Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 285 · 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 seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Ravi (540 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 320 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.True or false: a wet tiled floor gives more friction. (a) True (b) False
4. 4.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Meena (170 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) shoes grip the floor (c) a river flows downhill (d) squeezing a lemon
6. 6.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
7. 7.⚖️ A lever bar balances. The load is 180 N at 10 cm from the fulcrum. The effort is 30 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
9. 9.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) gravity (d) the direction of pull
10. 10.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
11. 11.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Zoya (160 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.True or false: a wet tiled floor gives less friction. (a) True (b) False
13. 13.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) False (b) True
14. 14.True or false: a road up a hill is an inclined plane. (a) True (b) False
15. 15.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
16. 16.⚖️ A seesaw balances. Asha (180 N) sits ? m from the pivot on one side; Zoya (180 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
17. 17.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
18. 18.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
19. 19.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Kabir (300 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.True or false: pressing a doorbell is a push. (a) False (b) True
21. 21.🏋️ Pushing a crate 9 m took 1890 J of work. What force was used, in newtons?
22. 22.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) near the fulcrum (c) far from the fulcrum (d) on the rock
23. 23.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🏋️ Pushing a crate 1 m took 150 J of work. What force was used, in newtons?
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
26. 26.💪 In a tug of war, one team pulls right with 75 N and the other pulls left with 55 N. What is the size of the net force, in newtons?
27. 27.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) make new energy (d) use a smaller force
28. 28.True or false: hitting a cricket ball is a pull. (a) False (b) True
29. 29.⚖️ 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
30. 30.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
32. 32.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Ravi (280 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚙️ Which simple machine is a road up a hill? (a) inclined plane (b) screw (c) lever (d) wheel and axle
34. 34.True or false: a bottle opener is a lever. (a) True (b) False
35. 35.⚙️ Which simple machine is a wheelchair ramp? (a) wedge (b) wheel and axle (c) pulley (d) inclined plane
36. 36.🏋️ A force of 400 N pushes a cart 5 m along the floor. How much work is done, in joules?
37. 37.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
38. 38.🏋️ A force of 310 N did 3100 J of work. How many metres did the object move?
39. 39.💪 A cart is pulled to the right with 65 N and to the left with 75 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
40. 40.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the pulley (d) the effort

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