Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 543 · 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.True or false: a movable pulley stays in one place. (a) True (b) False
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
3. 3.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 270 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its shape (d) change its colour
5. 5.💪 Which force is at work: pedalling a cycle? (a) gravity (b) muscular force (c) magnetic force (d) friction
6. 6.True or false: a grippy rubber sole gives more friction. (a) True (b) False
7. 7.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) friction (c) gravity (d) magnetic force
8. 8.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 6 (c) 12 (d) 10
9. 9.💪 In a tug of war, one team pulls right with 80 N and the other pulls left with 75 N. What is the size of the net force, in newtons?
10. 10.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 3300 N box up it, in newtons? (ideal ramp, no friction)
11. 11.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
12. 12.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a wet tiled floor (d) a box pushed on carpet
13. 13.🔍 Which is the odd one out? (a) a bottle cap (b) a door stopper (c) a screw jack (d) a jar lid
14. 14.⚖️ A lever bar balances. The load is 300 N at 10 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.🏋️ A force of 380 N pushes a cart 2 m along the floor. How much work is done, in joules?
16. 16.🪝 A pulley system lifts a 1200 N load with an effort of 300 N. What is its mechanical advantage (MA)?
17. 17.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
18. 18.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
19. 19.True or false: chalk on a gym bar gives more friction. (a) False (b) True
20. 20.🏋️ Pushing a crate 9 m took 2700 J of work. What force was used, in newtons?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
22. 22.⚖️ What is the pivot point of a lever called? (a) the load (b) the effort (c) the axle (d) the fulcrum
23. 23.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
24. 24.🔍 Which is the odd one out? (a) a well winch handle (b) a crane hook block (c) a round doorknob (d) a water tap handle
25. 25.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
26. 26.⚖️ A lever bar balances. The load is 300 N at 50 cm from the fulcrum. The effort is 150 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
28. 28.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a smooth steel slide
29. 29.💪 In a tug of war, one team pulls right with 75 N and the other pulls left with 50 N. What is the size of the net force, in newtons?
30. 30.True or false: a movable pulley rises with the load. (a) False (b) True
31. 31.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
32. 32.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
33. 33.🏋️ Pushing a crate 5 m took 1350 J of work. What force was used, in newtons?
34. 34.💪 Which force is at work: shoes grip the floor? (a) muscular force (b) gravity (c) magnetic force (d) friction
35. 35.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
36. 36.⚖️ A lever bar balances. The load is 300 N at 30 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.⚖️ A seesaw balances. Meena (100 N) sits ? m from the pivot on one side; Arjun (400 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
38. 38.⚖️ A seesaw balances. Meena (380 N) sits 3 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
40. 40.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a loose rope (d) a smaller rod (axle)

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