Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 908 · 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: oil on a squeaky hinge gives more friction. (a) True (b) False
2. 2.🏋️ Pushing a crate 6 m took 2940 J of work. What force was used, in newtons?
3. 3.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) switch off gravity (d) make new energy
4. 4.True or false: a crowbar is a lever. (a) True (b) False
5. 5.True or false: opening a drawer is a pull. (a) False (b) True
6. 6.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Ravi (480 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.💪 Which can a force NOT do? (a) change its shape (b) change its colour (c) stop it moving (d) start it moving
8. 8.💪 Two children push a box to the right, one with 20 N and the other with 15 N. What is the net (total) force on the box, in newtons?
9. 9.Which of these is a wheel and axle? (a) a well winch handle (b) a window blind cord (c) a crane hook block (d) a door stopper
10. 10.Which of these is an inclined plane? (a) a window blind cord (b) a wheelchair ramp (c) a jar lid (d) a round doorknob
11. 11.⚖️ 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?
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
13. 13.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
14. 14.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
15. 15.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
16. 16.⚖️ A lever bar balances. The load is 360 N at 40 cm from the fulcrum. The effort is 360 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1
18. 18.🪝 A load of 600 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
20. 20.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.⚖️ 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
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
23. 23.💪 Which force is at work: a river flows downhill? (a) friction (b) muscular force (c) gravity (d) magnetic force
24. 24.🪝 A bucket weighing 290 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
25. 25.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Kabir (320 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.⚙️ A screw is really … (a) a ramp wrapped round (b) a kind of wheel (c) a tiny pulley (d) a bent lever
27. 27.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
28. 28.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 80 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.⚖️ A lever bar balances. The load is 120 N at 40 cm from the fulcrum. The effort is 240 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
31. 31.⚖️ A lever bar balances. The load is 540 N at 30 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) True (b) False
33. 33.🏋️ A force of 440 N pushes a cart 2 m along the floor. How much work is done, in joules?
34. 34.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a rough doormat (d) skating on ice
35. 35.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
36. 36.🔍 Which is the odd one out? (a) a water tap handle (b) a steering wheel (c) a nut and bolt (d) a round doorknob
37. 37.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
38. 38.⚙️ Which simple machine is a knife edge? (a) inclined plane (b) wedge (c) screw (d) lever
39. 39.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
40. 40.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull

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