Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 374 · 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 of these is caused by gravity? (a) a rolling ball slows (b) a river flows downhill (c) lifting a school bag (d) a compass needle turns
2. 2.⚖️ A lever bar balances. The load is 300 N at 10 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
4. 4.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) time taken (d) distance from fulcrum
5. 5.💪 In a tug of war, one team pulls right with 30 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
6. 6.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
7. 7.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
8. 8.💪 Which force pulls everything towards the Earth? (a) magnetism (b) wind (c) friction (d) gravity
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
10. 10.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) the axle
11. 11.🔍 Which is the odd one out? (a) a knife edge (b) a door stopper (c) a chisel (d) a flagpole rope wheel
12. 12.⚖️ A seesaw balances. Ravi (160 N) sits 3 m from the pivot on one side; Asha (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
13. 13.💪 Two children push a box to the right, one with 85 N and the other with 35 N. What is the net (total) force on the box, in newtons?
14. 14.🏋️ A force of 120 N pushes a cart 9 m along the floor. How much work is done, in joules?
15. 15.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
16. 16.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
17. 17.True or false: a screw jack is an inclined plane. (a) False (b) True
18. 18.💪 Two children push a box to the right, one with 55 N and the other with 10 N. What is the net (total) force on the box, in newtons?
19. 19.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) the fulcrum (d) nothing
20. 20.True or false: opening a drawer is a push. (a) True (b) False
21. 21.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
22. 22.True or false: a nutcracker is a wedge. (a) True (b) False
23. 23.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
24. 24.💪 A bag has a mass of 3 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
25. 25.🪝 A load of 240 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
26. 26.⚖️ A seesaw balances. Ravi (300 N) sits 2 m from the pivot on one side; Kabir (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚙️ Which simple machine is a truck loading ramp? (a) inclined plane (b) lever (c) screw (d) wedge
28. 28.🏋️ A force of 130 N pushes a cart 10 m along the floor. How much work is done, in joules?
29. 29.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a jar lid (c) a well-bucket rope wheel (d) a window blind cord
30. 30.⚖️ A lever bar balances. The load is 300 N at 20 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.True or false: sand on a slippery path gives less friction. (a) True (b) False
32. 32.True or false: a broom when sweeping is a class 2 lever (load in the middle). (a) True (b) False
33. 33.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a smooth steel slide (d) a wet tiled floor
35. 35.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
36. 36.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
37. 37.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
38. 38.True or false: powder on a carrom board gives more friction. (a) True (b) False
39. 39.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
40. 40.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?

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