Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 295 · 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.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
2. 2.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
3. 3.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a tyre with deep treads (d) powder on a carrom board
4. 4.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
5. 5.🏋️ A force of 220 N pushes a cart 5 m along the floor. How much work is done, in joules?
6. 6.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.Which of these is a lever? (a) a jar lid (b) a seesaw (c) a well winch handle (d) a knife edge
8. 8.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
9. 9.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
10. 10.⚖️ A lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 60 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.⚖️ A seesaw balances. Asha (480 N) sits 1 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.🏋️ Pushing a crate 4 m took 280 J of work. What force was used, in newtons?
13. 13.⚖️ A seesaw balances. Kabir (760 N) sits 1 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
15. 15.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
16. 16.🪝 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)
17. 17.🔍 Which is the odd one out? (a) a crane hook block (b) a well-bucket rope wheel (c) a window blind cord (d) the tip of a nail
18. 18.Which of these is a wedge? (a) a playground slide (b) a chisel (c) a wood screw (d) a crowbar
19. 19.💪 A cart is pulled to the right with 35 N and to the left with 40 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
21. 21.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 10 (d) 12
22. 22.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
23. 23.💪 In a tug of war, one team pulls right with 100 N and the other pulls left with 90 N. What is the size of the net force, in newtons?
24. 24.💪 A bag has a mass of 28 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
25. 25.True or false: pushing a trolley is a pull. (a) True (b) False
26. 26.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
28. 28.⚙️ Which simple machine is a bottle opener? (a) lever (b) screw (c) wedge (d) pulley
29. 29.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
30. 30.🔍 Which is the odd one out? (a) a road up a hill (b) the tip of a nail (c) an axe blade (d) a door stopper
31. 31.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.True or false: pressing a doorbell is a push. (a) True (b) False
33. 33.💪 A cart is pulled to the right with 25 N and to the left with 30 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
34. 34.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
35. 35.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 30 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
37. 37.Which of these is caused by muscular force? (a) pedalling a cycle (b) shoes grip the floor (c) a rolling ball slows (d) an apple falls down
38. 38.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
39. 39.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids