Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 834 · 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.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) gravity (c) doubled (d) balanced
2. 2.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) skating on ice
3. 3.💪 A cart is pulled to the right with 40 N and to the left with 55 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
4. 4.💪 Two children push a box to the right, one with 75 N and the other with 10 N. What is the net (total) force on the box, in newtons?
5. 5.⚖️ What is the pivot point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
6. 6.⚖️ A seesaw balances. Asha (540 N) sits ? m from the pivot on one side; Kabir (720 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
7. 7.💪 Two children push a box to the right, one with 95 N and the other with 60 N. What is the net (total) force on the box, in newtons?
8. 8.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
9. 9.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the direction of pull (d) the colour of rope
10. 10.🪝 A pulley system lifts a 560 N load with an effort of 280 N. What is its mechanical advantage (MA)?
11. 11.💪 In which unit do we measure force? (a) newton (N) (b) litre (L) (c) second (s) (d) metre (m)
12. 12.🏋️ A force of 450 N did 1800 J of work. How many metres did the object move?
13. 13.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.🔍 Which is the odd one out? (a) a well winch handle (b) a crowbar (c) a seesaw (d) a bottle opener
15. 15.Which of these is a screw? (a) a crane hook block (b) a window blind cord (c) a nut and bolt (d) a water tap handle
16. 16.⚙️ Which simple machine is a screw jack? (a) wheel and axle (b) screw (c) wedge (d) inclined plane
17. 17.True or false: pressing a doorbell is a push. (a) False (b) True
18. 18.🪝 A load of 750 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
20. 20.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
21. 21.🏋️ Pushing a crate 8 m took 960 J of work. What force was used, in newtons?
22. 22.🔍 Which is the odd one out? (a) a crowbar (b) a jar lid (c) a seesaw (d) a bottle opener
23. 23.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
24. 24.⚖️ A lever bar balances. The load is 40 N at 30 cm from the fulcrum. The effort is 30 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.🏋️ Pushing a crate 6 m took 840 J of work. What force was used, in newtons?
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
28. 28.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Arjun (160 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a loose rope (d) a sharp wedge
30. 30.⚖️ A seesaw balances. Ravi (600 N) sits 3 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) True (b) False
32. 32.🏋️ A force of 120 N did 360 J of work. How many metres did the object move?
33. 33.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
34. 34.Which of these is an inclined plane? (a) a water tap handle (b) a well-bucket rope wheel (c) a well winch handle (d) a wheelchair ramp
35. 35.⚖️ A lever bar balances. The load is 180 N at 10 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
37. 37.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
38. 38.🪝 A bucket weighing 50 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
39. 39.True or false: a bottle cap is a screw. (a) True (b) False
40. 40.True or false: a movable pulley needs effort = load. (a) True (b) False

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