Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 1 · 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 of these is a lever? (a) a crane hook block (b) a water tap handle (c) a chisel (d) a seesaw
2. 2.🪝 A bucket weighing 240 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.⚙️ A wedge is … (a) two ramps back to back (b) a wheel on a rod (c) a rope on a wheel (d) a bar on a pivot
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
5. 5.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) far from the fulcrum (d) on the fulcrum
6. 6.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
7. 7.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
8. 8.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
9. 9.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 90 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.⚖️ What is the pivot point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
11. 11.True or false: sand on a slippery path gives less friction. (a) True (b) False
12. 12.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
13. 13.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
14. 14.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
15. 15.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
16. 16.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 210 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
18. 18.🔍 Which is the odd one out? (a) a round doorknob (b) a steering wheel (c) a well winch handle (d) a flagpole rope wheel
19. 19.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a road up a hill (c) a truck loading ramp (d) a playground slide
20. 20.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
21. 21.💪 Two children push a box to the right, one with 5 N and the other with 50 N. What is the net (total) force on the box, in newtons?
22. 22.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
23. 23.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
24. 24.⚖️ A seesaw balances. Kabir (120 N) sits 1 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.⚙️ Which simple machine is a screw jack? (a) screw (b) pulley (c) wedge (d) lever
26. 26.💪 A cart is pulled to the right with 70 N and to the left with 65 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
27. 27.True or false: a fixed pulley only changes direction. (a) True (b) False
28. 28.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Ravi (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.True or false: a rough doormat gives less friction. (a) True (b) False
30. 30.True or false: plucking a mango is a push. (a) True (b) False
31. 31.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the fulcrum (c) the load (d) the effort
32. 32.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Ravi (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
34. 34.💪 A bag has a mass of 52 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
35. 35.⚖️ A seesaw balances. Zoya (300 N) sits ? m from the pivot on one side; Asha (150 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
36. 36.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 2 (c) class 3
37. 37.🏋️ A force of 250 N pushes a cart 6 m along the floor. How much work is done, in joules?
38. 38.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) make new energy (d) switch off gravity
39. 39.💪 Which force is at work: an apple falls down? (a) magnetic force (b) friction (c) muscular force (d) gravity
40. 40.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) friction (c) gravity (d) magnetic force

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