Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 854 · 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.🏋️ Pushing a crate 6 m took 1500 J of work. What force was used, in newtons?
2. 2.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
4. 4.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
5. 5.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
6. 6.🏋️ A force of 200 N pushes a cart 3 m along the floor. How much work is done, in joules?
7. 7.💪 Which force is at work: squeezing a lemon? (a) friction (b) gravity (c) magnetic force (d) muscular force
8. 8.🏋️ A force of 180 N pushes a cart 8 m along the floor. How much work is done, in joules?
9. 9.🏋️ Pushing a crate 1 m took 380 J of work. What force was used, in newtons?
10. 10.💪 A cart is pulled to the right with 25 N and to the left with 40 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
12. 12.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1400 N bucket on the axle, in newtons? (ideal)
13. 13.True or false: powder on a carrom board gives less friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
15. 15.⚖️ A lever bar balances. The load is 800 N at ? cm from the fulcrum. The effort is 500 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.⚖️ Which class of lever is a broom when sweeping? (a) class 3 (b) class 2 (c) class 1
17. 17.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats
18. 18.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
19. 19.🏋️ A 5 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
20. 20.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a wheel on ball bearings (d) skating on ice
22. 22.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a bent lever (d) a ramp wrapped round
23. 23.⚙️ Which simple machine is a knife edge? (a) screw (b) pulley (c) wedge (d) wheel and axle
24. 24.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 2 (c) class 1
25. 25.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
26. 26.💪 A force is a … (a) kind of colour (b) unit of time (c) type of sound (d) push or a pull
27. 27.🏋️ A force of 370 N pushes a cart 9 m along the floor. How much work is done, in joules?
28. 28.⚖️ A lever bar balances. The load is 560 N at 40 cm from the fulcrum. The effort is 280 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
30. 30.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 350 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a box pushed on carpet (d) chalk on a gym bar
32. 32.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.💪 In a tug of war, one team pulls right with 50 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
34. 34.True or false: opening a drawer is a push. (a) False (b) True
35. 35.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
36. 36.True or false: a movable pulley rises with the load. (a) True (b) False
37. 37.⚖️ A seesaw balances. Zoya (180 N) sits 4 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🏋️ 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?
39. 39.🏋️ A force of 120 N pushes a cart 2 m along the floor. How much work is done, in joules?
40. 40.💪 Which force is at work: a magnet picks up pins? (a) friction (b) muscular force (c) magnetic force (d) gravity

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