Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 173 · 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.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
2. 2.⚖️ A lever bar balances. The load is 200 N at 20 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.💪 A cart is pulled to the right with 25 N and to the left with 35 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
4. 4.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 2 (c) class 3
5. 5.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
6. 6.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
7. 7.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 150 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 400 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🏋️ A force of 350 N pushes a cart 9 m along the floor. How much work is done, in joules?
10. 10.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
11. 11.🔍 Which is the odd one out? (a) a round doorknob (b) a wood screw (c) a bottle cap (d) a nut and bolt
12. 12.True or false: a water tap handle is a wheel and axle. (a) False (b) True
13. 13.Which of these is a screw? (a) a window blind cord (b) a steering wheel (c) a flagpole rope wheel (d) a wood screw
14. 14.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its shape (d) change its colour
15. 15.🪝 A pulley system lifts a 520 N load with an effort of 260 N. What is its mechanical advantage (MA)?
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
17. 17.True or false: pulling up your socks is a pull. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
19. 19.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) oil on a squeaky hinge (d) skating on ice
20. 20.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
21. 21.Which of these is a wedge? (a) a playground slide (b) an axe blade (c) a steering wheel (d) a well-bucket rope wheel
22. 22.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
23. 23.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
24. 24.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
25. 25.⚖️ A seesaw balances. Asha (300 N) sits 1 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.True or false: a wood screw is a pulley. (a) True (b) False
27. 27.True or false: a movable pulley needs effort = load. (a) False (b) True
28. 28.True or false: opening a drawer is a pull. (a) False (b) True
29. 29.💪 Which force is at work: squeezing a lemon? (a) friction (b) magnetic force (c) muscular force (d) gravity
30. 30.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a tiny pulley (d) a ramp wrapped round
31. 31.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
32. 32.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
33. 33.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
35. 35.⚖️ A seesaw balances. Zoya (600 N) sits 1 m from the pivot on one side; Asha (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 40 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.🏋️ A force of 170 N pushes a cart 9 m along the floor. How much work is done, in joules?
38. 38.⚙️ Which simple machine is a seesaw? (a) screw (b) wheel and axle (c) wedge (d) lever
39. 39.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
40. 40.Which of these is caused by magnetic force? (a) a fridge magnet sticks (b) lifting a school bag (c) a rolling ball slows (d) squeezing a lemon

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