Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 12 · 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 a wedge? (a) a truck loading ramp (b) a flagpole rope wheel (c) an axe blade (d) a round doorknob
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
3. 3.🔍 Which is the odd one out? (a) a water tap handle (b) a round doorknob (c) a nutcracker (d) a well winch handle
4. 4.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
5. 5.True or false: a claw hammer on a nail is a lever. (a) True (b) False
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
7. 7.True or false: a smooth steel slide gives less friction. (a) True (b) False
8. 8.True or false: a playground slide is a wheel and axle. (a) False (b) True
9. 9.🏋️ Pushing a crate 9 m took 2700 J of work. What force was used, in newtons?
10. 10.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
11. 11.⚙️ Which simple machine is a flagpole rope wheel? (a) pulley (b) lever (c) inclined plane (d) screw
12. 12.True or false: a jar lid is a screw. (a) False (b) True
13. 13.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) both weights are equal (d) turning effects match
14. 14.Which of these is a wedge? (a) a crowbar (b) a truck loading ramp (c) a jar lid (d) the tip of a nail
15. 15.⚖️ A seesaw balances. Ravi (120 N) sits ? m from the pivot on one side; Meena (480 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
16. 16.🪝 A pulley system lifts a 90 N load with an effort of 30 N. What is its mechanical advantage (MA)?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
19. 19.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Asha (190 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🪝 A pulley system lifts a 320 N load with an effort of 160 N. What is its mechanical advantage (MA)?
21. 21.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a smooth steel slide (d) skating on ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
23. 23.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) balanced (d) gravity
24. 24.⚙️ Which simple machine is a bottle cap? (a) wheel and axle (b) wedge (c) screw (d) pulley
25. 25.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 1 (c) class 2
26. 26.⚖️ A lever bar balances. The load is 240 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?
27. 27.💪 Which force is at work: squeezing a lemon? (a) gravity (b) muscular force (c) magnetic force (d) friction
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
29. 29.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
30. 30.💪 In which unit do we measure force? (a) litre (L) (b) second (s) (c) metre (m) (d) newton (N)
31. 31.💪 A box weighs 20 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
32. 32.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
33. 33.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 3 (c) class 2
34. 34.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
35. 35.Which of these is caused by friction? (a) a thrown ball comes down (b) rubbing hands warms them (c) a river flows downhill (d) lifting a school bag
36. 36.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a seesaw (c) a crowbar (d) a jar lid
37. 37.True or false: a smooth steel slide gives more friction. (a) True (b) False
38. 38.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
39. 39.True or false: closing a drawer is a pull. (a) False (b) True
40. 40.⚙️ Which simple machine is a road up a hill? (a) wheel and axle (b) lever (c) pulley (d) inclined plane

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