Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 392 · 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 (720 N) sits 1 m from the pivot on one side; Arjun (180 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
2. 2.🏋️ A force of 310 N pushes a cart 10 m along the floor. How much work is done, in joules?
3. 3.⚖️ A seesaw balances. Meena (400 N) sits ? m from the pivot on one side; Asha (400 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
4. 4.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 3 (c) class 1
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 90 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
6. 6.Which of these is a pulley? (a) a truck loading ramp (b) an axe blade (c) a knife edge (d) a window blind cord
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
9. 9.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
10. 10.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) a bar on a pivot (d) two ramps back to back
11. 11.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
12. 12.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
13. 13.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.⚙️ Which simple machine is a bottle opener? (a) inclined plane (b) wedge (c) lever (d) screw
15. 15.🪝 A bucket weighing 440 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.⚖️ What is the pivot point of a lever called? (a) the axle (b) the effort (c) the fulcrum (d) the load
17. 17.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Ravi (220 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)
19. 19.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 13 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
21. 21.🪝 A pulley system lifts a 320 N load with an effort of 80 N. What is its mechanical advantage (MA)?
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 90 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
23. 23.💪 Two children push a box to the right, one with 45 N and the other with 15 N. What is the net (total) force on the box, in newtons?
24. 24.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
25. 25.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the colour of rope (d) the size of the load
26. 26.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
27. 27.⚖️ Which class of lever is your forearm? (a) class 3 (b) class 1 (c) class 2
28. 28.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
29. 29.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the fulcrum (c) the effort (d) nothing
30. 30.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
31. 31.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a bent lever (d) a ramp wrapped round
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) sand on a slippery path (d) a tyre with deep treads
33. 33.Which of these is an inclined plane? (a) a flagpole rope wheel (b) a crowbar (c) a road up a hill (d) a round doorknob
34. 34.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
36. 36.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 12 (d) 6
37. 37.🏋️ A force of 490 N did 3430 J of work. How many metres did the object move?
38. 38.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
39. 39.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) balanced (c) doubled (d) gravity

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