Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 73 · 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 caused by friction? (a) shoes grip the floor (b) a fridge magnet sticks (c) rain falls to the ground (d) lifting a school bag
2. 2.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
3. 3.⚖️ A lever bar balances. The load is 120 N at 10 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
5. 5.⚖️ A lever bar balances. The load is 1000 N at 20 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.True or false: pulling up your socks is a push. (a) False (b) True
7. 7.True or false: a tug of war is a pull. (a) True (b) False
8. 8.🪝 A pulley system lifts an 840 N load with an effort of 210 N. What is its mechanical advantage (MA)?
9. 9.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
12. 12.🛞 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 carpet 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
13. 13.⚙️ Which simple machine is a jar lid? (a) screw (b) wedge (c) wheel and axle (d) lever
14. 14.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
15. 15.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
16. 16.💪 Which can a force NOT do? (a) change its shape (b) change its colour (c) stop it moving (d) start it moving
17. 17.True or false: a bottle opener is an inclined plane. (a) False (b) True
18. 18.⚙️ Which simple machine is an axe blade? (a) wedge (b) pulley (c) inclined plane (d) wheel and axle
19. 19.True or false: the tip of a nail is a wedge. (a) True (b) False
20. 20.True or false: a crane hook block is a lever. (a) True (b) False
21. 21.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
22. 22.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a wet tiled floor (d) oil on a squeaky hinge
23. 23.💪 Two children push a box to the right, one with 35 N and the other with 50 N. What is the net (total) force on the box, in newtons?
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
26. 26.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the pulley
27. 27.⚖️ A seesaw balances. Zoya (220 N) sits ? m from the pivot on one side; Asha (220 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
28. 28.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the fulcrum (c) the effort (d) the load
29. 29.💪 Which force is at work: rain falls to the ground? (a) friction (b) muscular force (c) magnetic force (d) gravity
30. 30.True or false: a tyre with deep treads gives more friction. (a) True (b) False
31. 31.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) False (b) True
32. 32.Which of these is a lever? (a) a screw jack (b) a chisel (c) a nutcracker (d) a round doorknob
33. 33.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Arjun (360 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🪝 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)
35. 35.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
36. 36.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
37. 37.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
39. 39.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
40. 40.⚖️ A lever bar balances. The load is 700 N at 40 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?

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