Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 140 · 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 270 N at 10 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.Which of these is caused by gravity? (a) rain falls to the ground (b) pedalling a cycle (c) a fridge magnet sticks (d) lifting a school bag
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
4. 4.⚖️ A lever bar balances. The load is 90 N at 50 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 100 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
6. 6.⚖️ A lever bar balances. The load is 540 N at ? cm from the fulcrum. The effort is 240 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
8. 8.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
9. 9.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
10. 10.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Meena (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 3 (d) 10
12. 12.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 2 (c) class 3
13. 13.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) stop all friction (d) make new energy
14. 14.True or false: a smooth steel slide gives more friction. (a) True (b) False
15. 15.True or false: a steering wheel is a screw. (a) False (b) True
16. 16.True or false: a screw jack is a lever. (a) False (b) True
17. 17.True or false: drawing up a well bucket is a pull. (a) False (b) True
18. 18.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
19. 19.💪 Which force is at work: squeezing a lemon? (a) muscular force (b) magnetic force (c) gravity (d) friction
20. 20.💪 A force is a … (a) unit of time (b) kind of colour (c) push or a pull (d) type of sound
21. 21.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
22. 22.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
23. 23.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 100 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
25. 25.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
26. 26.🏋️ A force of 450 N did 1800 J of work. How many metres did the object move?
27. 27.💪 A cart is pulled to the right with 50 N and to the left with 45 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
28. 28.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
29. 29.Which of these is caused by magnetic force? (a) pedalling a cycle (b) rubbing hands warms them (c) a compass needle turns (d) lifting a school bag
30. 30.⚖️ A seesaw balances. Arjun (480 N) sits 4 m from the pivot on one side; Ravi (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
31. 31.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
32. 32.🔍 Which is the odd one out? (a) the tip of a nail (b) a knife edge (c) a road up a hill (d) a chisel
33. 33.🪝 A pulley system lifts a 440 N load with an effort of 110 N. What is its mechanical advantage (MA)?
34. 34.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
35. 35.⚖️ A lever bar balances. The load is 150 N at 20 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.⚖️ A lever bar balances. The load is 120 N at 30 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.🪝 A pulley system lifts a 420 N load with an effort of 140 N. What is its mechanical advantage (MA)?
38. 38.True or false: a playground slide is a pulley. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) the tip of a nail (b) a door stopper (c) a knife edge (d) a round doorknob

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