Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 208 · 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.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 80 N. What is the size of the net force, in newtons?
2. 2.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Kabir (170 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) anywhere (d) on the pivot
4. 4.💪 A cart is pulled to the right with 20 N and to the left with 30 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
5. 5.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) make new energy (d) stop all friction
6. 6.⚖️ A lever bar balances. The load is 140 N at ? cm from the fulcrum. The effort is 60 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.⚙️ Which simple machine is a well-bucket rope wheel? (a) lever (b) wedge (c) pulley (d) wheel and axle
8. 8.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 160 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.True or false: hitting a cricket ball is a pull. (a) False (b) True
10. 10.True or false: a claw hammer on a nail is a lever. (a) False (b) True
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
13. 13.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
15. 15.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
16. 16.True or false: a grippy rubber sole gives less friction. (a) True (b) False
17. 17.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) far from the fulcrum (c) on the fulcrum (d) on the rock
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
19. 19.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
20. 20.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
21. 21.💪 Two children push a box to the right, one with 10 N and the other with 60 N. What is the net (total) force on the box, in newtons?
22. 22.⚙️ Which simple machine is a bottle opener? (a) screw (b) inclined plane (c) lever (d) wheel and axle
23. 23.💪 In a tug of war, one team pulls right with 60 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
24. 24.True or false: a water tap handle is a wheel and axle. (a) False (b) True
25. 25.Which of these is caused by magnetic force? (a) a rolling ball slows (b) a thrown ball comes down (c) a magnet picks up pins (d) a river flows downhill
26. 26.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) two ramps back to back (d) a bar on a pivot
27. 27.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) True (b) False
28. 28.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
30. 30.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) time taken (d) mass of fulcrum
31. 31.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
32. 32.💪 A box weighs 560 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
33. 33.True or false: a seesaw is a lever. (a) True (b) False
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
35. 35.⚖️ A seesaw balances. Zoya (340 N) sits ? m from the pivot on one side; Asha (170 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
36. 36.🔍 Which is the odd one out? (a) a road up a hill (b) a door stopper (c) a playground slide (d) a wheelchair ramp
37. 37.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) gravity (c) friction (d) magnetic force
38. 38.True or false: pressing a doorbell is a push. (a) True (b) False
39. 39.🏋️ A force of 500 N pushes a cart 1 m along the floor. How much work is done, in joules?
40. 40.⚖️ A seesaw balances. Arjun (800 N) sits 2 m from the pivot on one side; Meena (400 N) sits ? m from the pivot on the other side. What is the missing distance in metres?

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