Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 740 · 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 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
3. 3.🪝 A bucket weighing 230 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
4. 4.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
5. 5.True or false: plucking a mango is a pull. (a) False (b) True
6. 6.True or false: opening a drawer is a pull. (a) True (b) False
7. 7.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
8. 8.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
9. 9.🏋️ A force of 90 N pushes a cart 8 m along the floor. How much work is done, in joules?
10. 10.🏋️ A force of 450 N pushes a cart 1 m along the floor. How much work is done, in joules?
11. 11.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) a round doorknob (b) a door stopper (c) the tip of a nail (d) a knife edge
13. 13.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
14. 14.Which of these is caused by gravity? (a) lifting a school bag (b) a fridge magnet sticks (c) shoes grip the floor (d) an apple falls down
15. 15.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 3 (c) class 1
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
17. 17.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
18. 18.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
19. 19.🏋️ A force of 450 N did 4050 J of work. How many metres did the object move?
20. 20.Which of these is caused by friction? (a) a magnet picks up pins (b) squeezing a lemon (c) a fridge magnet sticks (d) a rolling ball slows
21. 21.⚖️ A lever bar balances. The load is 720 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
23. 23.Which of these is a screw? (a) a truck loading ramp (b) a well-bucket rope wheel (c) a bottle opener (d) a nut and bolt
24. 24.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a tyre with deep treads (d) chalk on a gym bar
25. 25.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 11 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
28. 28.🏋️ Pushing a crate 3 m took 630 J of work. What force was used, in newtons?
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 80 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
30. 30.💪 In a tug of war, one team pulls right with 55 N and the other pulls left with 45 N. What is the size of the net force, in newtons?
31. 31.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
32. 32.🪝 A pulley system lifts a 440 N load with an effort of 220 N. What is its mechanical advantage (MA)?
33. 33.⚖️ A lever bar balances. The load is 20 N at 20 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.🏋️ A force of 420 N pushes a cart 10 m along the floor. How much work is done, in joules?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
36. 36.⚖️ A seesaw balances. Meena (300 N) sits ? m from the pivot on one side; Asha (200 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
37. 37.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
38. 38.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
40. 40.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) on the fulcrum (d) far from the fulcrum

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