Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 904 · 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.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a smooth steel slide (d) a box pushed on carpet
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) skating on ice (d) a box pushed on carpet
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
6. 6.Which of these is a wedge? (a) a nut and bolt (b) an axe blade (c) a nutcracker (d) a bottle cap
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
8. 8.Which of these is caused by magnetic force? (a) a thrown ball comes down (b) a rolling ball slows (c) shoes grip the floor (d) a fridge magnet sticks
9. 9.🔍 Which is the odd one out? (a) the tip of a nail (b) a door stopper (c) a nut and bolt (d) a chisel
10. 10.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
11. 11.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
13. 13.💪 Which force is at work: rain falls to the ground? (a) gravity (b) friction (c) muscular force (d) magnetic force
14. 14.🏋️ A force of 410 N did 3690 J of work. How many metres did the object move?
15. 15.⚙️ Which simple machine is a door stopper? (a) wedge (b) pulley (c) lever (d) inclined plane
16. 16.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
17. 17.Which of these is caused by friction? (a) a rolling ball slows (b) pedalling a cycle (c) rain falls to the ground (d) a fridge magnet sticks
18. 18.💪 Two children push a box to the right, one with 55 N and the other with 35 N. What is the net (total) force on the box, in newtons?
19. 19.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
20. 20.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 50 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.⚖️ A lever bar balances. The load is 720 N at ? cm from the fulcrum. The effort is 240 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.💪 A box weighs 510 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
23. 23.True or false: a tyre with deep treads gives more friction. (a) True (b) False
24. 24.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
25. 25.🏋️ Pushing a crate 3 m took 930 J of work. What force was used, in newtons?
26. 26.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
27. 27.💪 A cart is pulled to the right with 85 N and to the left with 100 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 6 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
30. 30.🔍 Which is the odd one out? (a) a knife edge (b) a wood screw (c) a bottle cap (d) a screw jack
31. 31.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
32. 32.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a smooth steel slide (d) skating on ice
33. 33.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
34. 34.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
35. 35.🏋️ A force of 140 N pushes a cart 4 m along the floor. How much work is done, in joules?
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
37. 37.True or false: sand on a slippery path gives less friction. (a) True (b) False
38. 38.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
39. 39.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
40. 40.🪝 A load of 960 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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