Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 136 · 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.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
2. 2.Which of these is a wedge? (a) a jar lid (b) a round doorknob (c) a chisel (d) a seesaw
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
4. 4.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts an 800 N bucket on the axle, in newtons? (ideal)
5. 5.True or false: a movable pulley needs effort = load. (a) True (b) False
6. 6.🏋️ A force of 40 N pushes a cart 4 m along the floor. How much work is done, in joules?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
8. 8.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
9. 9.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
10. 10.🏋️ A force of 140 N pushes a cart 4 m along the floor. How much work is done, in joules?
11. 11.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
13. 13.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
14. 14.⚖️ A lever bar balances. The load is 20 N at ? cm from the fulcrum. The effort is 30 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
18. 18.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
19. 19.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
20. 20.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a tyre with deep treads (d) oil on a squeaky hinge
21. 21.True or false: a water tap handle is a wheel and axle. (a) True (b) False
22. 22.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
24. 24.True or false: opening a drawer is a push. (a) False (b) True
25. 25.🪝 A pulley system lifts a 160 N load with an effort of 80 N. What is its mechanical advantage (MA)?
26. 26.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 1 (c) class 3
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
29. 29.⚙️ Which simple machine is a bottle opener? (a) lever (b) wheel and axle (c) screw (d) inclined plane
30. 30.⚖️ A seesaw balances. Kabir (800 N) sits ? m from the pivot on one side; Meena (400 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
31. 31.🪝 A pulley system lifts a 1080 N load with an effort of 270 N. What is its mechanical advantage (MA)?
32. 32.🔍 Which is the odd one out? (a) a window blind cord (b) a wheelchair ramp (c) a playground slide (d) a road up a hill
33. 33.🔍 Which is the odd one out? (a) a round doorknob (b) a wheelchair ramp (c) a well winch handle (d) a water tap handle
34. 34.🪝 A bucket weighing 350 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.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
36. 36.💪 Two children push a box to the right, one with 75 N and the other with 50 N. What is the net (total) force on the box, in newtons?
37. 37.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 3 (c) class 1
38. 38.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
40. 40.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 2 (c) class 3

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