Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 796 · 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 ? N at 10 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?
2. 2.💪 Two children push a box to the right, one with 45 N and the other with 30 N. What is the net (total) force on the box, in newtons?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
4. 4.🔍 Which is the odd one out? (a) a truck loading ramp (b) a wheelchair ramp (c) a door stopper (d) a playground slide
5. 5.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
6. 6.⚖️ A seesaw balances. Asha (240 N) sits ? m from the pivot on one side; Meena (480 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
7. 7.🏋️ Pushing a crate 9 m took 450 J of work. What force was used, in newtons?
8. 8.💪 In which unit do we measure force? (a) litre (L) (b) metre (m) (c) newton (N) (d) second (s)
9. 9.⚖️ A seesaw balances. Ravi (450 N) sits ? m from the pivot on one side; Meena (150 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
10. 10.💪 A bag has a mass of 37 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
11. 11.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
12. 12.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 3 (c) class 2
13. 13.True or false: sand on a slippery path gives more friction. (a) True (b) False
14. 14.💪 Which force is at work: a river flows downhill? (a) friction (b) muscular force (c) gravity (d) magnetic force
15. 15.⚙️ Which simple machine is a crowbar? (a) wheel and axle (b) pulley (c) lever (d) inclined plane
16. 16.True or false: a pair of tweezers is a class 1 lever (fulcrum in the middle). (a) False (b) True
17. 17.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a bar on a pivot (d) a rope on a wheel
18. 18.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
19. 19.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
20. 20.🔍 Which is the odd one out? (a) a steering wheel (b) a flagpole rope wheel (c) a well-bucket rope wheel (d) a window blind cord
21. 21.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
22. 22.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 6 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
25. 25.💪 A box weighs 220 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
26. 26.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the pulley (d) the load
27. 27.🏋️ A force of 330 N did 3300 J of work. How many metres did the object move?
28. 28.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.💪 A force is a … (a) unit of time (b) kind of colour (c) push or a pull (d) type of sound
30. 30.True or false: a well winch handle is a wheel and axle. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a chisel (b) a door stopper (c) a bottle opener (d) the tip of a nail
32. 32.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) make new energy (c) switch off gravity (d) use a smaller force
33. 33.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) True (b) False
34. 34.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) on the fulcrum (d) far from the fulcrum
35. 35.True or false: a nut and bolt is a wheel and axle. (a) True (b) False
36. 36.True or false: pulling a cart is a pull. (a) False (b) True
37. 37.Which of these is a lever? (a) a playground slide (b) a well winch handle (c) a claw hammer on a nail (d) an axe blade
38. 38.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the bar is short (d) the fulcrum moves
39. 39.True or false: a movable pulley only changes direction. (a) True (b) False
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2

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