Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 898 · 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.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the axle (c) the fulcrum (d) the effort
2. 2.Which of these is caused by magnetic force? (a) rain falls to the ground (b) a fridge magnet sticks (c) rubbing hands warms them (d) pedalling a cycle
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a box pushed on carpet (d) chalk on a gym bar
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
5. 5.True or false: plucking a mango is a push. (a) True (b) False
6. 6.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
7. 7.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
8. 8.Which of these is caused by gravity? (a) a fridge magnet sticks (b) brakes stop a bicycle (c) rain falls to the ground (d) a rolling ball slows
9. 9.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
10. 10.True or false: a crane hook block is a screw. (a) True (b) False
11. 11.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a bent lever (d) a kind of wheel
12. 12.⚖️ A seesaw balances. Ravi (760 N) sits ? m from the pivot on one side; Kabir (190 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
13. 13.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
14. 14.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
16. 16.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
17. 17.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
18. 18.🔍 Which is the odd one out? (a) a road up a hill (b) a well-bucket rope wheel (c) a playground slide (d) a wheelchair ramp
19. 19.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.💪 Which force is at work: an apple falls down? (a) friction (b) muscular force (c) magnetic force (d) gravity
21. 21.⚖️ A seesaw balances. Arjun (540 N) sits 3 m from the pivot on one side; Asha (540 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
22. 22.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
23. 23.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) time taken (d) distance from fulcrum
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
26. 26.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
27. 27.⚖️ A seesaw balances. Zoya (680 N) sits ? m from the pivot on one side; Meena (680 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
28. 28.💪 Which can a force NOT do? (a) change its colour (b) change its shape (c) start it moving (d) stop it moving
29. 29.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
30. 30.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
31. 31.💪 In a tug of war, one team pulls left with 35 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
32. 32.⚖️ A seesaw balances. Asha (180 N) sits ? m from the pivot on one side; Kabir (540 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
33. 33.🏋️ A force of 250 N did 1000 J of work. How many metres did the object move?
34. 34.🏋️ A force of 350 N pushes a cart 2 m along the floor. How much work is done, in joules?
35. 35.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) gravity (c) muscular force (d) friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
37. 37.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
38. 38.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 magnet picks up pins
39. 39.Which of these is a wheel and axle? (a) a truck loading ramp (b) a nutcracker (c) a water tap handle (d) a wheelchair ramp
40. 40.True or false: the tip of a nail is an inclined plane. (a) True (b) False

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