Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 758 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
2. 2.⚖️ A seesaw balances. Meena (520 N) sits 1 m from the pivot on one side; Zoya (130 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
3. 3.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a bar on a pivot (d) a rope on a wheel
4. 4.Which of these is a pulley? (a) an axe blade (b) a screw jack (c) a wood screw (d) a window blind cord
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
6. 6.💪 Two children push a box to the right, one with 95 N and the other with 55 N. What is the net (total) force on the box, in newtons?
7. 7.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a grippy rubber sole (d) sand on a slippery path
8. 8.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
9. 9.True or false: a round doorknob is a lever. (a) True (b) False
10. 10.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 20 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 12 (d) 10
12. 12.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) make new energy (d) use a smaller force
13. 13.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
14. 14.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
15. 15.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.Which of these is a screw? (a) a truck loading ramp (b) a nut and bolt (c) a seesaw (d) a claw hammer on a nail
17. 17.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
18. 18.True or false: a water tap handle is a wedge. (a) True (b) False
19. 19.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a kind of wheel (d) a bent lever
20. 20.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) powder on a carrom board (d) a wheel on ball bearings
21. 21.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
22. 22.💪 A force is a … (a) unit of time (b) type of sound (c) kind of colour (d) push or a pull
23. 23.💪 Which force is at work: a magnet picks up pins? (a) gravity (b) muscular force (c) magnetic force (d) friction
24. 24.⚖️ A lever bar balances. The load is 450 N at 40 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
26. 26.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
27. 27.💪 Which force is at work: a compass needle turns? (a) gravity (b) muscular force (c) magnetic force (d) friction
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) powder on a carrom board (d) a box pushed on carpet
29. 29.⚖️ A lever bar balances. The load is 160 N at 30 cm from the fulcrum. The effort is 240 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.True or false: pulling up your socks is a pull. (a) True (b) False
31. 31.🪝 A bucket weighing 50 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.⚖️ A seesaw balances. Zoya (560 N) sits 1 m from the pivot on one side; Arjun (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.Which of these is caused by gravity? (a) a rolling ball slows (b) brakes stop a bicycle (c) rain falls to the ground (d) lifting a school bag
34. 34.Which of these is caused by friction? (a) squeezing a lemon (b) rain falls to the ground (c) a river flows downhill (d) rubbing hands warms them
35. 35.True or false: pulling a cart is a pull. (a) False (b) True
36. 36.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 1 (c) class 2
37. 37.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
38. 38.🏋️ A force of 30 N pushes a cart 6 m along the floor. How much work is done, in joules?
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 90 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
40. 40.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1190 N bucket on the axle, in newtons? (ideal)

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