Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 938 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
2. 2.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 2 (c) class 3
3. 3.True or false: opening a drawer is a pull. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
5. 5.💪 A cart is pulled to the right with 35 N and to the left with 20 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
6. 6.⚖️ A seesaw balances. Arjun (300 N) sits 1 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.Which of these is caused by gravity? (a) a fridge magnet sticks (b) squeezing a lemon (c) an apple falls down (d) a rolling ball slows
8. 8.⚖️ A lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 50 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
10. 10.Which of these is caused by magnetic force? (a) lifting a school bag (b) a magnet picks up pins (c) shoes grip the floor (d) a thrown ball comes down
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.⚖️ A seesaw balances. Arjun (220 N) sits 2 m from the pivot on one side; Meena (220 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
13. 13.True or false: a grippy rubber sole gives less friction. (a) True (b) False
14. 14.Which of these is caused by gravity? (a) brakes stop a bicycle (b) rubbing hands warms them (c) a magnet picks up pins (d) rain falls to the ground
15. 15.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
16. 16.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
17. 17.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a road up a hill (c) a truck loading ramp (d) a playground slide
18. 18.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
19. 19.Which of these is caused by muscular force? (a) brakes stop a bicycle (b) an apple falls down (c) lifting a school bag (d) a compass needle turns
20. 20.💪 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?
21. 21.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) True (b) False
22. 22.⚖️ A seesaw balances. Arjun (100 N) sits 1 m from the pivot on one side; Asha (100 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 45 N. What is the size of the net force, in newtons?
24. 24.⚖️ A seesaw balances. Meena (800 N) sits ? m from the pivot on one side; Ravi (200 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
25. 25.⚙️ Which simple machine is a seesaw? (a) lever (b) pulley (c) screw (d) wheel and axle
26. 26.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) a water tap handle (b) a wheelchair ramp (c) a steering wheel (d) a round doorknob
28. 28.True or false: pushing a swing is a push. (a) True (b) False
29. 29.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) two ramps back to back (d) a rope on a wheel
30. 30.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
31. 31.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
32. 32.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.⚙️ Which simple machine is the tip of a nail? (a) wheel and axle (b) wedge (c) screw (d) inclined plane
34. 34.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
35. 35.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
36. 36.💪 Two children push a box to the right, one with 45 N and the other with 95 N. What is the net (total) force on the box, in newtons?
37. 37.Which of these is caused by gravity? (a) lifting a school bag (b) a magnet picks up pins (c) brakes stop a bicycle (d) a river flows downhill
38. 38.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
39. 39.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?

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