Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 630 · 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. Ravi (? N) sits 4 m from the pivot on one side; Arjun (600 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.True or false: a flagpole rope wheel is a wheel and axle. (a) False (b) True
3. 3.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) gravity (d) unbalanced
4. 4.Which of these is an inclined plane? (a) a well-bucket rope wheel (b) a steering wheel (c) a playground slide (d) a seesaw
5. 5.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a kind of wheel (d) a bent lever
6. 6.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
7. 7.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum
8. 8.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the direction of pull (d) the colour of rope
9. 9.Which of these is a lever? (a) a knife edge (b) a well winch handle (c) a bottle opener (d) a truck loading ramp
10. 10.⚙️ Which simple machine is a bottle opener? (a) inclined plane (b) wedge (c) pulley (d) lever
11. 11.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) closer to the pivot (d) anywhere
12. 12.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
13. 13.💪 Which force is at work: a magnet picks up pins? (a) muscular force (b) gravity (c) friction (d) magnetic force
14. 14.💪 In which unit do we measure force? (a) litre (L) (b) metre (m) (c) second (s) (d) newton (N)
15. 15.True or false: hitting a cricket ball is a pull. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
17. 17.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
18. 18.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
20. 20.⚙️ Which simple machine is a nutcracker? (a) wedge (b) screw (c) pulley (d) lever
21. 21.⚖️ A lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 40 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
23. 23.💪 A box weighs 540 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
24. 24.⚖️ A lever bar balances. The load is 240 N at 20 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
26. 26.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
27. 27.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
28. 28.True or false: a seesaw is a pulley. (a) False (b) True
29. 29.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
30. 30.True or false: a smooth steel slide gives more friction. (a) False (b) True
31. 31.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.True or false: a rough doormat gives less friction. (a) True (b) False
33. 33.True or false: a movable pulley halves the effort. (a) False (b) True
34. 34.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.🔍 Which is the odd one out? (a) a well winch handle (b) a window blind cord (c) a flagpole rope wheel (d) a well-bucket rope wheel
37. 37.Which of these is a lever? (a) a claw hammer on a nail (b) a screw jack (c) a jar lid (d) a knife edge
38. 38.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
39. 39.True or false: sand on a slippery path gives more friction. (a) False (b) True
40. 40.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 200 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?

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