Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 321 · 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.🪝 A load of 480 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
2. 2.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
3. 3.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
4. 4.Which of these is a pulley? (a) the tip of a nail (b) a wood screw (c) a well-bucket rope wheel (d) a steering wheel
5. 5.🪝 A bucket weighing 100 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
7. 7.🪝 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)
8. 8.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
10. 10.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) the load floats (d) more effort needed
11. 11.True or false: a movable pulley stays in one place. (a) False (b) True
12. 12.💪 A cart is pulled to the right with 50 N and to the left with 60 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
13. 13.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) use a smaller force (d) make new energy
15. 15.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 250 N bucket on the axle, in newtons? (ideal)
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
17. 17.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 1 (c) class 3
18. 18.💪 A bag has a mass of 48 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
19. 19.🪝 A load of 400 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
20. 20.True or false: a crowbar is a screw. (a) True (b) False
21. 21.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the load (d) the fulcrum
22. 22.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
23. 23.⚖️ A lever bar balances. The load is 90 N at 30 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
24. 24.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Kabir (360 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
26. 26.🔍 Which is the odd one out? (a) an axe blade (b) a wood screw (c) a jar lid (d) a screw jack
27. 27.⚖️ A seesaw balances. Asha (300 N) sits ? m from the pivot on one side; Kabir (300 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
28. 28.True or false: a movable pulley only changes direction. (a) True (b) False
29. 29.💪 Two children push a box to the right, one with 55 N and the other with 60 N. What is the net (total) force on the box, in newtons?
30. 30.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
31. 31.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
32. 32.⚖️ A lever bar balances. The load is 350 N at 10 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?
33. 33.💪 A cart is pulled to the right with 95 N and to the left with 85 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
34. 34.💪 A bag has a mass of 42 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
36. 36.⚖️ A seesaw balances. Zoya (180 N) sits 4 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.🔍 Which is the odd one out? (a) a wheelchair ramp (b) the tip of a nail (c) an axe blade (d) a door stopper
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
39. 39.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1140 N bucket on the axle, in newtons? (ideal)
40. 40.💪 Two children push a box to the right, one with 90 N and the other with 50 N. What is the net (total) force on the box, in newtons?

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