Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 629 · 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 rises with the load? (a) a movable pulley (b) a fixed pulley
2. 2.True or false: a door stopper is a wedge. (a) True (b) False
3. 3.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
4. 4.Which of these is caused by friction? (a) a rolling ball slows (b) rain falls to the ground (c) a magnet picks up pins (d) squeezing a lemon
5. 5.True or false: closing a drawer is a pull. (a) False (b) True
6. 6.⚖️ A seesaw balances. Ravi (300 N) sits 1 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
8. 8.⚖️ A seesaw balances. Kabir (760 N) sits 2 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.🏋️ A 12 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.🪝 A load of 440 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
11. 11.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) both weights are equal (d) the fulcrum moves
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
13. 13.🔍 Which is the odd one out? (a) a door stopper (b) an axe blade (c) a flagpole rope wheel (d) a chisel
14. 14.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 110 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) doubled (c) balanced (d) gravity
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
18. 18.Which of these is a wheel and axle? (a) a jar lid (b) an axe blade (c) a round doorknob (d) a window blind cord
19. 19.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
20. 20.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the fulcrum (d) the load
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
22. 22.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
23. 23.⚖️ A seesaw balances. Asha (380 N) sits 3 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) muscular force (c) gravity (d) friction
25. 25.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
26. 26.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
27. 27.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Asha (450 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
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 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
30. 30.True or false: pressing a doorbell is a pull. (a) False (b) True
31. 31.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
32. 32.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 50 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
34. 34.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) sand on a slippery path (d) chalk on a gym bar
36. 36.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a bent lever (d) a tiny pulley
37. 37.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
38. 38.💪 Which force pulls everything towards the Earth? (a) magnetism (b) friction (c) wind (d) gravity
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
40. 40.🏋️ A force of 460 N pushes a cart 10 m along the floor. How much work is done, in joules?

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