Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 991 · 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 longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
2. 2.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) the axle
3. 3.True or false: a door stopper is a pulley. (a) False (b) True
4. 4.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
5. 5.True or false: drawing up a well bucket is a pull. (a) False (b) True
6. 6.⚖️ A seesaw balances. Ravi (200 N) sits 4 m from the pivot on one side; Zoya (800 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
7. 7.Which of these is a pulley? (a) a seesaw (b) a well winch handle (c) a crane hook block (d) a crowbar
8. 8.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) use a smaller force (d) stop all friction
9. 9.True or false: sand on a slippery path gives less friction. (a) False (b) True
10. 10.True or false: a steering wheel is a wheel and axle. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) a wet tiled floor
12. 12.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
13. 13.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.Which of these is caused by magnetic force? (a) a fridge magnet sticks (b) rain falls to the ground (c) brakes stop a bicycle (d) a river flows downhill
16. 16.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
17. 17.⚖️ A seesaw balances. Ravi (130 N) sits 3 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?
18. 18.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
19. 19.💪 In a tug of war, one team pulls right with 90 N and the other pulls left with 50 N. What is the size of the net force, in newtons?
20. 20.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 360 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.Which of these is a screw? (a) a well-bucket rope wheel (b) an axe blade (c) a bottle cap (d) a playground slide
22. 22.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) mass of fulcrum (d) time taken
23. 23.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) powder on a carrom board (d) chalk on a gym bar
24. 24.💪 A box weighs 150 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
25. 25.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 20 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
27. 27.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 400 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.⚙️ Which simple machine is a steering wheel? (a) pulley (b) wheel and axle (c) inclined plane (d) wedge
29. 29.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
30. 30.True or false: a movable pulley rises with the load. (a) False (b) True
31. 31.⚖️ A lever bar balances. The load is 490 N at 50 cm from the fulcrum. The effort is 350 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
33. 33.🪝 A pulley system lifts a 420 N load with an effort of 210 N. What is its mechanical advantage (MA)?
34. 34.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
35. 35.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 1 (c) class 3
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
37. 37.💪 Two children push a box to the right, one with 70 N and the other with 70 N. What is the net (total) force on the box, in newtons?
38. 38.True or false: the tip of a nail is a wedge. (a) False (b) True
39. 39.True or false: skating on ice gives less friction. (a) False (b) True
40. 40.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley

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