Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 220 · 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 machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?
2. 2.💪 A box weighs 150 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
3. 3.💪 A bag has a mass of 8 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
4. 4.⚖️ A seesaw balances. Kabir (130 N) sits 4 m from the pivot on one side; Zoya (520 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
5. 5.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) skating on ice (d) powder on a carrom board
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
8. 8.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
9. 9.💪 Which can a force NOT do? (a) change its shape (b) change its colour (c) start it moving (d) stop it moving
10. 10.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 12 (d) 10
11. 11.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
12. 12.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
13. 13.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.🏋️ A force of 500 N did 1500 J of work. How many metres did the object move?
16. 16.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
17. 17.🏋️ A force of 320 N did 1920 J of work. How many metres did the object move?
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
19. 19.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a bar on a pivot (d) a rope on a wheel
20. 20.💪 A cart is pulled to the right with 60 N and to the left with 50 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
21. 21.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a knife edge (c) a window blind cord (d) a well-bucket rope wheel
23. 23.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
24. 24.🏋️ A 10 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
25. 25.True or false: kicking a football is a push. (a) True (b) False
26. 26.🏋️ 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
27. 27.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
28. 28.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) the tip of a nail (c) a crowbar (d) a seesaw
29. 29.⚙️ 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
30. 30.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
31. 31.⚙️ Which simple machine is a window blind cord? (a) inclined plane (b) pulley (c) wheel and axle (d) wedge
32. 32.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
33. 33.True or false: skating on ice gives more friction. (a) True (b) False
34. 34.🪝 A load of 200 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
35. 35.⚖️ A seesaw balances. Asha (600 N) sits ? m from the pivot on one side; Meena (200 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
36. 36.True or false: a tug of war is a pull. (a) True (b) False
37. 37.⚙️ Which simple machine is a round doorknob? (a) lever (b) wedge (c) wheel and axle (d) inclined plane
38. 38.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 1 (c) class 2
40. 40.Which of these is a wheel and axle? (a) an axe blade (b) a well-bucket rope wheel (c) a crane hook block (d) a steering wheel

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