Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 187 · 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.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
2. 2.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
3. 3.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
4. 4.⚙️ Which simple machine is a nut and bolt? (a) screw (b) wedge (c) lever (d) pulley
5. 5.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
6. 6.⚖️ A lever bar balances. The load is 150 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?
7. 7.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1600 N bucket on the axle, in newtons? (ideal)
8. 8.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
9. 9.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a tiny pulley (d) a ramp wrapped round
10. 10.True or false: a bottle cap is a screw. (a) True (b) False
11. 11.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
12. 12.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 10 (c) 3 (d) 12
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
14. 14.🏋️ A force of 30 N pushes a cart 5 m along the floor. How much work is done, in joules?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
16. 16.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
17. 17.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
18. 18.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
19. 19.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
20. 20.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
21. 21.🔍 Which is the odd one out? (a) a wood screw (b) a bottle cap (c) a nut and bolt (d) a truck loading ramp
22. 22.⚖️ A seesaw balances. Ravi (190 N) sits 1 m from the pivot on one side; Kabir (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
25. 25.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
26. 26.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
27. 27.🪝 A pulley system lifts a 380 N load with an effort of 190 N. What is its mechanical advantage (MA)?
28. 28.Which of these is a wedge? (a) a water tap handle (b) a door stopper (c) a playground slide (d) a well winch handle
29. 29.Which of these is a wheel and axle? (a) a playground slide (b) a water tap handle (c) a knife edge (d) a seesaw
30. 30.🔍 Which is the odd one out? (a) a window blind cord (b) a crane hook block (c) a well-bucket rope wheel (d) a wood screw
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
32. 32.⚖️ A seesaw balances. Asha (320 N) sits 4 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
34. 34.True or false: sand on a slippery path gives less friction. (a) True (b) False
35. 35.True or false: pushing a swing is a push. (a) False (b) True
36. 36.True or false: pushing a swing is a pull. (a) True (b) False
37. 37.💪 Which force is at work: a rolling ball slows? (a) muscular force (b) magnetic force (c) friction (d) gravity
38. 38.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 3 (c) class 2
39. 39.True or false: pressing a doorbell is a pull. (a) False (b) True
40. 40.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) a rope on a wheel (d) two ramps back to back

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