35. 35.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
36. 36.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 1 (c) class 3
37. 37.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
39. 39.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
40. 40.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 3 (c) class 2

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