Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 942 · 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 wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) a rope on a wheel (d) two ramps back to back
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
3. 3.⚖️ A lever bar balances. The load is 720 N at ? cm from the fulcrum. The effort is 160 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
5. 5.Which of these is caused by magnetic force? (a) pedalling a cycle (b) a river flows downhill (c) a compass needle turns (d) brakes stop a bicycle
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
8. 8.True or false: a seesaw is a lever. (a) True (b) False
9. 9.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
10. 10.Which of these is caused by friction? (a) rain falls to the ground (b) shoes grip the floor (c) a fridge magnet sticks (d) a river flows downhill
11. 11.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
12. 12.🔍 Which is the odd one out? (a) a road up a hill (b) a playground slide (c) a wheelchair ramp (d) a bottle cap
13. 13.True or false: a movable pulley needs effort = load. (a) False (b) True
14. 14.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
15. 15.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
16. 16.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 250 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.💪 Two children push a box to the right, one with 95 N and the other with 70 N. What is the net (total) force on the box, in newtons?
20. 20.⚖️ A lever bar balances. The load is 270 N at ? cm from the fulcrum. The effort is 30 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
22. 22.💪 Two children push a box to the right, one with 50 N and the other with 55 N. What is the net (total) force on the box, in newtons?
23. 23.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
24. 24.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
25. 25.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
27. 27.True or false: closing a drawer is a push. (a) False (b) True
28. 28.🪝 A bucket weighing 430 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
29. 29.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
30. 30.Which of these is a pulley? (a) a round doorknob (b) the tip of a nail (c) a window blind cord (d) a nutcracker
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a wet tiled floor (d) chalk on a gym bar
32. 32.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 450 N bucket on the axle, in newtons? (ideal)
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a carpet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
34. 34.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
35. 35.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a seesaw (c) a bottle opener (d) a knife edge
36. 36.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Ravi (720 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.💪 Two children push a box to the right, one with 100 N and the other with 20 N. What is the net (total) force on the box, in newtons?
38. 38.True or false: kicking a football is a pull. (a) False (b) True
39. 39.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank

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