Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 651 · 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. Meena (800 N) sits 1 m from the pivot on one side; Ravi (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) closer to the pivot (d) farther from the pivot
3. 3.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
4. 4.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
5. 5.True or false: a rough doormat gives less friction. (a) True (b) False
6. 6.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
7. 7.🏋️ A force of 270 N did 2700 J of work. How many metres did the object move?
8. 8.⚖️ A lever bar balances. The load is 240 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?
9. 9.⚖️ A lever bar balances. The load is 270 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.💪 A cart is pulled to the right with 50 N and to the left with 60 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
11. 11.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
12. 12.True or false: a well-bucket rope wheel is a wedge. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) a crane hook block (b) a well-bucket rope wheel (c) a window blind cord (d) a truck loading ramp
14. 14.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
15. 15.🏋️ A force of 180 N did 1260 J of work. How many metres did the object move?
16. 16.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) False (b) True
17. 17.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) more effort needed (d) less effort needed
18. 18.🏋️ Pushing a crate 2 m took 940 J of work. What force was used, in newtons?
19. 19.⚖️ A lever bar balances. The load is 240 N at 30 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
20. 20.⚖️ A seesaw balances. Arjun (200 N) sits ? m from the pivot on one side; Meena (100 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
21. 21.Which of these is a wheel and axle? (a) a flagpole rope wheel (b) a water tap handle (c) a wood screw (d) a wheelchair ramp
22. 22.True or false: powder on a carrom board gives more friction. (a) True (b) False
23. 23.True or false: a nut and bolt is a wedge. (a) False (b) True
24. 24.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
26. 26.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
27. 27.True or false: skating on ice gives more friction. (a) True (b) False
28. 28.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
29. 29.💪 Two children push a box to the right, one with 80 N and the other with 60 N. What is the net (total) force on the box, in newtons?
30. 30.💪 A bag has a mass of 9 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
31. 31.True or false: a movable pulley rises with the load. (a) False (b) True
32. 32.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 200 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
35. 35.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a truck loading ramp (c) a playground slide (d) a steering wheel
36. 36.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
37. 37.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
38. 38.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
39. 39.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) newton (N) (d) watt hour
40. 40.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) make new energy (d) stop all friction

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