Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 677 · 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 60 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
2. 2.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 3 (d) 6
3. 3.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
4. 4.💪 A cart is pulled to the right with 65 N and to the left with 70 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
5. 5.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 3 (c) class 2
6. 6.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
7. 7.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 80 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.💪 Which force is at work: shoes grip the floor? (a) friction (b) gravity (c) muscular force (d) magnetic force
9. 9.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a wheel on ball bearings (d) sand on a slippery path
11. 11.True or false: skating on ice gives more friction. (a) True (b) False
12. 12.🏋️ Pushing a crate 6 m took 600 J of work. What force was used, in newtons?
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a box pushed on carpet (d) a grippy rubber sole
14. 14.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
15. 15.⚖️ A seesaw balances. Asha (520 N) sits 1 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
18. 18.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
19. 19.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
20. 20.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
21. 21.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) magnetism (d) gravity
22. 22.💪 Two children push a box to the right, one with 10 N and the other with 5 N. What is the net (total) force on the box, in newtons?
23. 23.💪 Which force is at work: rain falls to the ground? (a) friction (b) magnetic force (c) muscular force (d) gravity
24. 24.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) no, work stays the same (d) only on Mondays
25. 25.🏋️ Pushing a crate 3 m took 1140 J of work. What force was used, in newtons?
26. 26.🔍 Which is the odd one out? (a) a crane hook block (b) a well-bucket rope wheel (c) a flagpole rope wheel (d) a crowbar
27. 27.🪝 A load of 630 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
28. 28.True or false: a well winch handle is a screw. (a) True (b) False
29. 29.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts an 800 N bucket on the axle, in newtons? (ideal)
30. 30.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Meena (260 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🏋️ A force of 90 N pushes a cart 1 m along the floor. How much work is done, in joules?
32. 32.🔍 Which is the odd one out? (a) a knife edge (b) a door stopper (c) an axe blade (d) a wood screw
33. 33.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 100 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.Which of these is a screw? (a) an axe blade (b) a jar lid (c) a crane hook block (d) a truck loading ramp
35. 35.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) less effort needed (d) no change
37. 37.⚙️ Which simple machine is a playground slide? (a) inclined plane (b) wheel and axle (c) pulley (d) lever
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
39. 39.⚙️ A wedge is … (a) a rope on a wheel (b) two ramps back to back (c) a wheel on a rod (d) a bar on a pivot
40. 40.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem

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