Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 656 · 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 cart is pulled to the right with 80 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
2. 2.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) far from the fulcrum (c) on the fulcrum (d) on the rock
3. 3.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 400 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.⚖️ A seesaw balances. Meena (680 N) sits 2 m from the pivot on one side; Asha (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.💪 Which force is at work: a rolling ball slows? (a) friction (b) magnetic force (c) gravity (d) muscular force
6. 6.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
7. 7.Which of these is an inclined plane? (a) a playground slide (b) a flagpole rope wheel (c) a jar lid (d) a wood screw
8. 8.True or false: a bottle opener is an inclined plane. (a) True (b) False
9. 9.True or false: pressing a doorbell is a pull. (a) False (b) True
10. 10.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) friction (c) gravity (d) magnetic force
11. 11.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the load (d) the fulcrum
12. 12.🔍 Which is the odd one out? (a) a jar lid (b) a door stopper (c) a knife edge (d) an axe blade
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
14. 14.Which of these is a pulley? (a) a claw hammer on a nail (b) a round doorknob (c) a steering wheel (d) a well-bucket rope wheel
15. 15.Which of these is a pulley? (a) a seesaw (b) an axe blade (c) a chisel (d) a crane hook block
16. 16.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) False (b) True
17. 17.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
18. 18.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) gravity (c) muscular force (d) friction
19. 19.💪 A force is a … (a) kind of colour (b) unit of time (c) type of sound (d) push or a pull
20. 20.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
21. 21.💪 A box weighs 540 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
22. 22.🪝 A pulley system lifts an 840 N load with an effort of 280 N. What is its mechanical advantage (MA)?
23. 23.⚖️ Which class of lever is a fishing rod? (a) class 1 (b) class 2 (c) class 3
24. 24.⚙️ Which simple machine is a round doorknob? (a) wedge (b) wheel and axle (c) screw (d) inclined plane
25. 25.⚖️ A lever bar balances. The load is 480 N at 20 cm from the fulcrum. The effort is 160 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.⚖️ A seesaw balances. Kabir (140 N) sits 1 m from the pivot on one side; Ravi (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
28. 28.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
29. 29.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
30. 30.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
31. 31.💪 Which force pulls everything towards the Earth? (a) gravity (b) wind (c) magnetism (d) friction
32. 32.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
33. 33.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
34. 34.⚖️ A lever bar balances. The load is 120 N at 30 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) two ramps back to back (d) a wheel on a rod
36. 36.⚖️ A seesaw balances. Arjun (560 N) sits ? m from the pivot on one side; Ravi (560 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
37. 37.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 4800 N box up it, in newtons? (ideal ramp, no friction)
38. 38.True or false: pulling up your socks is a push. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) a smooth steel slide (d) oil on a squeaky hinge
40. 40.🏋️ Pushing a crate 2 m took 980 J of work. What force was used, in newtons?

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