Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 162 · 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 class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 11 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
3. 3.Which of these is a pulley? (a) a playground slide (b) a door stopper (c) a flagpole rope wheel (d) a knife edge
4. 4.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 3 (c) class 2
5. 5.True or false: a movable pulley halves the effort. (a) True (b) False
6. 6.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 120 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a ramp wrapped round (d) a kind of wheel
8. 8.True or false: a fixed pulley needs effort = load. (a) True (b) False
9. 9.💪 In a tug of war, one team pulls left with 90 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
10. 10.🏋️ Pushing a crate 3 m took 1320 J of work. What force was used, in newtons?
11. 11.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
12. 12.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 150 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
15. 15.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a well winch handle (c) a window blind cord (d) a flagpole rope wheel
16. 16.Which of these is caused by friction? (a) rain falls to the ground (b) an apple falls down (c) rubbing hands warms them (d) a fridge magnet sticks
17. 17.⚖️ A seesaw balances. Kabir (600 N) sits 3 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) far from the fulcrum (c) on the rock (d) near the fulcrum
19. 19.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) oil on a squeaky hinge (d) a box pushed on carpet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
22. 22.🏋️ A force of 140 N pushes a cart 3 m along the floor. How much work is done, in joules?
23. 23.💪 A cart is pulled to the right with 35 N and to the left with 50 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
25. 25.True or false: a movable pulley only changes direction. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) a seesaw (b) a chisel (c) a crowbar (d) a bottle opener
27. 27.⚖️ What is the pivot point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a tyre with deep treads (d) sand on a slippery path
29. 29.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) the bar is short (d) both weights are equal
30. 30.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
31. 31.True or false: a bottle cap is a screw. (a) False (b) True
32. 32.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
33. 33.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
34. 34.Which of these is a wheel and axle? (a) a bottle opener (b) the tip of a nail (c) a round doorknob (d) a flagpole rope wheel
35. 35.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
36. 36.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
37. 37.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 360 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
39. 39.⚙️ Which simple machine is a crane hook block? (a) screw (b) wheel and axle (c) inclined plane (d) pulley
40. 40.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2

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