Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 323 · 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 is the odd one out? (a) a window blind cord (b) a flagpole rope wheel (c) a crane hook block (d) a playground slide
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
3. 3.💪 A cart is pulled to the right with 30 N and to the left with 40 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
4. 4.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
5. 5.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
7. 7.🏋️ A force of 470 N did 940 J of work. How many metres did the object move?
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
9. 9.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
11. 11.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
12. 12.🏋️ Pushing a crate 8 m took 2080 J of work. What force was used, in newtons?
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
14. 14.💪 Two children push a box to the right, one with 80 N and the other with 30 N. What is the net (total) force on the box, in newtons?
15. 15.💪 Two children push a box to the right, one with 45 N and the other with 35 N. What is the net (total) force on the box, in newtons?
16. 16.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
17. 17.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
18. 18.💪 A box weighs 400 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
19. 19.True or false: a jar lid is a screw. (a) False (b) True
20. 20.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3
21. 21.🔍 Which is the odd one out? (a) a nutcracker (b) a steering wheel (c) a water tap handle (d) a well winch handle
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
23. 23.🪝 A bucket weighing 310 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
24. 24.True or false: pushing a swing is a pull. (a) False (b) True
25. 25.💪 Two children push a box to the right, one with 60 N and the other with 90 N. What is the net (total) force on the box, in newtons?
26. 26.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it
27. 27.⚙️ Which simple machine is a playground slide? (a) screw (b) inclined plane (c) wedge (d) wheel and axle
28. 28.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a smaller rod (axle) (d) a sharp wedge
29. 29.🏋️ Pushing a crate 3 m took 1170 J of work. What force was used, in newtons?
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
31. 31.⚖️ A lever bar balances. The load is 420 N at 30 cm from the fulcrum. The effort is 210 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.🏋️ A force of 70 N pushes a cart 1 m along the floor. How much work is done, in joules?
33. 33.💪 A bag has a mass of 24 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
34. 34.🔍 Which is the odd one out? (a) a knife edge (b) a flagpole rope wheel (c) an axe blade (d) the tip of a nail
35. 35.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the size of the load (d) the direction of pull
36. 36.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) muscular force (c) gravity (d) magnetic force
38. 38.⚖️ A seesaw balances. Zoya (680 N) sits ? m from the pivot on one side; Kabir (170 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
39. 39.Which of these is a wheel and axle? (a) the tip of a nail (b) a round doorknob (c) a crowbar (d) a playground slide
40. 40.🏋️ A force of 120 N did 600 J of work. How many metres did the object move?

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