Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 175 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
2. 2.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
3. 3.⚖️ A seesaw balances. Kabir (800 N) sits 1 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 350 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.🏋️ A force of 410 N pushes a cart 10 m along the floor. How much work is done, in joules?
6. 6.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
7. 7.True or false: a smooth steel slide gives more friction. (a) False (b) True
8. 8.Which of these is caused by muscular force? (a) rubbing hands warms them (b) squeezing a lemon (c) a fridge magnet sticks (d) an apple falls down
9. 9.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a round doorknob (d) a door stopper
10. 10.💪 A cart is pulled to the right with 60 N and to the left with 45 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
11. 11.True or false: a rough doormat gives more friction. (a) False (b) True
12. 12.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
13. 13.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.⚙️ Which simple machine is an axe blade? (a) wedge (b) inclined plane (c) wheel and axle (d) pulley
15. 15.⚙️ A screw is really … (a) a bent lever (b) a tiny pulley (c) a kind of wheel (d) a ramp wrapped round
16. 16.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
17. 17.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 40 N bucket on the axle, in newtons? (ideal)
18. 18.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
20. 20.🏋️ A force of 410 N did 1640 J of work. How many metres did the object move?
21. 21.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the fulcrum (c) the effort (d) the load
22. 22.Which of these is a screw? (a) a jar lid (b) a chisel (c) a seesaw (d) a bottle opener
23. 23.True or false: pushing a trolley is a pull. (a) False (b) True
24. 24.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
25. 25.🪝 A bucket weighing 290 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
26. 26.⚖️ Turning effect = force × … (a) colour of bar (b) distance from fulcrum (c) time taken (d) mass of fulcrum
27. 27.🪝 A load of 360 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on a carpet than on ice?
29. 29.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) False (b) True
30. 30.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
31. 31.💪 A force is a … (a) type of sound (b) push or a pull (c) kind of colour (d) unit of time
32. 32.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) skating on ice (d) powder on a carrom board
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
34. 34.Which of these is a screw? (a) a water tap handle (b) a window blind cord (c) a wood screw (d) a well-bucket rope wheel
35. 35.⚖️ A seesaw balances. Arjun (400 N) sits ? m from the pivot on one side; Zoya (200 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
37. 37.🏋️ A 1 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
39. 39.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 300 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.Which of these is caused by magnetic force? (a) a thrown ball comes down (b) a river flows downhill (c) a fridge magnet sticks (d) squeezing a lemon

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