Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 959 · 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.True or false: pressing a doorbell is a pull. (a) False (b) True
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
3. 3.⚖️ A lever bar balances. The load is 700 N at 30 cm from the fulcrum. The effort is 210 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.🔍 Which is the odd one out? (a) a water tap handle (b) a chisel (c) a knife edge (d) the tip of a nail
5. 5.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
7. 7.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) friction (c) magnetic force (d) gravity
8. 8.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a flat ramp (d) a loose rope
9. 9.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
10. 10.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
11. 11.⚖️ A lever bar balances. The load is 90 N at 10 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
14. 14.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
15. 15.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
16. 16.🏋️ A 7 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.Which of these is caused by friction? (a) a fridge magnet sticks (b) a magnet picks up pins (c) a thrown ball comes down (d) a rolling ball slows
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
19. 19.Which of these is a pulley? (a) a round doorknob (b) a screw jack (c) an axe blade (d) a window blind cord
20. 20.🏋️ A force of 180 N pushes a cart 7 m along the floor. How much work is done, in joules?
21. 21.Which of these is a screw? (a) a jar lid (b) a steering wheel (c) a window blind cord (d) a seesaw
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a tyre with deep treads (d) a smooth steel slide
23. 23.Which of these is caused by gravity? (a) a thrown ball comes down (b) a rolling ball slows (c) rubbing hands warms them (d) squeezing a lemon
24. 24.🔍 Which is the odd one out? (a) a crane hook block (b) a wood screw (c) a nut and bolt (d) a screw jack
25. 25.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) oil on a squeaky hinge (d) skating on ice
26. 26.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
27. 27.⚖️ A lever bar balances. The load is 200 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
29. 29.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
30. 30.⚙️ Which simple machine is a wheelchair ramp? (a) inclined plane (b) screw (c) wedge (d) lever
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
32. 32.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 3 (c) class 2
33. 33.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
34. 34.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) use a smaller force (d) make new energy
35. 35.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Ravi (330 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
37. 37.True or false: a beam balance is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) the direction of pull (d) gravity
39. 39.⚖️ A seesaw balances. Meena (240 N) sits 4 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🪝 A bucket weighing 260 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)

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