Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 683 · 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) gravity (b) the size of the load (c) the direction of pull (d) the colour of rope
2. 2.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
3. 3.Which of these is a lever? (a) a knife edge (b) a nutcracker (c) a flagpole rope wheel (d) a window blind cord
4. 4.💪 Which can a force NOT do? (a) start it moving (b) change its colour (c) change its shape (d) stop it moving
5. 5.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
7. 7.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
8. 8.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
9. 9.True or false: a window blind cord is a wedge. (a) True (b) False
10. 10.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 2 (c) class 3
11. 11.🪝 A pulley system lifts a 280 N load with an effort of 140 N. What is its mechanical advantage (MA)?
12. 12.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) time taken (d) distance from fulcrum
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 3 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
14. 14.🏋️ A force of 90 N pushes a cart 7 m along the floor. How much work is done, in joules?
15. 15.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
16. 16.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) True (b) False
17. 17.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
18. 18.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
19. 19.🏋️ A machine lifts a load of 640 N when you push with 160 N. What is its mechanical advantage (MA)?
20. 20.💪 Two children push a box to the right, one with 10 N and the other with 40 N. What is the net (total) force on the box, in newtons?
21. 21.⚙️ Which simple machine is a wood screw? (a) lever (b) pulley (c) wedge (d) screw
22. 22.⚙️ A screw is really … (a) a bent lever (b) a tiny pulley (c) a ramp wrapped round (d) a kind of wheel
23. 23.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
25. 25.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 2 (c) class 3
26. 26.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
27. 27.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
28. 28.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Meena (480 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.⚖️ A lever bar balances. The load is 180 N at 10 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.⚖️ What is the pivot point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
31. 31.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2600 N box up it, in newtons? (ideal ramp, no friction)
32. 32.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) load + effort (d) effort ÷ load
33. 33.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 3300 N box up it, in newtons? (ideal ramp, no friction)
34. 34.⚖️ A seesaw balances. Asha (300 N) sits 3 m from the pivot on one side; Zoya (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
35. 35.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
37. 37.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
38. 38.Which of these is a wedge? (a) a claw hammer on a nail (b) a steering wheel (c) a wood screw (d) the tip of a nail
39. 39.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
40. 40.💪 A box weighs 270 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?

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