Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 401 · 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 can a force NOT do? (a) start it moving (b) change its colour (c) stop it moving (d) change its shape
2. 2.Which of these is a screw? (a) a knife edge (b) a round doorknob (c) a nut and bolt (d) a crane hook block
3. 3.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
4. 4.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Asha (600 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a tyre with deep treads
6. 6.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
7. 7.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) make new energy (c) switch off gravity (d) use a smaller force
8. 8.🪝 A winch has a wheel of radius 12 cm and an axle of radius 3 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
9. 9.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
10. 10.💪 A box weighs 500 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
12. 12.True or false: a movable pulley halves the effort. (a) False (b) True
13. 13.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Ravi (600 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 80 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.🪝 A pulley system lifts a 660 N load with an effort of 220 N. What is its mechanical advantage (MA)?
16. 16.True or false: kicking a football is a push. (a) True (b) False
17. 17.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
18. 18.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a bent lever (d) a ramp wrapped round
19. 19.💪 A force is a … (a) push or a pull (b) type of sound (c) unit of time (d) kind of colour
20. 20.Which of these is an inclined plane? (a) a steering wheel (b) a wheelchair ramp (c) a flagpole rope wheel (d) a nutcracker
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
22. 22.🪝 A pulley system lifts a 920 N load with an effort of 230 N. What is its mechanical advantage (MA)?
23. 23.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
24. 24.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
25. 25.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
26. 26.💪 Two children push a box to the right, one with 25 N and the other with 20 N. What is the net (total) force on the box, in newtons?
27. 27.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
28. 28.True or false: a box pushed on carpet gives less friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
30. 30.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
31. 31.True or false: a movable pulley stays in one place. (a) True (b) False
32. 32.🪝 A load of 750 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.⚙️ Which simple machine is a screw jack? (a) lever (b) inclined plane (c) wheel and axle (d) screw
34. 34.⚙️ Which simple machine is a playground slide? (a) inclined plane (b) wheel and axle (c) lever (d) wedge
35. 35.True or false: chalk on a gym bar gives less friction. (a) False (b) True
36. 36.💪 Which force is at work: squeezing a lemon? (a) gravity (b) friction (c) muscular force (d) magnetic force
37. 37.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
38. 38.🪝 A pulley system lifts a 60 N load with an effort of 20 N. What is its mechanical advantage (MA)?
39. 39.True or false: a road up a hill is a lever. (a) True (b) False
40. 40.🏋️ Pushing a crate 4 m took 1560 J of work. What force was used, in newtons?

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