Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 618 · 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 lever bar balances. The load is 480 N at 50 cm from the fulcrum. The effort is 400 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
4. 4.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) magnetic force (c) gravity (d) friction
5. 5.💪 A box weighs 310 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
6. 6.⚖️ A seesaw balances. Asha (440 N) sits 3 m from the pivot on one side; Ravi (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.💪 Which can a force NOT do? (a) stop it moving (b) change its shape (c) start it moving (d) change its colour
8. 8.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
9. 9.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) a thrown ball comes down (c) squeezing a lemon (d) shoes grip the floor
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
11. 11.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 80 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.Which of these is a wedge? (a) a wheelchair ramp (b) a crane hook block (c) a steering wheel (d) a knife edge
13. 13.True or false: a steering wheel is a wheel and axle. (a) False (b) True
14. 14.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
15. 15.Which of these is caused by magnetic force? (a) a rolling ball slows (b) pedalling a cycle (c) a compass needle turns (d) rain falls to the ground
16. 16.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) the bar is short (d) turning effects match
17. 17.🏋️ An 11 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
18. 18.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
19. 19.⚙️ Which simple machine is a window blind cord? (a) inclined plane (b) pulley (c) wheel and axle (d) wedge
20. 20.🏋️ Pushing a crate 7 m took 1960 J of work. What force was used, in newtons?
21. 21.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
22. 22.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
23. 23.True or false: your forearm is a class 1 lever (fulcrum in the middle). (a) True (b) False
24. 24.🏋️ A 6 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
26. 26.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 3 (c) class 2
27. 27.🪝 A pulley system lifts a 420 N load with an effort of 140 N. What is its mechanical advantage (MA)?
28. 28.💪 Which force is at work: rain falls to the ground? (a) friction (b) muscular force (c) magnetic force (d) gravity
29. 29.⚖️ A seesaw balances. Kabir (200 N) sits ? m from the pivot on one side; Asha (400 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
30. 30.Which of these is caused by muscular force? (a) a fridge magnet sticks (b) shoes grip the floor (c) pedalling a cycle (d) an apple falls down
31. 31.💪 A cart is pulled to the right with 100 N and to the left with 105 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
32. 32.⚖️ A seesaw balances. Kabir (190 N) sits 3 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.Which of these is caused by gravity? (a) a rolling ball slows (b) a magnet picks up pins (c) rubbing hands warms them (d) a thrown ball comes down
34. 34.⚙️ Which simple machine is a bottle opener? (a) screw (b) pulley (c) wedge (d) lever
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
36. 36.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
38. 38.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a window blind cord (c) a seesaw (d) a flagpole rope wheel
39. 39.💪 A box weighs 490 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
40. 40.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a steering wheel (c) a water tap handle (d) a round doorknob

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