Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 924 · 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.Which of these is a wheel and axle? (a) a door stopper (b) a jar lid (c) a well winch handle (d) a road up a hill
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 10 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
3. 3.🪝 A load of 400 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
4. 4.⚖️ A seesaw balances. Meena (340 N) sits 4 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.🏋️ A force of 310 N did 1240 J of work. How many metres did the object move?
6. 6.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the fulcrum (d) the load
7. 7.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
8. 8.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
9. 9.True or false: a movable pulley only changes direction. (a) False (b) True
10. 10.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 40 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.⚖️ A lever bar balances. The load is 20 N at 10 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.⚖️ A lever bar balances. The load is 400 N at 30 cm from the fulcrum. The effort is 300 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.⚖️ A seesaw balances. Arjun (400 N) sits 2 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
15. 15.🏋️ A force of 220 N pushes a cart 1 m along the floor. How much work is done, in joules?
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
17. 17.True or false: opening a drawer is a pull. (a) False (b) True
18. 18.⚖️ A lever bar balances. The load is 160 N at 20 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
20. 20.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
21. 21.🪝 A load of 520 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
22. 22.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
24. 24.🪝 A load of 720 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
25. 25.Which of these is a wheel and axle? (a) a jar lid (b) a window blind cord (c) a door stopper (d) a water tap handle
26. 26.🪝 A bucket weighing 150 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a grippy rubber sole (d) chalk on a gym bar
28. 28.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
29. 29.💪 Two children push a box to the right, one with 35 N and the other with 55 N. What is the net (total) force on the box, in newtons?
30. 30.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
31. 31.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 55 N. What is the size of the net force, in newtons?
32. 32.💪 Two children push a box to the right, one with 20 N and the other with 40 N. What is the net (total) force on the box, in newtons?
33. 33.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
34. 34.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
35. 35.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
36. 36.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
37. 37.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Kabir (240 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🏋️ Pushing a crate 9 m took 2250 J of work. What force was used, in newtons?
39. 39.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.🛞 More or less friction: skating on ice? (a) more friction (b) less friction

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