Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 106 · 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.Which of these is a lever? (a) a seesaw (b) a water tap handle (c) a flagpole rope wheel (d) an axe blade
2. 2.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) lifting a school bag (c) a thrown ball comes down (d) shoes grip the floor
3. 3.Which of these is caused by gravity? (a) shoes grip the floor (b) a fridge magnet sticks (c) a thrown ball comes down (d) a rolling ball slows
4. 4.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
5. 5.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
6. 6.🪝 A load of 180 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
7. 7.Which of these is a wedge? (a) a wheelchair ramp (b) the tip of a nail (c) a bottle cap (d) a flagpole rope wheel
8. 8.⚖️ A lever bar balances. The load is 540 N at 20 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.⚖️ A seesaw balances. Meena (600 N) sits 4 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
11. 11.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
12. 12.💪 A bag has a mass of 37 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
13. 13.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
14. 14.⚖️ A seesaw balances. Ravi (560 N) sits 2 m from the pivot on one side; Meena (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
15. 15.💪 Which can a force NOT do? (a) start it moving (b) change its shape (c) change its colour (d) stop it moving
16. 16.🏋️ Pushing a crate 1 m took 160 J of work. What force was used, in newtons?
17. 17.💪 Two children push a box to the right, one with 5 N and the other with 60 N. What is the net (total) force on the box, in newtons?
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
19. 19.💪 A cart is pulled to the right with 100 N and to the left with 90 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
21. 21.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Meena (140 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
23. 23.🪝 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)
24. 24.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 2 (c) class 3
25. 25.🔍 Which is the odd one out? (a) a window blind cord (b) a flagpole rope wheel (c) a wheelchair ramp (d) a well-bucket rope wheel
26. 26.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) oil on a squeaky hinge (d) skating on ice
27. 27.True or false: a smooth steel slide gives more friction. (a) True (b) False
28. 28.🏋️ A force of 160 N pushes a cart 3 m along the floor. How much work is done, in joules?
29. 29.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) no change (d) less effort needed
30. 30.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
31. 31.🏋️ A force of 110 N did 660 J of work. How many metres did the object move?
32. 32.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
33. 33.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
34. 34.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) muscular force (c) gravity (d) friction
35. 35.True or false: a smooth steel slide gives less friction. (a) False (b) True
36. 36.True or false: a pair of kitchen tongs is a class 2 lever (load in the middle). (a) False (b) True
37. 37.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 360 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
39. 39.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
40. 40.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?

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