Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 383 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.Which of these is a lever? (a) a truck loading ramp (b) a crane hook block (c) a round doorknob (d) a seesaw
3. 3.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a rope on a wheel (d) a wheel on a rod
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
5. 5.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
6. 6.💪 A box weighs 440 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
7. 7.⚖️ A seesaw balances. Meena (680 N) sits ? m from the pivot on one side; Ravi (510 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
8. 8.🔍 Which is the odd one out? (a) an axe blade (b) a nut and bolt (c) the tip of a nail (d) a chisel
9. 9.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) time taken (d) mass of fulcrum
10. 10.⚖️ A seesaw balances. Arjun (570 N) sits 2 m from the pivot on one side; Kabir (380 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
11. 11.True or false: a movable pulley stays in one place. (a) True (b) False
12. 12.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
13. 13.⚖️ A seesaw balances. Arjun (180 N) sits 3 m from the pivot on one side; Asha (540 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
15. 15.Which of these is caused by gravity? (a) a rolling ball slows (b) a river flows downhill (c) shoes grip the floor (d) pedalling a cycle
16. 16.True or false: pushing a swing is a push. (a) False (b) True
17. 17.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
18. 18.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 100 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 11 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
22. 22.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
23. 23.🪝 A bucket weighing 350 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
24. 24.🏋️ Pushing a crate 5 m took 1250 J of work. What force was used, in newtons?
25. 25.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
26. 26.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
27. 27.🪝 A bucket weighing 250 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
28. 28.🏋️ Pushing a crate 10 m took 900 J of work. What force was used, in newtons?
29. 29.⚙️ Which simple machine is a bottle opener? (a) screw (b) pulley (c) wedge (d) lever
30. 30.⚙️ Which simple machine is a crowbar? (a) lever (b) wheel and axle (c) inclined plane (d) wedge
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
32. 32.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 30 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
33. 33.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 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 smooth ramp is 10 m long and rises 2 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
36. 36.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
37. 37.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) False (b) True
38. 38.🏋️ A force of 20 N pushes a cart 8 m along the floor. How much work is done, in joules?
39. 39.True or false: a playground slide is an inclined plane. (a) True (b) False
40. 40.Which of these is an inclined plane? (a) a truck loading ramp (b) a nutcracker (c) the tip of a nail (d) a well-bucket rope wheel

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