Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 268 · 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.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a wheel on a rod (d) a rope on a wheel
2. 2.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) gravity (c) friction (d) muscular force
3. 3.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Asha (360 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
5. 5.🏋️ A force of 260 N did 260 J of work. How many metres did the object move?
6. 6.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
7. 7.True or false: a water tap handle is a pulley. (a) False (b) True
8. 8.💪 A cart is pulled to the right with 85 N and to the left with 95 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
9. 9.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) load + effort (d) effort ÷ load
10. 10.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
11. 11.Which of these is a wheel and axle? (a) a seesaw (b) a nutcracker (c) a wheelchair ramp (d) a steering wheel
12. 12.🪝 A bucket weighing 90 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
13. 13.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
15. 15.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a kind of wheel (d) a ramp wrapped round
16. 16.True or false: sand on a slippery path gives more friction. (a) False (b) True
17. 17.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
18. 18.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
20. 20.Which of these is an inclined plane? (a) a jar lid (b) a round doorknob (c) a truck loading ramp (d) an axe blade
21. 21.⚖️ A lever bar balances. The load is 250 N at ? cm from the fulcrum. The effort is 150 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.True or false: a movable pulley is on a flagpole top. (a) True (b) False
23. 23.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
25. 25.True or false: powder on a carrom board gives more friction. (a) True (b) False
26. 26.🏋️ A force of 10 N did 60 J of work. How many metres did the object move?
27. 27.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
29. 29.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
30. 30.💪 In a tug of war, one team pulls right with 90 N and the other pulls left with 65 N. What is the size of the net force, in newtons?
31. 31.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 2 (c) class 3
32. 32.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
34. 34.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
35. 35.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 12 (d) 3
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
37. 37.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 80 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Arjun (160 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.🏋️ A force of 380 N did 3800 J of work. How many metres did the object move?
40. 40.💪 Is a tug of war a push or a pull? (a) a pull (b) a push

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