Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 420 · 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.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
2. 2.True or false: kicking a football is a pull. (a) False (b) True
3. 3.⚖️ A seesaw balances. Zoya (130 N) sits 2 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
5. 5.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
9. 9.🏋️ A force of 480 N did 2400 J of work. How many metres did the object move?
10. 10.🏋️ A force of 300 N pushes a cart 10 m along the floor. How much work is done, in joules?
11. 11.💪 In a tug of war, one team pulls left with 20 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
12. 12.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) both weights are equal (d) turning effects match
13. 13.💪 Which force is at work: rubbing hands warms them? (a) gravity (b) magnetic force (c) muscular force (d) friction
14. 14.Which of these is a wedge? (a) a bottle opener (b) a well-bucket rope wheel (c) the tip of a nail (d) a wood screw
15. 15.🏋️ A force of 60 N pushes a cart 10 m along the floor. How much work is done, in joules?
16. 16.💪 Two children push a box to the right, one with 80 N and the other with 35 N. What is the net (total) force on the box, in newtons?
17. 17.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
19. 19.⚖️ A seesaw balances. Ravi (680 N) sits 1 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.True or false: a crowbar is an inclined plane. (a) False (b) True
21. 21.💪 A box weighs 230 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
22. 22.⚙️ Which simple machine is a well winch handle? (a) wheel and axle (b) pulley (c) lever (d) screw
23. 23.💪 A box weighs 300 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
24. 24.Which of these is a lever? (a) a road up a hill (b) a nut and bolt (c) a claw hammer on a nail (d) the tip of a nail
25. 25.🏋️ A force of 410 N did 1640 J of work. How many metres did the object move?
26. 26.⚖️ A seesaw balances. Ravi (130 N) sits 4 m from the pivot on one side; Arjun (520 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
28. 28.🏋️ 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)
29. 29.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
30. 30.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
31. 31.🏋️ A force of 280 N pushes a cart 1 m along the floor. How much work is done, in joules?
32. 32.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
33. 33.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) second (s) (d) newton (N)
34. 34.🛞 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 4 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
35. 35.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a loose rope (d) a smaller rod (axle)
36. 36.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
38. 38.Which of these is caused by friction? (a) lifting a school bag (b) a river flows downhill (c) brakes stop a bicycle (d) a compass needle turns
39. 39.True or false: sand on a slippery path gives less friction. (a) True (b) False
40. 40.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot

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