Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 974 · 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 seesaw balances. Arjun (160 N) sits 2 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
3. 3.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
5. 5.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
6. 6.True or false: a fixed pulley rises with the load. (a) False (b) True
7. 7.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
8. 8.Which of these is caused by friction? (a) lifting a school bag (b) a river flows downhill (c) a rolling ball slows (d) an apple falls down
9. 9.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) newton (N) (d) litre (L)
10. 10.True or false: a movable pulley is on a flagpole top. (a) False (b) True
11. 11.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
12. 12.True or false: pulling up your socks is a pull. (a) False (b) True
13. 13.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
14. 14.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
15. 15.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
16. 16.🔍 Which is the odd one out? (a) a well winch handle (b) a steering wheel (c) a round doorknob (d) a crane hook block
17. 17.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
18. 18.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
19. 19.🏋️ A force of 130 N pushes a cart 2 m along the floor. How much work is done, in joules?
20. 20.True or false: pulling a cart is a pull. (a) True (b) False
21. 21.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
22. 22.⚖️ A seesaw balances. Ravi (520 N) sits 3 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
24. 24.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a loose rope (d) a sharp wedge
25. 25.🏋️ Pushing a crate 1 m took 430 J of work. What force was used, in newtons?
26. 26.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
27. 27.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Kabir (440 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.True or false: sand on a slippery path gives more friction. (a) False (b) True
29. 29.🏋️ A 13 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.True or false: a screw jack is a pulley. (a) False (b) True
31. 31.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
32. 32.🏋️ A force of 200 N did 1200 J of work. How many metres did the object move?
33. 33.💪 A box weighs 60 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
34. 34.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 20 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) the pulley
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
37. 37.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
38. 38.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
39. 39.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
40. 40.⚖️ A lever bar balances. The load is 640 N at ? cm from the fulcrum. The effort is 320 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?

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