Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 388 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
2. 2.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 120 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.💪 In a tug of war, one team pulls right with 90 N and the other pulls left with 20 N. What is the size of the net force, in newtons?
4. 4.💪 Which force is at work: lifting a school bag? (a) gravity (b) muscular force (c) magnetic force (d) friction
5. 5.🪝 A bucket weighing 320 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.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
7. 7.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
8. 8.Which of these is a wheel and axle? (a) a seesaw (b) a well-bucket rope wheel (c) the tip of a nail (d) a well winch handle
9. 9.🔍 Which is the odd one out? (a) a playground slide (b) a door stopper (c) a wheelchair ramp (d) a road up a hill
10. 10.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
11. 11.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
12. 12.⚖️ A lever bar balances. The load is 400 N at ? cm from the fulcrum. The effort is 200 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.True or false: a rough doormat gives less friction. (a) True (b) False
14. 14.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
15. 15.🏋️ A force of 10 N did 90 J of work. How many metres did the object move?
16. 16.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a sharp wedge (c) a loose rope (d) a flat ramp
17. 17.Which of these is caused by muscular force? (a) squeezing a lemon (b) a compass needle turns (c) a fridge magnet sticks (d) a rolling ball slows
18. 18.True or false: plucking a mango is a pull. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
21. 21.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
23. 23.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
24. 24.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) newton (N) (d) litre (L)
25. 25.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
26. 26.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) friction (d) gravity
27. 27.⚖️ A lever bar balances. The load is 100 N at 20 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) balanced (d) gravity
29. 29.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
31. 31.True or false: the tip of a nail is a wedge. (a) True (b) False
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
33. 33.🏋️ A force of 260 N pushes a cart 1 m along the floor. How much work is done, in joules?
34. 34.⚖️ A seesaw balances. Ravi (320 N) sits 4 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
36. 36.🏋️ A force of 60 N pushes a cart 9 m along the floor. How much work is done, in joules?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 11 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.Which of these is a wheel and axle? (a) a seesaw (b) a water tap handle (c) a road up a hill (d) a nutcracker
39. 39.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a bent lever (d) a kind of wheel
40. 40.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the axle (d) the effort

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