Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 931 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 280 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.💪 Two children push a box to the right, one with 45 N and the other with 55 N. What is the net (total) force on the box, in newtons?
4. 4.💪 Two children push a box to the right, one with 55 N and the other with 60 N. What is the net (total) force on the box, in newtons?
5. 5.⚖️ A lever bar balances. The load is 70 N at 10 cm from the fulcrum. The effort is 10 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 100 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚖️ A seesaw balances. Meena (300 N) sits 4 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) a rope on a wheel (d) two ramps back to back
9. 9.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
10. 10.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
11. 11.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
12. 12.⚖️ A seesaw balances. Ravi (340 N) sits 3 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.⚙️ Which simple machine is a chisel? (a) lever (b) screw (c) inclined plane (d) wedge
14. 14.💪 Which can a force NOT do? (a) change its colour (b) stop it moving (c) change its shape (d) start it moving
15. 15.🏋️ Pushing a crate 1 m took 160 J of work. What force was used, in newtons?
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
17. 17.⚖️ A seesaw balances. Arjun (480 N) sits 4 m from the pivot on one side; Asha (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.💪 In a tug of war, one team pulls right with 100 N and the other pulls left with 80 N. What is the size of the net force, in newtons?
19. 19.💪 A cart is pulled to the right with 45 N and to the left with 45 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
20. 20.True or false: pulling up your socks is a push. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
22. 22.⚖️ A lever bar balances. The load is 350 N at ? cm from the fulcrum. The effort is 150 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
24. 24.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
25. 25.🏋️ A force of 390 N pushes a cart 2 m along the floor. How much work is done, in joules?
26. 26.🏋️ A force of 200 N pushes a cart 2 m along the floor. How much work is done, in joules?
27. 27.True or false: a wet tiled floor gives more friction. (a) True (b) False
28. 28.🪝 A pulley system lifts an 80 N load with an effort of 40 N. What is its mechanical advantage (MA)?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
31. 31.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
32. 32.💪 Two children push a box to the right, one with 55 N and the other with 30 N. What is the net (total) force on the box, in newtons?
33. 33.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Meena (520 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) the fulcrum moves (d) turning effects match
35. 35.⚙️ Which simple machine is a bottle opener? (a) screw (b) wheel and axle (c) pulley (d) lever
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
37. 37.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) pedalling a cycle (c) lifting a school bag (d) a thrown ball comes down
38. 38.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
39. 39.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
40. 40.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) nothing

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