Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 48 · 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.True or false: drawing up a well bucket is a push. (a) True (b) False
2. 2.⚖️ A lever bar balances. The load is 100 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.💪 A bag has a mass of 50 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
4. 4.💪 Two children push a box to the right, one with 80 N and the other with 75 N. What is the net (total) force on the box, in newtons?
5. 5.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
6. 6.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
7. 7.True or false: pulling a cart is a push. (a) False (b) True
8. 8.🏋️ Pushing a crate 1 m took 430 J of work. What force was used, in newtons?
9. 9.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) False (b) True
10. 10.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
11. 11.🏋️ A force of 40 N did 120 J of work. How many metres did the object move?
12. 12.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
13. 13.True or false: a crowbar is a wedge. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
15. 15.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
16. 16.True or false: a rough doormat gives less friction. (a) False (b) True
17. 17.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
19. 19.💪 A cart is pulled to the right with 60 N and to the left with 50 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
20. 20.💪 Which force is at work: lifting a school bag? (a) gravity (b) magnetic force (c) friction (d) muscular force
21. 21.⚖️ Which class of lever is a lemon squeezer? (a) class 2 (b) class 1 (c) class 3
22. 22.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
23. 23.🏋️ Pushing a crate 7 m took 2030 J of work. What force was used, in newtons?
24. 24.🔍 Which is the odd one out? (a) a nutcracker (b) the tip of a nail (c) a knife edge (d) a chisel
25. 25.True or false: a movable pulley halves the effort. (a) True (b) False
26. 26.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) balanced (d) gravity
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: a steering wheel is a wheel and axle. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) skating on ice (d) a tyre with deep treads
31. 31.True or false: hitting a cricket ball is a push. (a) False (b) True
32. 32.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) colour of bar (d) distance from fulcrum
33. 33.⚖️ A lever bar balances. The load is 90 N at 20 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?
34. 34.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
35. 35.True or false: pulling a cart is a pull. (a) True (b) False
36. 36.⚖️ A seesaw balances. Arjun (450 N) sits 4 m from the pivot on one side; Asha (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.💪 Two children push a box to the right, one with 100 N and the other with 90 N. What is the net (total) force on the box, in newtons?
38. 38.🏋️ A force of 50 N pushes a cart 2 m along the floor. How much work is done, in joules?
39. 39.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
40. 40.True or false: a well winch handle is a wheel and axle. (a) False (b) True

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