Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 152 · 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: pressing a doorbell is a pull. (a) False (b) True
2. 2.⚙️ Which simple machine is a round doorknob? (a) inclined plane (b) wheel and axle (c) lever (d) wedge
3. 3.🏋️ Pushing a crate 9 m took 2160 J of work. What force was used, in newtons?
4. 4.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
5. 5.💪 Which force is at work: an apple falls down? (a) magnetic force (b) gravity (c) friction (d) muscular force
6. 6.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
8. 8.🏋️ A force of 70 N pushes a cart 7 m along the floor. How much work is done, in joules?
9. 9.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
10. 10.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) False (b) True
11. 11.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
12. 12.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
13. 13.True or false: a fixed pulley rises with the load. (a) False (b) True
14. 14.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
15. 15.🪝 A pulley system lifts a 440 N load with an effort of 110 N. What is its mechanical advantage (MA)?
16. 16.⚖️ A seesaw balances. Kabir (570 N) sits 3 m from the pivot on one side; Asha (570 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
17. 17.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
18. 18.True or false: a wet tiled floor gives less friction. (a) False (b) True
19. 19.🪝 A load of 750 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
20. 20.💪 A box weighs 280 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
21. 21.⚙️ Which simple machine is a road up a hill? (a) screw (b) wedge (c) lever (d) inclined plane
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
23. 23.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
24. 24.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
25. 25.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a kind of wheel (d) a bent lever
26. 26.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the fulcrum (c) the axle (d) the effort
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
28. 28.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
29. 29.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
31. 31.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
32. 32.⚙️ Which simple machine is a chisel? (a) screw (b) wheel and axle (c) lever (d) wedge
33. 33.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
34. 34.⚖️ What is the pivot point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
35. 35.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
36. 36.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
37. 37.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
38. 38.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) skating on ice (d) a box pushed on carpet
39. 39.True or false: a movable pulley is on a flagpole top. (a) False (b) True
40. 40.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the pulley

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