Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 882 · 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 muscular force? (a) shoes grip the floor (b) an apple falls down (c) lifting a school bag (d) rain falls to the ground
2. 2.⚙️ Which simple machine is a wood screw? (a) lever (b) screw (c) inclined plane (d) wheel and axle
3. 3.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 3 (c) class 1
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
5. 5.True or false: a movable pulley is on a flagpole top. (a) False (b) True
6. 6.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Asha (260 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a kind of wheel (d) a tiny pulley
8. 8.⚖️ A lever bar balances. The load is 560 N at ? cm from the fulcrum. The effort is 70 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
10. 10.💪 A bag has a mass of 28 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
11. 11.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) gravity (c) friction (d) muscular force
12. 12.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a rough doormat
13. 13.True or false: a flagpole rope wheel is a lever. (a) True (b) False
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.💪 In a tug of war, one team pulls left with 10 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
16. 16.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
18. 18.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
19. 19.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) farther from the pivot (d) on the pivot
20. 20.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Meena (540 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
22. 22.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
23. 23.True or false: skating on ice gives more friction. (a) False (b) True
24. 24.💪 In a tug of war, one team pulls right with 50 N and the other pulls left with 45 N. What is the size of the net force, in newtons?
25. 25.Which of these is a wedge? (a) a crowbar (b) a seesaw (c) a knife edge (d) a jar lid
26. 26.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) muscular force (d) friction
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
28. 28.🔍 Which is the odd one out? (a) a nutcracker (b) a crowbar (c) a bottle opener (d) the tip of a nail
29. 29.💪 A bag has a mass of 7 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
30. 30.🏋️ A force of 440 N pushes a cart 3 m along the floor. How much work is done, in joules?
31. 31.💪 A box weighs 270 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
32. 32.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
33. 33.Which of these is caused by muscular force? (a) an apple falls down (b) squeezing a lemon (c) rain falls to the ground (d) brakes stop a bicycle
34. 34.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 40 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.💪 In a tug of war, one team pulls right with 90 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
36. 36.💪 In a tug of war, one team pulls right with 10 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 6 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
39. 39.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
40. 40.🏋️ A force of 290 N pushes a cart 7 m along the floor. How much work is done, in joules?

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