Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 939 · 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 screw is really … (a) a tiny pulley (b) a bent lever (c) a ramp wrapped round (d) a kind of wheel
2. 2.🏋️ A force of 150 N pushes a cart 3 m along the floor. How much work is done, in joules?
3. 3.🏋️ Pushing a crate 7 m took 210 J of work. What force was used, in newtons?
4. 4.💪 Which force is at work: a thrown ball comes down? (a) gravity (b) friction (c) muscular force (d) magnetic force
5. 5.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 10 (c) 3 (d) 12
6. 6.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
7. 7.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
8. 8.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
9. 9.⚙️ Which simple machine is a steering wheel? (a) pulley (b) wheel and axle (c) wedge (d) screw
10. 10.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
11. 11.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
12. 12.⚖️ A lever bar balances. The load is 450 N at 20 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?
13. 13.True or false: pressing a doorbell is a push. (a) True (b) False
14. 14.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) closer to the pivot (d) farther from the pivot
15. 15.🔍 Which is the odd one out? (a) a seesaw (b) a wood screw (c) a crowbar (d) a nutcracker
16. 16.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
17. 17.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
18. 18.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
20. 20.⚖️ A seesaw balances. Meena (390 N) sits ? m from the pivot on one side; Zoya (130 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
21. 21.True or false: sand on a slippery path gives more friction. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a playground slide (b) a wheelchair ramp (c) a road up a hill (d) a claw hammer on a nail
23. 23.⚖️ A lever bar balances. The load is 720 N at 50 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
25. 25.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
26. 26.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
27. 27.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
28. 28.💪 In a tug of war, one team pulls left with 20 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
29. 29.💪 In which unit do we measure force? (a) metre (m) (b) second (s) (c) newton (N) (d) litre (L)
30. 30.⚖️ A lever bar balances. The load is 210 N at 40 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.💪 Two children push a box to the right, one with 5 N and the other with 55 N. What is the net (total) force on the box, in newtons?
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
33. 33.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 90 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
35. 35.⚙️ 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
36. 36.Which of these is a wheel and axle? (a) a wood screw (b) a window blind cord (c) a steering wheel (d) a crowbar
37. 37.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) colour of bar (d) mass of fulcrum
38. 38.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
39. 39.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
40. 40.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction

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