Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 35 · 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: a smooth steel slide gives more friction. (a) True (b) False
2. 2.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the fulcrum (c) nothing (d) the load
3. 3.True or false: a playground slide is an inclined plane. (a) True (b) False
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
5. 5.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
6. 6.True or false: a movable pulley only changes direction. (a) False (b) True
7. 7.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a kind of wheel (d) a ramp wrapped round
8. 8.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
9. 9.⚖️ A lever bar balances. The load is 50 N at 30 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?
10. 10.Which of these is a pulley? (a) a well winch handle (b) a water tap handle (c) a well-bucket rope wheel (d) a jar lid
11. 11.⚖️ A seesaw balances. Zoya (760 N) sits ? m from the pivot on one side; Meena (760 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
12. 12.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
13. 13.⚖️ A lever bar balances. The load is 40 N at 20 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?
14. 14.⚖️ What is the pivot point of a lever called? (a) the effort (b) the axle (c) the fulcrum (d) the load
15. 15.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a wet tiled floor
17. 17.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 2 (c) class 3
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
19. 19.⚖️ A seesaw balances. Meena (260 N) sits ? m from the pivot on one side; Kabir (390 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
20. 20.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
21. 21.Which of these is a lever? (a) a round doorknob (b) a nutcracker (c) a window blind cord (d) a flagpole rope wheel
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, a carpet 10 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
23. 23.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
24. 24.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
25. 25.🏋️ A force of 370 N pushes a cart 1 m along the floor. How much work is done, in joules?
26. 26.True or false: a movable pulley is on a flagpole top. (a) False (b) True
27. 27.🏋️ A force of 40 N did 40 J of work. How many metres did the object move?
28. 28.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
29. 29.Which of these is a lever? (a) a bottle cap (b) a seesaw (c) a water tap handle (d) a round doorknob
30. 30.⚖️ A seesaw balances. Meena (480 N) sits 1 m from the pivot on one side; Ravi (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
32. 32.Which of these is a wedge? (a) a crowbar (b) a door stopper (c) a wood screw (d) a window blind cord
33. 33.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) the bar is short (d) turning effects match
34. 34.Which of these is an inclined plane? (a) a crowbar (b) a wheelchair ramp (c) a nut and bolt (d) a bottle cap
35. 35.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the fulcrum (c) the load (d) the effort
36. 36.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) switch off gravity (d) stop all friction
37. 37.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
39. 39.💪 In a tug of war, one team pulls left with 40 N and the other pulls right with 10 N. What is the size of the net force, in newtons?
40. 40.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2

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