Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 885 · 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 simple machine is a nutcracker? (a) inclined plane (b) lever (c) wheel and axle (d) screw
2. 2.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) far from the fulcrum (c) on the rock (d) near the fulcrum
3. 3.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
4. 4.💪 A box weighs 190 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
5. 5.🏋️ Pushing a crate 2 m took 100 J of work. What force was used, in newtons?
6. 6.💪 In a tug of war, one team pulls right with 30 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
7. 7.🪝 A bucket weighing 260 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
8. 8.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 3 (c) class 2
9. 9.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) a tyre with deep treads (d) sand on a slippery path
10. 10.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
11. 11.True or false: chalk on a gym bar gives more friction. (a) False (b) True
12. 12.⚖️ A lever bar balances. The load is 180 N at 10 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 6 (c) 10 (d) 12
14. 14.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
15. 15.🪝 A bucket weighing 300 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.True or false: kicking a football is a pull. (a) True (b) False
17. 17.Which of these is a lever? (a) a playground slide (b) a bottle opener (c) a round doorknob (d) an axe blade
18. 18.True or false: a fixed pulley only changes direction. (a) True (b) False
19. 19.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 200 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a ramp wrapped round (d) a tiny pulley
21. 21.💪 Two children push a box to the right, one with 10 N and the other with 65 N. What is the net (total) force on the box, in newtons?
22. 22.💪 A box weighs 240 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
23. 23.💪 A force is a … (a) unit of time (b) push or a pull (c) kind of colour (d) type of sound
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
25. 25.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) mass of fulcrum (d) colour of bar
26. 26.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
27. 27.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
28. 28.🪝 A bucket weighing 110 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
29. 29.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a loose rope (c) a flat ramp (d) a sharp wedge
30. 30.🪝 A pulley system lifts a 420 N load with an effort of 210 N. What is its mechanical advantage (MA)?
31. 31.💪 In which unit do we measure force? (a) litre (L) (b) metre (m) (c) newton (N) (d) second (s)
32. 32.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the effort (c) the fulcrum (d) the load
33. 33.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
34. 34.Which of these is a lever? (a) a flagpole rope wheel (b) a claw hammer on a nail (c) a bottle cap (d) a steering wheel
35. 35.⚖️ A seesaw balances. Arjun (260 N) sits 1 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.💪 A box weighs 510 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
38. 38.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
39. 39.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 20 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.⚙️ Which simple machine is a door stopper? (a) wheel and axle (b) wedge (c) pulley (d) lever

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