Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 168 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
2. 2.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
3. 3.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
4. 4.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
5. 5.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
6. 6.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
7. 7.⚖️ A seesaw balances. Meena (120 N) sits ? m from the pivot on one side; Zoya (240 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
8. 8.True or false: a movable pulley is on a flagpole top. (a) False (b) True
9. 9.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
10. 10.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Asha (150 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) skating on ice (d) oil on a squeaky hinge
12. 12.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
13. 13.True or false: hitting a cricket ball is a push. (a) True (b) False
14. 14.💪 Two children push a box to the right, one with 65 N and the other with 60 N. What is the net (total) force on the box, in newtons?
15. 15.Which of these is caused by magnetic force? (a) an apple falls down (b) rubbing hands warms them (c) a compass needle turns (d) lifting a school bag
16. 16.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
17. 17.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 2 (c) class 1
18. 18.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a flagpole rope wheel (c) a crane hook block (d) a chisel
19. 19.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
21. 21.True or false: a movable pulley only changes direction. (a) False (b) True
22. 22.⚖️ A seesaw balances. Meena (200 N) sits ? m from the pivot on one side; Kabir (800 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
24. 24.💪 A force is a … (a) type of sound (b) push or a pull (c) kind of colour (d) unit of time
25. 25.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
26. 26.⚖️ A lever bar balances. The load is 100 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?
27. 27.💪 Two children push a box to the right, one with 85 N and the other with 30 N. What is the net (total) force on the box, in newtons?
28. 28.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
29. 29.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
30. 30.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Ravi (440 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.True or false: a rough doormat gives less friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
33. 33.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) False (b) True
34. 34.🪝 A bucket weighing 410 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) use a smaller force (d) switch off gravity
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a box pushed on carpet (d) oil on a squeaky hinge
37. 37.True or false: a jar lid is a wedge. (a) True (b) False
38. 38.True or false: a fixed pulley rises with the load. (a) False (b) True
39. 39.⚙️ Which simple machine is a bottle cap? (a) wheel and axle (b) lever (c) wedge (d) screw
40. 40.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it

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