Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 313 · 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.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) gravity (d) the direction of pull
2. 2.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Asha (680 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.⚖️ A lever bar balances. The load is 240 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?
4. 4.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
5. 5.⚖️ A seesaw balances. Kabir (190 N) sits ? m from the pivot on one side; Meena (570 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
6. 6.True or false: plucking a mango is a pull. (a) False (b) True
7. 7.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
8. 8.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
9. 9.💪 Which force is at work: rubbing hands warms them? (a) gravity (b) magnetic force (c) friction (d) muscular force
10. 10.Which of these is a lever? (a) a steering wheel (b) a bottle opener (c) a well-bucket rope wheel (d) the tip of a nail
11. 11.True or false: a wheelchair ramp is a pulley. (a) False (b) True
12. 12.True or false: a fixed pulley needs effort = load. (a) True (b) False
13. 13.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a ramp wrapped round (d) a tiny pulley
14. 14.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
15. 15.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
16. 16.🪝 A pulley system lifts a 420 N load with an effort of 140 N. What is its mechanical advantage (MA)?
17. 17.True or false: pulling up your socks is a pull. (a) True (b) False
18. 18.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the fulcrum (d) the load
19. 19.🏋️ A force of 240 N pushes a cart 9 m along the floor. How much work is done, in joules?
20. 20.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) farther from the pivot (d) closer to the pivot
21. 21.🪝 A pulley system lifts a 40 N load with an effort of 20 N. What is its mechanical advantage (MA)?
22. 22.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
23. 23.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
24. 24.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
25. 25.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
26. 26.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
27. 27.💪 Two children push a box to the right, one with 65 N and the other with 80 N. What is the net (total) force on the box, in newtons?
28. 28.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 3 (c) class 2
29. 29.💪 A cart is pulled to the right with 25 N and to the left with 15 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
30. 30.True or false: a truck loading ramp is a wheel and axle. (a) False (b) True
31. 31.Which of these is a wheel and axle? (a) a crane hook block (b) a steering wheel (c) a wood screw (d) a crowbar
32. 32.Which of these is a wheel and axle? (a) a truck loading ramp (b) a wood screw (c) a jar lid (d) a water tap handle
33. 33.True or false: plucking a mango is a push. (a) True (b) False
34. 34.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
35. 35.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) gravity (d) friction
36. 36.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
37. 37.True or false: a movable pulley halves the effort. (a) True (b) False
38. 38.⚙️ Which simple machine is a crane hook block? (a) screw (b) lever (c) pulley (d) wheel and axle
39. 39.🏋️ Pushing a crate 6 m took 2700 J of work. What force was used, in newtons?
40. 40.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful

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