Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 742 · 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.Which of these is a screw? (a) a wheelchair ramp (b) a steering wheel (c) a water tap handle (d) a wood screw
2. 2.⚖️ A lever bar balances. The load is 420 N at ? cm from the fulcrum. The effort is 120 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Asha (300 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.⚖️ 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
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 50 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
6. 6.🏋️ A force of 400 N did 2800 J of work. How many metres did the object move?
7. 7.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
9. 9.True or false: plucking a mango is a push. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a box pushed on carpet (d) a rough doormat
11. 11.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) less effort needed (d) no change
12. 12.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?
13. 13.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) newton (N) (d) watt hour
14. 14.True or false: a wet tiled floor gives less friction. (a) False (b) True
15. 15.Which of these is a wedge? (a) a seesaw (b) a crane hook block (c) a screw jack (d) a knife edge
16. 16.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 700 N bucket on the axle, in newtons? (ideal)
18. 18.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.💪 A box weighs 30 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
21. 21.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Arjun (720 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🏋️ A force of 150 N pushes a cart 5 m along the floor. How much work is done, in joules?
23. 23.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
24. 24.🪝 A bucket weighing 180 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.⚙️ Which simple machine is a wheelchair ramp? (a) lever (b) wheel and axle (c) inclined plane (d) screw
27. 27.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) litre (L) (d) newton (N)
28. 28.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
29. 29.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
30. 30.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) mass of fulcrum (d) time taken
31. 31.True or false: chalk on a gym bar gives less friction. (a) True (b) False
32. 32.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a smaller rod (axle) (d) a sharp wedge
33. 33.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
34. 34.True or false: powder on a carrom board gives more friction. (a) False (b) True
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
36. 36.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 3 (c) class 1
37. 37.⚖️ A lever bar balances. The load is 500 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.💪 Which force is at work: an apple falls down? (a) gravity (b) muscular force (c) friction (d) magnetic force
39. 39.💪 A cart is pulled to the right with 55 N and to the left with 55 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet

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