Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 731 · 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.⚖️ A lever bar balances. The load is 210 N at 50 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?
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
3. 3.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a rope on a wheel (d) a bar on a pivot
4. 4.⚖️ A seesaw balances. Arjun (380 N) sits 4 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
6. 6.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
7. 7.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
8. 8.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 120 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.Which of these is a lever? (a) a wheelchair ramp (b) a well-bucket rope wheel (c) a crowbar (d) a flagpole rope wheel
10. 10.Which of these is caused by gravity? (a) a fridge magnet sticks (b) an apple falls down (c) a rolling ball slows (d) rubbing hands warms them
11. 11.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
12. 12.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
13. 13.⚙️ Which simple machine is a truck loading ramp? (a) lever (b) wedge (c) pulley (d) inclined plane
14. 14.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
15. 15.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a bent lever (d) a kind of wheel
16. 16.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
17. 17.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
18. 18.⚙️ Which simple machine is a nut and bolt? (a) wheel and axle (b) inclined plane (c) wedge (d) screw
19. 19.🏋️ Pushing a crate 3 m took 930 J of work. What force was used, in newtons?
20. 20.⚖️ A seesaw balances. Ravi (480 N) sits 4 m from the pivot on one side; Asha (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
21. 21.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 400 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
22. 22.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
23. 23.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
24. 24.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 1 (c) class 2
25. 25.⚙️ Which simple machine is a flagpole rope wheel? (a) pulley (b) lever (c) wedge (d) screw
26. 26.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
28. 28.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
29. 29.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 2 (c) class 3
30. 30.⚖️ A lever bar balances. The load is 240 N at 40 cm from the fulcrum. The effort is 320 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.True or false: a bottle opener is a class 2 lever (load in the middle). (a) False (b) True
32. 32.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
34. 34.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) a bottle opener (b) a crowbar (c) a claw hammer on a nail (d) a water tap handle
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
37. 37.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
39. 39.💪 A bag has a mass of 8 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
40. 40.🪝 A load of 340 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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