Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 174 · 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.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) nothing
2. 2.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
3. 3.True or false: closing a drawer is a pull. (a) True (b) False
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
6. 6.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
7. 7.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) a rough doormat (d) sand on a slippery path
8. 8.True or false: a movable pulley needs effort = load. (a) False (b) True
9. 9.Which of these is a lever? (a) the tip of a nail (b) a nutcracker (c) a jar lid (d) a well-bucket rope wheel
10. 10.Which of these is caused by muscular force? (a) an apple falls down (b) a thrown ball comes down (c) rain falls to the ground (d) squeezing a lemon
11. 11.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) gravity (c) friction (d) muscular force
12. 12.💪 In a tug of war, one team pulls right with 70 N and the other pulls left with 45 N. What is the size of the net force, in newtons?
13. 13.💪 A box weighs 230 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
14. 14.🪝 A load of 630 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
15. 15.⚖️ A seesaw balances. Asha (160 N) sits 1 m from the pivot on one side; Ravi (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.True or false: a fixed pulley halves the effort. (a) True (b) False
17. 17.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
18. 18.True or false: pressing a doorbell is a push. (a) True (b) False
19. 19.🏋️ A force of 10 N pushes a cart 8 m along the floor. How much work is done, in joules?
20. 20.🏋️ A machine lifts a load of 480 N when you push with 120 N. What is its mechanical advantage (MA)?
21. 21.💪 Which force is at work: an apple falls down? (a) friction (b) magnetic force (c) gravity (d) muscular force
22. 22.💪 Which force is at work: a river flows downhill? (a) muscular force (b) friction (c) gravity (d) magnetic force
23. 23.⚖️ A lever bar balances. The load is 100 N at 30 cm from the fulcrum. The effort is 30 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
24. 24.💪 A force is a … (a) push or a pull (b) kind of colour (c) type of sound (d) unit of time
25. 25.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the bar is short (d) the fulcrum moves
26. 26.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
27. 27.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) balanced (d) gravity
28. 28.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 8 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
30. 30.🏋️ A force of 180 N did 900 J of work. How many metres did the object move?
31. 31.💪 A cart is pulled to the right with 40 N and to the left with 45 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
32. 32.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Meena (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
34. 34.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the pulley (d) the effort
35. 35.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
36. 36.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
37. 37.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
38. 38.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) on the rock (c) near the fulcrum (d) far from the fulcrum
39. 39.🏋️ Pushing a crate 2 m took 580 J of work. What force was used, in newtons?
40. 40.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction

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