Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 14 · 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.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.True or false: opening a drawer is a pull. (a) False (b) True
3. 3.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) less effort needed (d) more effort needed
4. 4.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
5. 5.🏋️ A force of 110 N did 220 J of work. How many metres did the object move?
6. 6.🏋️ A force of 150 N did 450 J of work. How many metres did the object move?
7. 7.True or false: plucking a mango is a pull. (a) True (b) False
8. 8.Which of these is caused by muscular force? (a) lifting a school bag (b) an apple falls down (c) rain falls to the ground (d) a thrown ball comes down
9. 9.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 30 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
11. 11.Which of these is a wedge? (a) a steering wheel (b) a bottle cap (c) a well winch handle (d) a knife edge
12. 12.True or false: kicking a football is a pull. (a) False (b) True
13. 13.⚙️ Which simple machine is a road up a hill? (a) wedge (b) inclined plane (c) lever (d) pulley
14. 14.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a kind of wheel (d) a tiny pulley
15. 15.True or false: skating on ice gives more friction. (a) False (b) True
16. 16.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
17. 17.💪 A box weighs 150 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
18. 18.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
19. 19.True or false: your forearm is a class 1 lever (fulcrum in the middle). (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a wheelchair ramp (c) a crane hook block (d) a window blind cord
21. 21.Which of these is a pulley? (a) a door stopper (b) a truck loading ramp (c) a flagpole rope wheel (d) a well winch handle
22. 22.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True
23. 23.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
24. 24.True or false: a screw jack is a screw. (a) False (b) True
25. 25.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) distance from fulcrum (d) mass of fulcrum
26. 26.⚙️ A wedge is … (a) a rope on a wheel (b) a bar on a pivot (c) two ramps back to back (d) a wheel on a rod
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 60 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
28. 28.⚖️ A seesaw balances. Meena (540 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
30. 30.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) powder on a carrom board (d) a grippy rubber sole
33. 33.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) gravity (c) muscular force (d) friction
34. 34.💪 A cart is pulled to the right with 40 N and to the left with 45 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, sandpaper 15 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
37. 37.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the load (c) the fulcrum (d) the effort
38. 38.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a sharp wedge (d) a loose rope
39. 39.⚙️ Which simple machine is a wheelchair ramp? (a) lever (b) wheel and axle (c) inclined plane (d) wedge
40. 40.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 3 (d) 6

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