Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 903 · 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 wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a flat ramp (d) a smaller rod (axle)
2. 2.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 30 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.💪 In which unit do we measure force? (a) litre (L) (b) second (s) (c) newton (N) (d) metre (m)
4. 4.⚖️ A lever bar balances. The load is 560 N at 50 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.🏋️ A machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
7. 7.💪 Two children push a box to the right, one with 45 N and the other with 90 N. What is the net (total) force on the box, in newtons?
8. 8.True or false: a movable pulley stays in one place. (a) False (b) True
9. 9.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
10. 10.⚙️ Which simple machine is a claw hammer on a nail? (a) pulley (b) screw (c) lever (d) inclined plane
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
12. 12.💪 A cart is pulled to the right with 55 N and to the left with 65 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
13. 13.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
14. 14.💪 Which force pulls everything towards the Earth? (a) gravity (b) wind (c) magnetism (d) friction
15. 15.🏋️ A force of 480 N did 4320 J of work. How many metres did the object move?
16. 16.💪 Two children push a box to the right, one with 40 N and the other with 10 N. What is the net (total) force on the box, in newtons?
17. 17.True or false: a fixed pulley stays in one place. (a) True (b) False
18. 18.🪝 A load of 120 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a rough doormat (d) a box pushed on carpet
20. 20.True or false: a nutcracker is a lever. (a) False (b) True
21. 21.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
22. 22.💪 A cart is pulled to the right with 40 N and to the left with 35 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
23. 23.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
24. 24.⚖️ A lever bar balances. The load is 50 N at 20 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
26. 26.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
27. 27.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Meena (130 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
29. 29.Which of these is a lever? (a) a wheelchair ramp (b) a flagpole rope wheel (c) a seesaw (d) the tip of a nail
30. 30.⚙️ Which simple machine is a seesaw? (a) wheel and axle (b) wedge (c) inclined plane (d) lever
31. 31.True or false: a crowbar is a lever. (a) False (b) True
32. 32.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) mass of fulcrum (d) time taken
33. 33.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
34. 34.🪝 A bucket weighing 90 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
35. 35.💪 Which force is at work: brakes stop a bicycle? (a) magnetic force (b) muscular force (c) friction (d) gravity
36. 36.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
37. 37.🏋️ A force of 490 N did 1470 J of work. How many metres did the object move?
38. 38.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 60 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a bent lever (d) a kind of wheel
40. 40.🔍 Which is the odd one out? (a) the tip of a nail (b) a road up a hill (c) a door stopper (d) a chisel

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