Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 180 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
3. 3.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a ramp wrapped round (d) a tiny pulley
4. 4.True or false: a tug of war is a pull. (a) False (b) True
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
7. 7.Which of these is an inclined plane? (a) a playground slide (b) a wood screw (c) a flagpole rope wheel (d) a crowbar
8. 8.🪝 A pulley system lifts a 1000 N load with an effort of 250 N. What is its mechanical advantage (MA)?
9. 9.🔍 Which is the odd one out? (a) a well winch handle (b) a water tap handle (c) a wood screw (d) a steering wheel
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
11. 11.True or false: a tug of war is a push. (a) True (b) False
12. 12.🏋️ A force of 380 N pushes a cart 2 m along the floor. How much work is done, in joules?
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
14. 14.🔍 Which is the odd one out? (a) a truck loading ramp (b) a flagpole rope wheel (c) a window blind cord (d) a well-bucket rope wheel
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
16. 16.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Kabir (220 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.🪝 A pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
18. 18.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
19. 19.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Ravi (400 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.Which of these is a screw? (a) a playground slide (b) a wheelchair ramp (c) a screw jack (d) a seesaw
21. 21.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
22. 22.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 40 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
24. 24.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
25. 25.True or false: chalk on a gym bar gives more friction. (a) False (b) True
26. 26.💪 A box weighs 20 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
27. 27.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the axle
28. 28.True or false: a bottle opener is a class 1 lever (fulcrum in the middle). (a) True (b) False
29. 29.True or false: a fixed pulley halves the effort. (a) False (b) True
30. 30.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
31. 31.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
32. 32.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 6 (d) 12
33. 33.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
34. 34.💪 A box weighs 10 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
35. 35.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
36. 36.🏋️ A force of 260 N did 1040 J of work. How many metres did the object move?
37. 37.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
38. 38.🛞 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 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
40. 40.💪 A force is a … (a) kind of colour (b) unit of time (c) push or a pull (d) type of sound

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