Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 591 · 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. Kabir (280 N) sits ? m from the pivot on one side; Meena (140 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
2. 2.💪 A bag has a mass of 49 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
3. 3.⚖️ A seesaw balances. Zoya (380 N) sits 1 m from the pivot on one side; Kabir (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) chalk on a gym bar (d) oil on a squeaky hinge
5. 5.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a wheel on ball bearings (d) a box pushed on carpet
6. 6.⚙️ Which simple machine is the tip of a nail? (a) wheel and axle (b) wedge (c) lever (d) pulley
7. 7.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
8. 8.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
9. 9.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
10. 10.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) chalk on a gym bar (d) skating on ice
11. 11.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the axle (c) the load (d) the effort
12. 12.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 50 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.⚖️ A seesaw balances. Ravi (720 N) sits 1 m from the pivot on one side; Kabir (180 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.🏋️ In which unit is work measured? (a) joule (J) (b) newton (N) (c) watt hour (d) metre (m)
16. 16.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
17. 17.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
18. 18.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) the bar is short (d) both weights are equal
19. 19.Which of these is caused by friction? (a) rubbing hands warms them (b) rain falls to the ground (c) a magnet picks up pins (d) squeezing a lemon
20. 20.True or false: a well winch handle is a wheel and axle. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
22. 22.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) use a smaller force (d) switch off gravity
23. 23.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) time taken (d) mass of fulcrum
24. 24.💪 A box weighs 530 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
25. 25.🏋️ A force of 300 N pushes a cart 3 m along the floor. How much work is done, in joules?
26. 26.🏋️ 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
27. 27.Which of these is a pulley? (a) a crowbar (b) a wood screw (c) a well-bucket rope wheel (d) a claw hammer on a nail
28. 28.🏋️ A force of 460 N did 1380 J of work. How many metres did the object move?
29. 29.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a smooth steel slide (d) sand on a slippery path
30. 30.Which of these is caused by magnetic force? (a) a thrown ball comes down (b) a rolling ball slows (c) a magnet picks up pins (d) pedalling a cycle
31. 31.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
33. 33.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
34. 34.⚖️ A seesaw balances. Kabir (420 N) sits 1 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.💪 A cart is pulled to the right with 85 N and to the left with 80 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
36. 36.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 6 (d) 10
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) on the pivot (d) closer to the pivot
39. 39.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
40. 40.🪝 A pulley system lifts an 870 N load with an effort of 290 N. What is its mechanical advantage (MA)?

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