Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 479 · 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. Zoya (180 N) sits 2 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.Which of these is a screw? (a) the tip of a nail (b) a well winch handle (c) a nut and bolt (d) a claw hammer on a nail
3. 3.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) make new energy (c) use a smaller force (d) switch off gravity
4. 4.True or false: powder on a carrom board gives less friction. (a) True (b) False
5. 5.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Zoya (170 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
10. 10.True or false: a movable pulley halves the effort. (a) True (b) False
11. 11.Which of these is caused by muscular force? (a) a fridge magnet sticks (b) a compass needle turns (c) squeezing a lemon (d) rubbing hands warms them
12. 12.🏋️ A force of 370 N did 1480 J of work. How many metres did the object move?
13. 13.⚖️ A lever bar balances. The load is 420 N at 10 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.True or false: a well winch handle is a wheel and axle. (a) False (b) True
15. 15.⚖️ A lever bar balances. The load is 700 N at 50 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.Which of these is caused by gravity? (a) an apple falls down (b) rubbing hands warms them (c) a rolling ball slows (d) brakes stop a bicycle
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
18. 18.💪 A cart is pulled to the right with 80 N and to the left with 90 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
19. 19.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.Which of these is a wheel and axle? (a) a window blind cord (b) a knife edge (c) a round doorknob (d) a playground slide
21. 21.⚖️ A seesaw balances. Ravi (800 N) sits ? m from the pivot on one side; Arjun (600 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
22. 22.⚙️ Which simple machine is a well winch handle? (a) wheel and axle (b) wedge (c) screw (d) inclined plane
23. 23.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 160 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
25. 25.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a wheel on a rod (d) a rope on a wheel
26. 26.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.⚖️ A lever bar balances. The load is 450 N at 10 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) friction (c) muscular force (d) gravity
29. 29.⚖️ A seesaw balances. Meena (600 N) sits 1 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.Which of these is caused by friction? (a) pedalling a cycle (b) a compass needle turns (c) a thrown ball comes down (d) rubbing hands warms them
31. 31.💪 Two children push a box to the right, one with 45 N and the other with 55 N. What is the net (total) force on the box, in newtons?
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
33. 33.True or false: a movable pulley only changes direction. (a) False (b) True
34. 34.⚖️ A seesaw balances. Asha (450 N) sits 1 m from the pivot on one side; Kabir (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
36. 36.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
37. 37.⚙️ Which simple machine is a wheelchair ramp? (a) wheel and axle (b) pulley (c) screw (d) inclined plane
38. 38.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) sand on a slippery path (d) a grippy rubber sole
39. 39.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
40. 40.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)

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