Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 927 · 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.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
2. 2.🔍 Which is the odd one out? (a) a door stopper (b) a water tap handle (c) a knife edge (d) a chisel
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
5. 5.⚖️ A seesaw balances. Asha (300 N) sits 3 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.💪 Which force is at work: rain falls to the ground? (a) gravity (b) magnetic force (c) muscular force (d) friction
7. 7.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) the axle
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
10. 10.🏋️ A force of 140 N pushes a cart 2 m along the floor. How much work is done, in joules?
11. 11.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
12. 12.🪝 A pulley system lifts a 690 N load with an effort of 230 N. What is its mechanical advantage (MA)?
13. 13.🏋️ 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?
14. 14.🏋️ A force of 460 N pushes a cart 3 m along the floor. How much work is done, in joules?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
16. 16.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
17. 17.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
18. 18.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 360 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.🪝 A load of 600 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
20. 20.True or false: skating on ice gives more friction. (a) False (b) True
21. 21.🏋️ A force of 80 N pushes a cart 7 m along the floor. How much work is done, in joules?
22. 22.⚙️ Which simple machine is a round doorknob? (a) inclined plane (b) pulley (c) screw (d) wheel and axle
23. 23.💪 A cart is pulled to the right with 30 N and to the left with 40 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
24. 24.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
25. 25.True or false: a beam balance is a class 3 lever (effort in the middle). (a) False (b) True
26. 26.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the rock (c) on the fulcrum (d) near the fulcrum
27. 27.💪 Which force is at work: squeezing a lemon? (a) friction (b) gravity (c) magnetic force (d) muscular force
28. 28.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 910 N bucket on the axle, in newtons? (ideal)
29. 29.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
33. 33.Which of these is caused by gravity? (a) an apple falls down (b) a rolling ball slows (c) a magnet picks up pins (d) brakes stop a bicycle
34. 34.True or false: a door stopper is a wheel and axle. (a) False (b) True
35. 35.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
36. 36.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
37. 37.💪 A box weighs 40 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
38. 38.Which of these is caused by muscular force? (a) a fridge magnet sticks (b) pedalling a cycle (c) a river flows downhill (d) a thrown ball comes down
39. 39.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the load (d) the fulcrum
40. 40.⚖️ A lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 200 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?

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