Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 491 · 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 simple machine is a nutcracker? (a) wheel and axle (b) wedge (c) lever (d) screw
2. 2.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Kabir (320 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.True or false: a box pushed on carpet gives less friction. (a) True (b) False
4. 4.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
6. 6.🏋️ A force of 100 N pushes a cart 9 m along the floor. How much work is done, in joules?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
9. 9.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the effort (d) the fulcrum
10. 10.🛞 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 6 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
11. 11.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) time taken (d) colour of bar
12. 12.⚖️ A lever bar balances. The load is 90 N at 40 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?
13. 13.🏋️ A force of 410 N pushes a cart 3 m along the floor. How much work is done, in joules?
14. 14.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
15. 15.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) gravity (c) magnetic force (d) friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
17. 17.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
20. 20.🪝 A load of 540 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
21. 21.Which of these is caused by friction? (a) an apple falls down (b) lifting a school bag (c) a fridge magnet sticks (d) a rolling ball slows
22. 22.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
23. 23.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
24. 24.🔍 Which is the odd one out? (a) a wood screw (b) a water tap handle (c) a well winch handle (d) a steering wheel
25. 25.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a tyre with deep treads (d) a box pushed on carpet
26. 26.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
27. 27.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
28. 28.True or false: the tip of a nail is a lever. (a) False (b) True
29. 29.💪 A box weighs 160 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 110 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
31. 31.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
33. 33.True or false: a broom when sweeping is a class 2 lever (load in the middle). (a) True (b) False
34. 34.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
35. 35.💪 A cart is pulled to the right with 55 N and to the left with 45 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
37. 37.💪 Which force is at work: shoes grip the floor? (a) friction (b) magnetic force (c) muscular force (d) gravity
38. 38.💪 A bag has a mass of 28 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
39. 39.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
40. 40.🪝 A load of 360 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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