Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 369 · 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.True or false: a rough doormat gives more friction. (a) True (b) False
2. 2.⚖️ 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 1 (c) class 3
3. 3.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
4. 4.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
5. 5.🪝 A load of 660 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.🏋️ Pushing a crate 4 m took 1440 J of work. What force was used, in newtons?
7. 7.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
9. 9.🪝 A winch has a wheel of radius 8 cm and an axle of radius 1 cm. What effort on the wheel lifts an 880 N bucket on the axle, in newtons? (ideal)
10. 10.💪 A box weighs 240 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
11. 11.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) gravity (d) wind
12. 12.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
13. 13.🪝 A load of 720 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
15. 15.💪 A cart is pulled to the right with 55 N and to the left with 55 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
16. 16.💪 A bag has a mass of 52 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
17. 17.🏋️ A force of 210 N pushes a cart 10 m along the floor. How much work is done, in joules?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
19. 19.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
21. 21.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) time taken (d) distance from fulcrum
22. 22.🔍 Which is the odd one out? (a) a nutcracker (b) a bottle opener (c) a well winch handle (d) a seesaw
23. 23.💪 A cart is pulled to the right with 70 N and to the left with 55 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
24. 24.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a bar on a pivot (d) a rope on a wheel
25. 25.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
27. 27.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
28. 28.True or false: drawing up a well bucket is a push. (a) True (b) False
29. 29.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
30. 30.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
31. 31.True or false: a grippy rubber sole gives more friction. (a) False (b) True
32. 32.True or false: hitting a cricket ball is a push. (a) True (b) False
33. 33.💪 Two children push a box to the right, one with 15 N and the other with 15 N. What is the net (total) force on the box, in newtons?
34. 34.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
35. 35.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) skating on ice (d) a tyre with deep treads
37. 37.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
38. 38.💪 Which force is at work: rubbing hands warms them? (a) gravity (b) muscular force (c) friction (d) magnetic force
39. 39.⚖️ A seesaw balances. Zoya (560 N) sits ? m from the pivot on one side; Ravi (560 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
40. 40.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) True (b) False

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