Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 505 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 110 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
2. 2.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1000 N bucket on the axle, in newtons? (ideal)
3. 3.True or false: sand on a slippery path gives less friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
5. 5.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 3 (c) class 1
6. 6.🪝 A winch has a wheel of radius 15 cm and an axle of radius 3 cm. What effort on the wheel lifts a 750 N bucket on the axle, in newtons? (ideal)
7. 7.Which of these is a pulley? (a) a window blind cord (b) a claw hammer on a nail (c) a playground slide (d) the tip of a nail
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 11 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
9. 9.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
10. 10.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
11. 11.🏋️ A force of 490 N did 4900 J of work. How many metres did the object move?
12. 12.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 200 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
14. 14.True or false: chalk on a gym bar gives more friction. (a) True (b) False
15. 15.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) far from the fulcrum (d) near the fulcrum
16. 16.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
17. 17.Which of these is a wheel and axle? (a) a chisel (b) a well-bucket rope wheel (c) a truck loading ramp (d) a water tap handle
18. 18.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
19. 19.True or false: kicking a football is a pull. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
21. 21.🪝 A load of 120 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
22. 22.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
23. 23.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
24. 24.Which of these is a wedge? (a) a road up a hill (b) a wood screw (c) an axe blade (d) a window blind cord
25. 25.⚖️ A seesaw balances. Zoya (600 N) sits ? m from the pivot on one side; Asha (800 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
26. 26.True or false: hitting a cricket ball is a pull. (a) False (b) True
27. 27.🏋️ A force of 460 N pushes a cart 6 m along the floor. How much work is done, in joules?
28. 28.True or false: pulling a cart is a push. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
31. 31.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
32. 32.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the effort (d) the fulcrum
33. 33.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
34. 34.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
35. 35.🏋️ A force of 100 N did 100 J of work. How many metres did the object move?
36. 36.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
37. 37.🔍 Which is the odd one out? (a) a seesaw (b) a claw hammer on a nail (c) a nutcracker (d) a well-bucket rope wheel
38. 38.💪 A cart is pulled to the right with 25 N and to the left with 25 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
39. 39.⚖️ A lever bar balances. The load is 200 N at 50 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)

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