Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 211 · 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.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
2. 2.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
3. 3.True or false: a jar lid is a screw. (a) False (b) True
4. 4.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
5. 5.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) make new energy (d) use a smaller force
6. 6.🏋️ Pushing a crate 9 m took 3240 J of work. What force was used, in newtons?
7. 7.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, by half (d) yes, always
8. 8.⚖️ A lever bar balances. The load is 240 N at 30 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
10. 10.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Asha (600 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
12. 12.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 300 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 240 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.⚙️ Which simple machine is an axe blade? (a) wheel and axle (b) lever (c) pulley (d) wedge
15. 15.Which of these is an inclined plane? (a) a well winch handle (b) a claw hammer on a nail (c) a chisel (d) a wheelchair ramp
16. 16.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.⚙️ Which simple machine is a round doorknob? (a) screw (b) wedge (c) inclined plane (d) wheel and axle
18. 18.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 1 (c) class 2
19. 19.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a playground slide (c) a road up a hill (d) a screw jack
20. 20.True or false: a well-bucket rope wheel is an inclined plane. (a) False (b) True
21. 21.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
22. 22.True or false: a tyre with deep treads gives more friction. (a) True (b) False
23. 23.⚖️ A seesaw balances. Meena (300 N) sits ? m from the pivot on one side; Ravi (600 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
24. 24.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
25. 25.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) two ramps back to back (d) a bar on a pivot
26. 26.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
28. 28.💪 A box weighs 430 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
29. 29.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
30. 30.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
31. 31.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
32. 32.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
33. 33.💪 Two children push a box to the right, one with 25 N and the other with 10 N. What is the net (total) force on the box, in newtons?
34. 34.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
35. 35.True or false: closing a drawer is a pull. (a) False (b) True
36. 36.⚖️ A lever bar balances. The load is 60 N at 20 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.⚖️ What is the pivot point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
38. 38.⚖️ A seesaw balances. Arjun (360 N) sits 1 m from the pivot on one side; Kabir (120 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
39. 39.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
40. 40.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the load (d) the fulcrum

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