Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 196 · 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 well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
2. 2.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) gravity (d) the direction of pull
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
4. 4.💪 Which force is at work: an apple falls down? (a) gravity (b) friction (c) magnetic force (d) muscular force
5. 5.True or false: hitting a cricket ball is a pull. (a) True (b) False
6. 6.Which of these is a pulley? (a) a bottle cap (b) the tip of a nail (c) a crane hook block (d) an axe blade
7. 7.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
8. 8.🏋️ A force of 470 N did 4700 J of work. How many metres did the object move?
9. 9.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.🏋️ A force of 490 N pushes a cart 6 m along the floor. How much work is done, in joules?
11. 11.⚖️ A seesaw balances. Meena (180 N) sits ? m from the pivot on one side; Asha (360 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
12. 12.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 2 (c) class 1
13. 13.💪 Which can a force NOT do? (a) change its shape (b) start it moving (c) stop it moving (d) change its colour
14. 14.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
15. 15.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
16. 16.True or false: pushing a trolley is a pull. (a) True (b) False
17. 17.True or false: a wet tiled floor gives more friction. (a) True (b) False
18. 18.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
19. 19.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a rough doormat
20. 20.True or false: pressing a doorbell is a pull. (a) False (b) True
21. 21.💪 Two children push a box to the right, one with 30 N and the other with 60 N. What is the net (total) force on the box, in newtons?
22. 22.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
24. 24.True or false: pulling a cart is a pull. (a) False (b) True
25. 25.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
26. 26.True or false: closing a drawer is a pull. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a crane hook block (c) a nutcracker (d) a seesaw
28. 28.🏋️ A force of 230 N did 1610 J of work. How many metres did the object move?
29. 29.Which of these is a pulley? (a) a round doorknob (b) a flagpole rope wheel (c) a well winch handle (d) a knife edge
30. 30.⚙️ Which simple machine is a bottle opener? (a) wheel and axle (b) screw (c) lever (d) inclined plane
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
32. 32.💪 In a tug of war, one team pulls left with 50 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
33. 33.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
34. 34.⚖️ A lever bar balances. The load is 200 N at 10 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) a wheel on ball bearings
36. 36.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a rope on a wheel (d) a wheel on a rod
37. 37.🏋️ A 19 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.⚖️ A lever bar balances. The load is 270 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) magnetic force (c) gravity (d) friction
40. 40.🏋️ Pushing a crate 5 m took 950 J of work. What force was used, in newtons?

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