Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 363 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a grippy rubber sole (d) sand on a slippery path
5. 5.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
6. 6.True or false: a crane hook block is a pulley. (a) True (b) False
7. 7.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) wind (d) gravity
8. 8.💪 Two children push a box to the right, one with 75 N and the other with 60 N. What is the net (total) force on the box, in newtons?
9. 9.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
10. 10.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 2 (c) class 3
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
12. 12.💪 Which can a force NOT do? (a) change its shape (b) change its colour (c) stop it moving (d) start it moving
13. 13.True or false: a claw hammer on a nail is a lever. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
15. 15.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
16. 16.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
17. 17.⚙️ Which simple machine is a nutcracker? (a) wheel and axle (b) lever (c) pulley (d) screw
18. 18.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
19. 19.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Zoya (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
21. 21.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
22. 22.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
23. 23.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
24. 24.Which of these is a pulley? (a) a wood screw (b) a claw hammer on a nail (c) a bottle cap (d) a window blind cord
25. 25.⚖️ A lever bar balances. The load is 250 N at ? cm from the fulcrum. The effort is 250 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.💪 Which force is at work: squeezing a lemon? (a) friction (b) magnetic force (c) gravity (d) muscular force
27. 27.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
28. 28.⚙️ Which simple machine is a steering wheel? (a) wedge (b) inclined plane (c) screw (d) wheel and axle
29. 29.True or false: a nutcracker is a lever. (a) False (b) True
30. 30.🏋️ Pushing a crate 7 m took 630 J of work. What force was used, in newtons?
31. 31.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a loose rope (d) a flat ramp
32. 32.Which of these is caused by gravity? (a) a magnet picks up pins (b) a compass needle turns (c) rain falls to the ground (d) a fridge magnet sticks
33. 33.🪝 A winch has a wheel of radius 24 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1440 N bucket on the axle, in newtons? (ideal)
34. 34.💪 A cart is pulled to the right with 80 N and to the left with 70 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
35. 35.⚙️ Which simple machine is a crowbar? (a) screw (b) wheel and axle (c) pulley (d) lever
36. 36.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
37. 37.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
38. 38.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
40. 40.💪 Is kicking a football a push or a pull? (a) a push (b) a pull

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