Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 304 · 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 3 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the pulley (d) the load
2. 2.🏋️ A force of 470 N pushes a cart 7 m along the floor. How much work is done, in joules?
3. 3.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 12 (d) 3
4. 4.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
5. 5.🪝 A load of 900 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) anywhere (d) on the pivot
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
8. 8.True or false: chalk on a gym bar gives less friction. (a) False (b) True
9. 9.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
10. 10.True or false: a box pushed on carpet gives more friction. (a) True (b) False
11. 11.⚖️ A seesaw balances. Asha (110 N) sits 2 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?
12. 12.💪 Which force is at work: lifting a school bag? (a) gravity (b) muscular force (c) friction (d) magnetic force
13. 13.💪 Which force is at work: a magnet picks up pins? (a) magnetic force (b) muscular force (c) friction (d) gravity
14. 14.True or false: a grippy rubber sole gives more friction. (a) False (b) True
15. 15.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
18. 18.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
19. 19.Which of these is caused by gravity? (a) brakes stop a bicycle (b) lifting a school bag (c) pedalling a cycle (d) a thrown ball comes down
20. 20.💪 Two children push a box to the right, one with 40 N and the other with 60 N. What is the net (total) force on the box, in newtons?
21. 21.💪 Which force is at work: shoes grip the floor? (a) magnetic force (b) gravity (c) muscular force (d) friction
22. 22.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) mass of fulcrum (d) time taken
23. 23.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) both weights are equal (d) turning effects match
24. 24.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
25. 25.⚖️ A lever bar balances. The load is 20 N at 50 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 3 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
27. 27.💪 Which force is at work: a thrown ball comes down? (a) magnetic force (b) muscular force (c) friction (d) gravity
28. 28.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the fulcrum (d) the effort
29. 29.🪝 A bucket weighing 450 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
30. 30.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
31. 31.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
32. 32.Which of these is a wedge? (a) a nutcracker (b) a well-bucket rope wheel (c) an axe blade (d) a jar lid
33. 33.🏋️ A machine lifts a load of 660 N when you push with 110 N. What is its mechanical advantage (MA)?
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
35. 35.Which of these is caused by magnetic force? (a) brakes stop a bicycle (b) a fridge magnet sticks (c) rubbing hands warms them (d) shoes grip the floor
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
38. 38.🏋️ A force of 120 N did 600 J of work. How many metres did the object move?
39. 39.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) nothing
40. 40.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3

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