Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 448 · 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 lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 500 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a loose rope (d) a sharp wedge
3. 3.💪 A cart is pulled to the right with 25 N and to the left with 35 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
4. 4.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 3 (c) class 1
5. 5.🔍 Which is the odd one out? (a) a steering wheel (b) a water tap handle (c) a round doorknob (d) a wheelchair ramp
6. 6.🏋️ A force of 490 N did 980 J of work. How many metres did the object move?
7. 7.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
8. 8.Which of these is caused by muscular force? (a) squeezing a lemon (b) an apple falls down (c) a river flows downhill (d) a compass needle turns
9. 9.True or false: closing a drawer is a push. (a) True (b) False
10. 10.⚖️ A seesaw balances. Kabir (220 N) sits 1 m from the pivot on one side; Ravi (110 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
11. 11.🏋️ Pushing a crate 4 m took 1520 J of work. What force was used, in newtons?
12. 12.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
13. 13.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
14. 14.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 3 (c) class 2
15. 15.💪 Two children push a box to the right, one with 60 N and the other with 15 N. What is the net (total) force on the box, in newtons?
16. 16.True or false: sand on a slippery path gives less friction. (a) False (b) True
17. 17.🪝 A pulley system lifts a 600 N load with an effort of 300 N. What is its mechanical advantage (MA)?
18. 18.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 3 (d) 10
19. 19.True or false: a movable pulley only changes direction. (a) False (b) True
20. 20.💪 In a tug of war, one team pulls right with 60 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
22. 22.⚖️ 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 3 (c) class 2
23. 23.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
24. 24.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
25. 25.⚖️ A lever bar balances. The load is 480 N at 20 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
27. 27.True or false: chalk on a gym bar gives more friction. (a) True (b) False
28. 28.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) magnetic force (c) friction (d) gravity
29. 29.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) magnetic force (c) gravity (d) friction
30. 30.Which of these is caused by magnetic force? (a) brakes stop a bicycle (b) a fridge magnet sticks (c) a river flows downhill (d) rain falls to the ground
31. 31.⚙️ 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
32. 32.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
33. 33.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
35. 35.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
37. 37.True or false: a smooth steel slide gives more friction. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) a bottle cap (b) a knife edge (c) a nut and bolt (d) a wood screw
39. 39.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
40. 40.🪝 A bucket weighing 320 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)

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