Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 512 · 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 60 N when you push with 10 N. What is its mechanical advantage (MA)?
2. 2.Which of these is a pulley? (a) a claw hammer on a nail (b) a truck loading ramp (c) a flagpole rope wheel (d) a well winch handle
3. 3.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
4. 4.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a kind of wheel (d) a bent lever
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 80 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
8. 8.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
9. 9.⚙️ Which simple machine is a knife edge? (a) screw (b) inclined plane (c) lever (d) wedge
10. 10.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 10 N. What is the size of the net force, in newtons?
11. 11.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 80 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.⚖️ A seesaw balances. Arjun (180 N) sits 4 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.Which of these is an inclined plane? (a) a screw jack (b) a claw hammer on a nail (c) a crowbar (d) a truck loading ramp
14. 14.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
15. 15.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
16. 16.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) False (b) True
17. 17.Which of these is caused by muscular force? (a) rain falls to the ground (b) a river flows downhill (c) brakes stop a bicycle (d) pedalling a cycle
18. 18.Which of these is caused by gravity? (a) rubbing hands warms them (b) shoes grip the floor (c) a rolling ball slows (d) a thrown ball comes down
19. 19.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the fulcrum (d) the effort
20. 20.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.🏋️ 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
22. 22.💪 Two children push a box to the right, one with 95 N and the other with 80 N. What is the net (total) force on the box, in newtons?
23. 23.True or false: pushing a swing is a pull. (a) True (b) False
24. 24.⚙️ Which simple machine is a crowbar? (a) lever (b) pulley (c) wedge (d) screw
25. 25.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) a round doorknob (b) a water tap handle (c) a steering wheel (d) a crane hook block
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
28. 28.True or false: skating on ice gives less friction. (a) True (b) False
29. 29.⚖️ A lever bar balances. The load is 70 N at ? cm from the fulcrum. The effort is 10 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
31. 31.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Ravi (540 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.🏋️ Pushing a crate 5 m took 1600 J of work. What force was used, in newtons?
33. 33.💪 A cart is pulled to the right with 65 N and to the left with 55 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
34. 34.🏋️ A force of 340 N pushes a cart 3 m along the floor. How much work is done, in joules?
35. 35.⚖️ A seesaw balances. Kabir (330 N) sits 3 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
37. 37.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
38. 38.⚙️ Which simple machine is a steering wheel? (a) wheel and axle (b) wedge (c) pulley (d) lever
39. 39.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
40. 40.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley

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