Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 673 · 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.💪 Which force is at work: a river flows downhill? (a) muscular force (b) friction (c) gravity (d) magnetic force
2. 2.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a wheel on ball bearings (d) powder on a carrom board
3. 3.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 350 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
7. 7.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2600 N box up it, in newtons? (ideal ramp, no friction)
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
9. 9.True or false: a road up a hill is an inclined plane. (a) True (b) False
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
11. 11.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) gravity (d) magnetism
12. 12.💪 Two children push a box to the right, one with 70 N and the other with 40 N. What is the net (total) force on the box, in newtons?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
14. 14.🏋️ A force of 170 N did 1190 J of work. How many metres did the object move?
15. 15.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
16. 16.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
17. 17.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
20. 20.⚖️ A lever bar balances. The load is 400 N at 50 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.💪 A bag has a mass of 2 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
23. 23.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Asha (390 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.💪 In a tug of war, one team pulls right with 30 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
25. 25.🏋️ A force of 200 N did 800 J of work. How many metres did the object move?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
27. 27.🔍 Which is the odd one out? (a) the tip of a nail (b) a flagpole rope wheel (c) a window blind cord (d) a crane hook block
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
29. 29.⚙️ Which simple machine is a door stopper? (a) wedge (b) inclined plane (c) pulley (d) lever
30. 30.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
31. 31.True or false: pulling a cart is a pull. (a) False (b) True
32. 32.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
33. 33.⚖️ A lever bar balances. The load is 210 N at 40 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 1 (c) class 3
35. 35.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 2 (c) class 3
36. 36.💪 Which can a force NOT do? (a) change its colour (b) start it moving (c) stop it moving (d) change its shape
37. 37.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
38. 38.True or false: a fixed pulley stays in one place. (a) True (b) False
39. 39.🏋️ A force of 470 N pushes a cart 1 m along the floor. How much work is done, in joules?
40. 40.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) colour of bar (d) mass of fulcrum

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