Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 494 · 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 160 N at 50 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) less effort needed (d) more effort needed
5. 5.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
8. 8.💪 A box weighs 60 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
9. 9.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
10. 10.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
11. 11.⚖️ A lever bar balances. The load is 700 N at 10 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
13. 13.True or false: a grippy rubber sole gives less friction. (a) False (b) True
14. 14.⚙️ Which simple machine is a well-bucket rope wheel? (a) lever (b) pulley (c) screw (d) inclined plane
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
16. 16.True or false: a pair of kitchen tongs is a class 2 lever (load in the middle). (a) True (b) False
17. 17.💪 Two children push a box to the right, one with 10 N and the other with 90 N. What is the net (total) force on the box, in newtons?
18. 18.⚖️ A seesaw balances. Ravi (560 N) sits ? m from the pivot on one side; Zoya (560 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
19. 19.🏋️ A force of 80 N pushes a cart 1 m along the floor. How much work is done, in joules?
20. 20.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
21. 21.Which of these is caused by magnetic force? (a) a fridge magnet sticks (b) brakes stop a bicycle (c) rubbing hands warms them (d) an apple falls down
22. 22.⚖️ A seesaw balances. Asha (510 N) sits ? m from the pivot on one side; Zoya (340 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
23. 23.True or false: a rough doormat gives less friction. (a) True (b) False
24. 24.⚖️ What is the pivot point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
25. 25.💪 Which force is at work: a magnet picks up pins? (a) gravity (b) friction (c) magnetic force (d) muscular force
26. 26.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
27. 27.⚙️ A wedge is … (a) a rope on a wheel (b) two ramps back to back (c) a wheel on a rod (d) a bar on a pivot
28. 28.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
29. 29.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a tiny pulley (d) a ramp wrapped round
30. 30.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
31. 31.Which of these is a screw? (a) a well winch handle (b) a bottle cap (c) a bottle opener (d) a well-bucket rope wheel
32. 32.True or false: a wood screw is a screw. (a) True (b) False
33. 33.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
34. 34.⚖️ A lever bar balances. The load is 500 N at 40 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
35. 35.⚙️ Which simple machine is a flagpole rope wheel? (a) wedge (b) lever (c) pulley (d) wheel and axle
36. 36.True or false: closing a drawer is a pull. (a) False (b) True
37. 37.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
39. 39.True or false: plucking a mango is a push. (a) False (b) True
40. 40.💪 In a tug of war, one team pulls right with 30 N and the other pulls left with 25 N. What is the size of the net force, in newtons?

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