Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 982 · 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.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 80 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.⚖️ A seesaw balances. Ravi (100 N) sits ? m from the pivot on one side; Kabir (300 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
3. 3.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
4. 4.🛞 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 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
5. 5.🪝 A winch has a wheel of radius 7 cm and an axle of radius 1 cm. What effort on the wheel lifts a 350 N bucket on the axle, in newtons? (ideal)
6. 6.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 6 (c) 12 (d) 10
7. 7.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 3 (c) class 1
8. 8.⚖️ A lever bar balances. The load is 300 N at 30 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
10. 10.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 980 N bucket on the axle, in newtons? (ideal)
11. 11.💪 A box weighs 110 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
12. 12.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
13. 13.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
15. 15.💪 Which force is at work: squeezing a lemon? (a) muscular force (b) magnetic force (c) friction (d) gravity
16. 16.⚖️ A lever bar balances. The load is 350 N at ? cm from the fulcrum. The effort is 70 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.💪 Which force is at work: a compass needle turns? (a) gravity (b) magnetic force (c) friction (d) muscular force
18. 18.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
19. 19.⚖️ A seesaw balances. Ravi (480 N) sits 4 m from the pivot on one side; Asha (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1
21. 21.🪝 A bucket weighing 450 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
22. 22.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
23. 23.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) brakes stop a bicycle (c) shoes grip the floor (d) a river flows downhill
24. 24.💪 In a tug of war, one team pulls right with 50 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
25. 25.True or false: pulling a cart is a pull. (a) False (b) True
26. 26.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) gravity (d) balanced
27. 27.💪 In a tug of war, one team pulls right with 95 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
28. 28.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
29. 29.🏋️ Pushing a crate 4 m took 320 J of work. What force was used, in newtons?
30. 30.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
31. 31.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
32. 32.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 100 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.Which of these is a pulley? (a) a claw hammer on a nail (b) a window blind cord (c) a door stopper (d) a bottle opener
34. 34.⚖️ A lever bar balances. The load is 90 N at ? cm from the fulcrum. The effort is 40 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
35. 35.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the load (c) the fulcrum (d) the effort
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
37. 37.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) the load floats (d) no change
38. 38.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
40. 40.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)

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