Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 891 · 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 gravity? (a) a fridge magnet sticks (b) a magnet picks up pins (c) a compass needle turns (d) a thrown ball comes down
2. 2.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 12 (d) 10
3. 3.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) the load floats (d) more effort needed
4. 4.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 400 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
5. 5.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
6. 6.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
9. 9.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
10. 10.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 1 (c) class 2
11. 11.True or false: a bottle opener is a class 2 lever (load in the middle). (a) True (b) False
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
13. 13.⚖️ A seesaw balances. Kabir (380 N) sits 4 m from the pivot on one side; Asha (760 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.💪 Which force is at work: a thrown ball comes down? (a) friction (b) magnetic force (c) gravity (d) muscular force
15. 15.⚖️ A lever bar balances. The load is 120 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?
16. 16.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Kabir (110 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.🏋️ A force of 330 N pushes a cart 3 m along the floor. How much work is done, in joules?
18. 18.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) the size of the load (d) gravity
19. 19.💪 A force is a … (a) kind of colour (b) unit of time (c) push or a pull (d) type of sound
20. 20.🏋️ A force of 450 N did 1350 J of work. How many metres did the object move?
21. 21.💪 A cart is pulled to the right with 35 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
22. 22.🪝 A pulley system lifts a 500 N load with an effort of 250 N. What is its mechanical advantage (MA)?
23. 23.True or false: pushing a swing is a pull. (a) True (b) False
24. 24.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
25. 25.⚙️ Which simple machine is a bottle opener? (a) pulley (b) screw (c) lever (d) inclined plane
26. 26.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) magnetic force (c) friction (d) gravity
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
28. 28.True or false: an axe blade is a wheel and axle. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
30. 30.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) sand on a slippery path (d) a box pushed on carpet
31. 31.Which of these is a pulley? (a) a crane hook block (b) a seesaw (c) a nutcracker (d) a nut and bolt
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
33. 33.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
34. 34.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a grippy rubber sole (d) oil on a squeaky hinge
35. 35.⚖️ A lever bar balances. The load is 200 N at 40 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
37. 37.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) make new energy (d) use a smaller force
38. 38.True or false: a movable pulley stays in one place. (a) False (b) True
39. 39.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.🔍 Which is the odd one out? (a) a bottle opener (b) a road up a hill (c) a wheelchair ramp (d) a playground slide

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