Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 620 · 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 seesaw balances. Ravi (380 N) sits 1 m from the pivot on one side; Meena (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
2. 2.True or false: a bottle cap is a wedge. (a) True (b) False
3. 3.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
4. 4.⚖️ A lever bar balances. The load is 500 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
6. 6.True or false: a crowbar is a lever. (a) True (b) False
7. 7.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a flat ramp (d) a loose rope
8. 8.⚖️ A seesaw balances. Meena (390 N) sits 4 m from the pivot on one side; Kabir (520 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
9. 9.True or false: a pair of kitchen tongs is a class 2 lever (load in the middle). (a) False (b) True
10. 10.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
11. 11.🔍 Which is the odd one out? (a) a crane hook block (b) a well-bucket rope wheel (c) a round doorknob (d) a window blind cord
12. 12.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
13. 13.🏋️ A force of 480 N did 3840 J of work. How many metres did the object move?
14. 14.True or false: kicking a football is a pull. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
17. 17.⚖️ A seesaw balances. Arjun (390 N) sits 4 m from the pivot on one side; Asha (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 3 (c) class 1
19. 19.🏋️ A force of 20 N pushes a cart 6 m along the floor. How much work is done, in joules?
20. 20.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
21. 21.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
22. 22.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
23. 23.⚖️ A seesaw balances. Asha (480 N) sits 2 m from the pivot on one side; Kabir (320 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the load (d) the fulcrum
25. 25.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
27. 27.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
28. 28.True or false: pressing a doorbell is a push. (a) True (b) False
29. 29.⚖️ A seesaw balances. Meena (170 N) sits ? m from the pivot on one side; Asha (680 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
30. 30.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
31. 31.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.True or false: a tug of war is a pull. (a) True (b) False
33. 33.⚙️ Which simple machine is a well winch handle? (a) pulley (b) inclined plane (c) wheel and axle (d) lever
34. 34.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
35. 35.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
36. 36.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
37. 37.True or false: plucking a mango is a push. (a) False (b) True
38. 38.🏋️ A force of 350 N did 1050 J of work. How many metres did the object move?
39. 39.💪 In a tug of war, one team pulls left with 30 N and the other pulls right with 10 N. What is the size of the net force, in newtons?
40. 40.Which of these is a screw? (a) a well winch handle (b) a flagpole rope wheel (c) a bottle cap (d) a nutcracker

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