Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 460 · 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 lever bar balances. The load is 120 N at 40 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
3. 3.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 120 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
5. 5.🏋️ Pushing a crate 6 m took 780 J of work. What force was used, in newtons?
6. 6.True or false: a bottle opener is a lever. (a) False (b) True
7. 7.Which of these is a lever? (a) a knife edge (b) a claw hammer on a nail (c) a well winch handle (d) the tip of a nail
8. 8.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
9. 9.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
10. 10.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
11. 11.True or false: sand on a slippery path gives more friction. (a) False (b) True
12. 12.⚖️ A lever bar balances. The load is 480 N at 50 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 40 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
14. 14.💪 A cart is pulled to the right with 85 N and to the left with 100 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
15. 15.⚖️ Which class of lever is your forearm? (a) class 3 (b) class 1 (c) class 2
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
17. 17.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Zoya (380 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 1 (c) class 2
19. 19.🪝 A pulley system lifts a 270 N load with an effort of 90 N. What is its mechanical advantage (MA)?
20. 20.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Asha (480 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
22. 22.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 2 (c) class 3
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.True or false: a broom when sweeping is a class 2 lever (load in the middle). (a) False (b) True
25. 25.True or false: powder on a carrom board gives less friction. (a) True (b) False
26. 26.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 3 (d) 6
27. 27.Which of these is caused by gravity? (a) a compass needle turns (b) squeezing a lemon (c) lifting a school bag (d) rain falls to the ground
28. 28.💪 Which force is at work: pedalling a cycle? (a) friction (b) gravity (c) magnetic force (d) muscular force
29. 29.Which of these is caused by gravity? (a) a fridge magnet sticks (b) a rolling ball slows (c) brakes stop a bicycle (d) an apple falls down
30. 30.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
31. 31.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
32. 32.Which of these is a screw? (a) the tip of a nail (b) a well winch handle (c) a bottle cap (d) a door stopper
33. 33.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) unbalanced (c) balanced (d) doubled
34. 34.🔍 Which is the odd one out? (a) a knife edge (b) a screw jack (c) a bottle cap (d) a nut and bolt
35. 35.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
36. 36.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
37. 37.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a kind of wheel (d) a bent lever
38. 38.🔍 Which is the odd one out? (a) a window blind cord (b) a crane hook block (c) a claw hammer on a nail (d) a well-bucket rope wheel
39. 39.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the load (c) nothing (d) the effort
40. 40.Which of these is caused by friction? (a) an apple falls down (b) lifting a school bag (c) rubbing hands warms them (d) a thrown ball comes down

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