Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 937 · 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 ramp wrapped round (c) a bent lever (d) a kind of wheel
2. 2.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 500 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
4. 4.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
5. 5.⚖️ A lever bar balances. The load is 420 N at ? cm from the fulcrum. The effort is 120 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
8. 8.⚖️ A seesaw balances. Arjun (190 N) sits 4 m from the pivot on one side; Kabir (760 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
9. 9.⚖️ A lever bar balances. The load is 700 N at 40 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?
10. 10.💪 A force is a … (a) push or a pull (b) unit of time (c) type of sound (d) kind of colour
11. 11.True or false: kicking a football is a pull. (a) False (b) True
12. 12.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
15. 15.True or false: a box pushed on carpet gives less friction. (a) False (b) True
16. 16.⚖️ A seesaw balances. Meena (340 N) sits 3 m from the pivot on one side; Zoya (510 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
17. 17.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
18. 18.🏋️ A force of 440 N did 880 J of work. How many metres did the object move?
19. 19.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
20. 20.🏋️ A force of 50 N did 500 J of work. How many metres did the object move?
21. 21.⚙️ Which simple machine is a round doorknob? (a) lever (b) wheel and axle (c) wedge (d) screw
22. 22.🪝 A bucket weighing 500 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
24. 24.True or false: the tip of a nail is a wheel and axle. (a) True (b) False
25. 25.🏋️ Pushing a crate 8 m took 2560 J of work. What force was used, in newtons?
26. 26.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the bar is short (d) the fulcrum moves
27. 27.⚙️ Which simple machine is a crane hook block? (a) pulley (b) wedge (c) lever (d) inclined plane
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
29. 29.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
30. 30.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
31. 31.⚙️ Which simple machine is a truck loading ramp? (a) lever (b) pulley (c) inclined plane (d) screw
32. 32.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
33. 33.💪 A bag has a mass of 56 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
34. 34.Which of these is an inclined plane? (a) a playground slide (b) a bottle cap (c) a flagpole rope wheel (d) a jar lid
35. 35.True or false: chalk on a gym bar gives more friction. (a) False (b) True
36. 36.⚖️ A seesaw balances. Kabir (120 N) sits 1 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) the direction of pull (d) gravity
38. 38.⚙️ Which simple machine is a door stopper? (a) lever (b) pulley (c) inclined plane (d) wedge
39. 39.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
40. 40.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?

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