Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 120 · 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.True or false: a beam balance is a class 3 lever (effort in the middle). (a) True (b) False
2. 2.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
3. 3.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.⚖️ A lever bar balances. The load is 900 N at ? cm from the fulcrum. The effort is 200 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.⚖️ A seesaw balances. Ravi (400 N) sits ? m from the pivot on one side; Zoya (400 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
7. 7.🪝 A load of 900 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.⚖️ A seesaw balances. Arjun (110 N) sits 2 m from the pivot on one side; Zoya (220 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
9. 9.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
10. 10.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the effort (d) the fulcrum
11. 11.True or false: a grippy rubber sole gives more friction. (a) True (b) False
12. 12.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
13. 13.Which of these is a pulley? (a) a chisel (b) a nut and bolt (c) a bottle opener (d) a well-bucket rope wheel
14. 14.🔍 Which is the odd one out? (a) the tip of a nail (b) a nutcracker (c) an axe blade (d) a knife edge
15. 15.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) make new energy (d) switch off gravity
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
17. 17.Which of these is a screw? (a) a bottle cap (b) a well-bucket rope wheel (c) a crane hook block (d) a claw hammer on a nail
18. 18.💪 In a tug of war, one team pulls left with 40 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
19. 19.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
20. 20.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
21. 21.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) friction (c) gravity (d) muscular force
22. 22.Which of these is a lever? (a) a round doorknob (b) a seesaw (c) a truck loading ramp (d) an axe blade
23. 23.🏋️ Pushing a crate 8 m took 2800 J of work. What force was used, in newtons?
24. 24.True or false: a movable pulley halves the effort. (a) False (b) True
25. 25.💪 In a tug of war, one team pulls left with 70 N and the other pulls right with 50 N. What is the size of the net force, in newtons?
26. 26.Which of these is caused by muscular force? (a) a magnet picks up pins (b) a thrown ball comes down (c) a compass needle turns (d) squeezing a lemon
27. 27.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
28. 28.⚖️ A seesaw balances. Meena (570 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?
29. 29.🏋️ A force of 100 N pushes a cart 10 m along the floor. How much work is done, in joules?
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
31. 31.Which of these is caused by muscular force? (a) a thrown ball comes down (b) a fridge magnet sticks (c) shoes grip the floor (d) pedalling a cycle
32. 32.True or false: a well winch handle is a pulley. (a) False (b) True
33. 33.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 10 (d) 12
34. 34.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
35. 35.🪝 A load of 1040 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
36. 36.💪 A force is a … (a) kind of colour (b) push or a pull (c) unit of time (d) type of sound
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
38. 38.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
39. 39.⚖️ A seesaw balances. Ravi (420 N) sits 4 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice

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