Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 266 · 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.True or false: a fixed pulley stays in one place. (a) False (b) True
2. 2.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
3. 3.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
4. 4.⚙️ Which simple machine is a round doorknob? (a) lever (b) wedge (c) inclined plane (d) wheel and axle
5. 5.True or false: a door stopper is a wheel and axle. (a) True (b) False
6. 6.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
7. 7.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 90 N bucket on the axle, in newtons? (ideal)
8. 8.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
9. 9.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
10. 10.True or false: a grippy rubber sole gives less friction. (a) False (b) True
11. 11.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 80 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.⚖️ A lever bar balances. The load is 900 N at ? cm from the fulcrum. The effort is 90 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) friction (c) gravity (d) magnetic force
14. 14.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) True (b) False
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
17. 17.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
18. 18.⚙️ Which simple machine is a truck loading ramp? (a) inclined plane (b) pulley (c) lever (d) wedge
19. 19.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) use a smaller force (c) switch off gravity (d) stop all friction
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
22. 22.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
23. 23.🏋️ A force of 180 N pushes a cart 9 m along the floor. How much work is done, in joules?
24. 24.Which of these is caused by gravity? (a) a magnet picks up pins (b) brakes stop a bicycle (c) a thrown ball comes down (d) a rolling ball slows
25. 25.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the size of the load (d) the direction of pull
26. 26.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.True or false: a fishing rod is a class 2 lever (load in the middle). (a) True (b) False
28. 28.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Kabir (220 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
30. 30.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
31. 31.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) less effort (d) more effort
32. 32.True or false: your forearm is a class 1 lever (fulcrum in the middle). (a) True (b) False
33. 33.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
34. 34.⚙️ Which simple machine is a wheelchair ramp? (a) wedge (b) inclined plane (c) screw (d) lever
35. 35.Which of these is a lever? (a) a well-bucket rope wheel (b) a nutcracker (c) a door stopper (d) a knife edge
36. 36.🪝 A load of 660 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
37. 37.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
38. 38.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) True (b) False
39. 39.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a ramp wrapped round (d) a kind of wheel
40. 40.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids