Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 689 · 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.Which of these is caused by muscular force? (a) pedalling a cycle (b) a rolling ball slows (c) rubbing hands warms them (d) a compass needle turns
2. 2.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
3. 3.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 3 (d) 6
4. 4.Which of these is caused by muscular force? (a) shoes grip the floor (b) a thrown ball comes down (c) lifting a school bag (d) rain falls to the ground
5. 5.Which of these is caused by magnetic force? (a) a fridge magnet sticks (b) rain falls to the ground (c) rubbing hands warms them (d) brakes stop a bicycle
6. 6.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
7. 7.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
8. 8.🪝 A pulley system lifts a 690 N load with an effort of 230 N. What is its mechanical advantage (MA)?
9. 9.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
12. 12.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
13. 13.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
15. 15.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
16. 16.💪 A cart is pulled to the right with 55 N and to the left with 40 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
18. 18.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
19. 19.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
20. 20.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 3 (c) class 2
21. 21.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
22. 22.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
24. 24.💪 A cart is pulled to the right with 25 N and to the left with 15 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
25. 25.True or false: a movable pulley needs effort = load. (a) True (b) False
26. 26.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a kind of wheel (d) a bent lever
27. 27.🔍 Which is the odd one out? (a) a wood screw (b) a wheelchair ramp (c) a nut and bolt (d) a jar lid
28. 28.⚙️ Which simple machine is a window blind cord? (a) wedge (b) screw (c) wheel and axle (d) pulley
29. 29.Which of these is an inclined plane? (a) a crane hook block (b) a door stopper (c) a window blind cord (d) a road up a hill
30. 30.True or false: an axe blade is an inclined plane. (a) True (b) False
31. 31.⚖️ A seesaw balances. Meena (280 N) sits 2 m from the pivot on one side; Asha (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
32. 32.⚖️ A seesaw balances. Meena (450 N) sits 2 m from the pivot on one side; Kabir (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
34. 34.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
35. 35.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
36. 36.💪 A box weighs 350 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
37. 37.⚖️ A seesaw balances. Ravi (510 N) sits 3 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
39. 39.🏋️ A force of 380 N pushes a cart 10 m along the floor. How much work is done, in joules?
40. 40.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?

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