Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 711 · 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 smooth steel slide? (a) less friction (b) more friction
2. 2.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 2 (c) class 3
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.True or false: a well-bucket rope wheel is a lever. (a) False (b) True
5. 5.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 200 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.🪝 A bucket weighing 440 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
8. 8.⚖️ A seesaw balances. Ravi (360 N) sits 3 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
10. 10.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) False (b) True
11. 11.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1280 N bucket on the axle, in newtons? (ideal)
12. 12.🔍 Which is the odd one out? (a) a road up a hill (b) a truck loading ramp (c) the tip of a nail (d) a playground slide
13. 13.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
14. 14.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) sand on a slippery path (d) a grippy rubber sole
15. 15.Which of these is a screw? (a) a screw jack (b) a road up a hill (c) a claw hammer on a nail (d) a flagpole rope wheel
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) powder on a carrom board
17. 17.Which of these is a wedge? (a) a door stopper (b) a crowbar (c) a well-bucket rope wheel (d) a jar lid
18. 18.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) both weights are equal (d) the fulcrum moves
19. 19.True or false: a movable pulley stays in one place. (a) False (b) True
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
21. 21.⚖️ A lever bar balances. The load is 1000 N at 40 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
22. 22.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
23. 23.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) doubled (c) gravity (d) unbalanced
24. 24.True or false: a tug of war is a pull. (a) True (b) False
25. 25.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) use a smaller force (d) make new energy
26. 26.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
27. 27.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) True (b) False
28. 28.🏋️ Pushing a crate 9 m took 3870 J of work. What force was used, in newtons?
29. 29.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the fulcrum (d) the load
30. 30.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
31. 31.🏋️ A force of 210 N pushes a cart 5 m along the floor. How much work is done, in joules?
32. 32.💪 A box weighs 520 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
33. 33.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Zoya (390 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.⚖️ A seesaw balances. Meena (300 N) sits 1 m from the pivot on one side; Asha (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
35. 35.Which of these is a pulley? (a) a crane hook block (b) a jar lid (c) a chisel (d) a bottle opener
36. 36.True or false: a playground slide is an inclined plane. (a) False (b) True
37. 37.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
39. 39.True or false: skating on ice gives less friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet

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