Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 860 · 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 force of 500 N did 5000 J of work. How many metres did the object move?
2. 2.🪝 A pulley system lifts a 780 N load with an effort of 260 N. What is its mechanical advantage (MA)?
3. 3.🏋️ Pushing a crate 1 m took 440 J of work. What force was used, in newtons?
4. 4.💪 A bag has a mass of 33 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
5. 5.Which of these is caused by friction? (a) a fridge magnet sticks (b) a thrown ball comes down (c) rubbing hands warms them (d) an apple falls down
6. 6.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) near the fulcrum (c) on the fulcrum (d) far from the fulcrum
7. 7.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
8. 8.🏋️ Pushing a crate 2 m took 160 J of work. What force was used, in newtons?
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
10. 10.🏋️ A force of 380 N did 380 J of work. How many metres did the object move?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
13. 13.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
14. 14.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) oil on a squeaky hinge (d) a tyre with deep treads
16. 16.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
17. 17.🔍 Which is the odd one out? (a) a round doorknob (b) a well winch handle (c) a door stopper (d) a steering wheel
18. 18.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
19. 19.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 320 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
21. 21.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 280 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
22. 22.💪 Two children push a box to the right, one with 60 N and the other with 95 N. What is the net (total) force on the box, in newtons?
23. 23.⚙️ Which simple machine is a round doorknob? (a) wedge (b) wheel and axle (c) pulley (d) lever
24. 24.💪 Two children push a box to the right, one with 5 N and the other with 90 N. What is the net (total) force on the box, in newtons?
25. 25.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
26. 26.🪝 A bucket weighing 410 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
27. 27.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts an 840 N bucket on the axle, in newtons? (ideal)
28. 28.Which of these is a pulley? (a) a jar lid (b) a well-bucket rope wheel (c) a seesaw (d) a claw hammer on a nail
29. 29.Which of these is caused by gravity? (a) a magnet picks up pins (b) a fridge magnet sticks (c) shoes grip the floor (d) a thrown ball comes down
30. 30.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
31. 31.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a tyre with deep treads (d) sand on a slippery path
33. 33.⚙️ Which simple machine is a door stopper? (a) screw (b) wedge (c) inclined plane (d) lever
34. 34.💪 A bag has a mass of 48 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
35. 35.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
37. 37.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
38. 38.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) sand on a slippery path (d) a wheel on ball bearings
39. 39.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
40. 40.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 5 m, how many metres of rope must you pull?

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