Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 553 · 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.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 3 (d) 10
2. 2.💪 A cart is pulled to the right with 95 N and to the left with 105 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
3. 3.🏋️ A force of 320 N did 2880 J of work. How many metres did the object move?
4. 4.True or false: a seesaw is a screw. (a) True (b) False
5. 5.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
6. 6.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
7. 7.⚙️ Which simple machine is a knife edge? (a) pulley (b) lever (c) wheel and axle (d) wedge
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 11 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
9. 9.Which of these is an inclined plane? (a) a seesaw (b) a well winch handle (c) a truck loading ramp (d) a window blind cord
10. 10.⚙️ Which simple machine is a crowbar? (a) wedge (b) screw (c) pulley (d) lever
11. 11.🪝 A load of 440 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
12. 12.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
14. 14.⚖️ A lever bar balances. The load is 270 N at 30 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.True or false: a bottle cap is a screw. (a) True (b) False
16. 16.💪 A cart is pulled to the right with 85 N and to the left with 70 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
17. 17.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
18. 18.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
19. 19.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) closer to the pivot (d) farther from the pivot
20. 20.True or false: pressing a doorbell is a push. (a) True (b) False
21. 21.True or false: a movable pulley only changes direction. (a) False (b) True
22. 22.True or false: a movable pulley rises with the load. (a) True (b) False
23. 23.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
24. 24.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
25. 25.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a crane hook block (c) a bottle cap (d) a window blind cord
26. 26.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
27. 27.True or false: a door stopper is a screw. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 7 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
29. 29.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) make new energy (d) use a smaller force
30. 30.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
31. 31.True or false: skating on ice gives more friction. (a) False (b) True
32. 32.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) gravity (c) doubled (d) unbalanced
33. 33.🏋️ Pushing a crate 4 m took 360 J of work. What force was used, in newtons?
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
35. 35.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
36. 36.🏋️ Pushing a crate 10 m took 1200 J of work. What force was used, in newtons?
37. 37.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
38. 38.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
39. 39.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
40. 40.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Asha (510 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?

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