Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 809 · 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 lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 150 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
3. 3.🪝 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?
4. 4.🏋️ A force of 250 N did 500 J of work. How many metres did the object move?
5. 5.💪 Two children push a box to the right, one with 15 N and the other with 70 N. What is the net (total) force on the box, in newtons?
6. 6.🪝 A load of 460 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
7. 7.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) chalk on a gym bar (d) oil on a squeaky hinge
8. 8.Which of these is caused by magnetic force? (a) a river flows downhill (b) a compass needle turns (c) brakes stop a bicycle (d) a thrown ball comes down
9. 9.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
10. 10.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
11. 11.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Ravi (170 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) the bar is short (d) turning effects match
13. 13.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a smooth steel slide
14. 14.True or false: pressing a doorbell is a pull. (a) False (b) True
15. 15.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
16. 16.⚖️ A seesaw balances. Ravi (180 N) sits ? m from the pivot on one side; Zoya (180 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
17. 17.💪 Which force is at work: a thrown ball comes down? (a) friction (b) muscular force (c) gravity (d) magnetic force
18. 18.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
19. 19.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
20. 20.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) anywhere (d) on the pivot
21. 21.⚖️ A seesaw balances. Arjun (100 N) sits 1 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?
22. 22.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
23. 23.💪 Which force is at work: squeezing a lemon? (a) gravity (b) friction (c) magnetic force (d) muscular force
24. 24.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a bottle opener (c) a claw hammer on a nail (d) a nutcracker
25. 25.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 3 (c) class 1
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
27. 27.True or false: a claw hammer on a nail is an inclined plane. (a) False (b) True
28. 28.Which of these is a wheel and axle? (a) a truck loading ramp (b) a flagpole rope wheel (c) a round doorknob (d) a bottle cap
29. 29.Which of these is caused by friction? (a) a magnet picks up pins (b) a fridge magnet sticks (c) a rolling ball slows (d) rain falls to the ground
30. 30.💪 A box weighs 100 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
31. 31.💪 In a tug of war, one team pulls left with 70 N and the other pulls right with 65 N. What is the size of the net force, in newtons?
32. 32.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
34. 34.🏋️ A force of 120 N pushes a cart 4 m along the floor. How much work is done, in joules?
35. 35.True or false: powder on a carrom board gives less friction. (a) True (b) False
36. 36.💪 A box weighs 590 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
37. 37.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
38. 38.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
39. 39.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) friction (c) muscular force (d) gravity
40. 40.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) gravity (c) doubled (d) unbalanced

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