Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 826 · 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.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
2. 2.🏋️ A machine lifts a load of 640 N when you push with 160 N. What is its mechanical advantage (MA)?
3. 3.🔍 Which is the odd one out? (a) a seesaw (b) a round doorknob (c) a crowbar (d) a nutcracker
4. 4.⚖️ A lever bar balances. The load is 100 N at 30 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?
5. 5.Which of these is a wedge? (a) the tip of a nail (b) a claw hammer on a nail (c) a crowbar (d) a well-bucket rope wheel
6. 6.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
8. 8.🛞 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 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
9. 9.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Ravi (450 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.⚖️ A lever bar balances. The load is 280 N at 20 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Zoya (100 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
13. 13.True or false: a wet tiled floor gives less friction. (a) True (b) False
14. 14.💪 A bag has a mass of 8 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
15. 15.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
16. 16.⚙️ Which simple machine is a claw hammer on a nail? (a) wheel and axle (b) pulley (c) lever (d) inclined plane
17. 17.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 150 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.🏋️ A 7 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
19. 19.💪 Two children push a box to the right, one with 70 N and the other with 40 N. What is the net (total) force on the box, in newtons?
20. 20.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) friction (c) gravity (d) muscular force
21. 21.True or false: a tug of war is a push. (a) True (b) False
22. 22.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
23. 23.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) powder on a carrom board (d) a wet tiled floor
24. 24.True or false: a claw hammer on a nail is a lever. (a) False (b) True
25. 25.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) the fulcrum moves (d) both weights are equal
26. 26.💪 A box weighs 100 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
28. 28.True or false: plucking a mango is a pull. (a) True (b) False
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
30. 30.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
31. 31.Which of these is a wheel and axle? (a) an axe blade (b) a round doorknob (c) a nutcracker (d) a flagpole rope wheel
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
33. 33.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
34. 34.🏋️ Pushing a crate 5 m took 450 J of work. What force was used, in newtons?
35. 35.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) balanced (c) doubled (d) gravity
36. 36.⚖️ A lever bar balances. The load is 200 N at 30 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.Which of these is a pulley? (a) a crowbar (b) a bottle opener (c) a water tap handle (d) a crane hook block
38. 38.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the colour of rope (c) gravity (d) the size of the load
39. 39.Which of these is a pulley? (a) a truck loading ramp (b) a well-bucket rope wheel (c) a round doorknob (d) an axe blade
40. 40.🔍 Which is the odd one out? (a) a water tap handle (b) a nut and bolt (c) a round doorknob (d) a steering wheel

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