Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 486 · 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.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.Which of these is a wedge? (a) a well winch handle (b) a chisel (c) a round doorknob (d) a flagpole rope wheel
3. 3.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
4. 4.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
5. 5.Which of these is caused by magnetic force? (a) lifting a school bag (b) shoes grip the floor (c) a river flows downhill (d) a compass needle turns
6. 6.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
7. 7.💪 In a tug of war, one team pulls right with 45 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
8. 8.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
9. 9.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) gravity (c) friction (d) magnetic force
10. 10.⚖️ A seesaw balances. Arjun (560 N) sits 3 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.True or false: a movable pulley halves the effort. (a) True (b) False
12. 12.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the fulcrum (c) on the rock (d) near the fulcrum
13. 13.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a wet tiled floor (d) chalk on a gym bar
14. 14.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
15. 15.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
16. 16.💪 A cart is pulled to the right with 50 N and to the left with 40 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
17. 17.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) time taken (d) distance from fulcrum
18. 18.True or false: pulling a cart is a pull. (a) False (b) True
19. 19.True or false: a movable pulley is on a flagpole top. (a) True (b) False
20. 20.True or false: pushing a swing is a push. (a) False (b) True
21. 21.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
23. 23.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
25. 25.Which of these is caused by friction? (a) a magnet picks up pins (b) an apple falls down (c) pedalling a cycle (d) rubbing hands warms them
26. 26.True or false: a beam balance is a class 3 lever (effort in the middle). (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) a crane hook block (b) a playground slide (c) a road up a hill (d) a truck loading ramp
28. 28.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
29. 29.⚖️ A lever bar balances. The load is 630 N at 50 cm from the fulcrum. The effort is 450 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
32. 32.💪 Two children push a box to the right, one with 15 N and the other with 45 N. What is the net (total) force on the box, in newtons?
33. 33.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 20 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.🪝 A bucket weighing 500 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.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
36. 36.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
37. 37.True or false: a bottle opener is a screw. (a) False (b) True
38. 38.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Ravi (140 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 1 (c) class 2
40. 40.Which of these is a wedge? (a) an axe blade (b) a crane hook block (c) a bottle cap (d) a round doorknob

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