Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 238 · 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: chalk on a gym bar gives more friction. (a) True (b) False
2. 2.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
3. 3.🏋️ A force of 100 N did 100 J of work. How many metres did the object move?
4. 4.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
5. 5.True or false: a flagpole rope wheel is a pulley. (a) True (b) False
6. 6.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
7. 7.Which of these is caused by friction? (a) a river flows downhill (b) shoes grip the floor (c) lifting a school bag (d) a fridge magnet sticks
8. 8.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
9. 9.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
10. 10.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
11. 11.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
12. 12.⚖️ A lever bar balances. The load is 50 N at ? cm from the fulcrum. The effort is 30 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 90 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
14. 14.True or false: a fixed pulley stays in one place. (a) False (b) True
15. 15.🪝 A load of 60 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
16. 16.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
17. 17.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) True (b) False
18. 18.True or false: a grippy rubber sole gives less friction. (a) True (b) False
19. 19.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
20. 20.🪝 A bucket weighing 140 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.💪 Two children push a box to the right, one with 15 N and the other with 100 N. What is the net (total) force on the box, in newtons?
22. 22.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
24. 24.Which of these is a lever? (a) a knife edge (b) a claw hammer on a nail (c) a wood screw (d) a chisel
25. 25.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
26. 26.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
27. 27.💪 Two children push a box to the right, one with 60 N and the other with 80 N. What is the net (total) force on the box, in newtons?
28. 28.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
30. 30.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
31. 31.True or false: a tug of war is a pull. (a) False (b) True
32. 32.True or false: pushing a trolley is a push. (a) False (b) True
33. 33.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
34. 34.💪 In a tug of war, one team pulls right with 25 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
35. 35.💪 Two children push a box to the right, one with 40 N and the other with 95 N. What is the net (total) force on the box, in newtons?
36. 36.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Arjun (380 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.True or false: drawing up a well bucket is a push. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) skating on ice (d) a box pushed on carpet
39. 39.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 280 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts

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