Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 204 · 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.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
2. 2.⚙️ Which simple machine is a road up a hill? (a) wedge (b) wheel and axle (c) inclined plane (d) pulley
3. 3.⚙️ Which simple machine is a nut and bolt? (a) pulley (b) inclined plane (c) screw (d) wedge
4. 4.🏋️ A force of 490 N pushes a cart 6 m along the floor. How much work is done, in joules?
5. 5.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
6. 6.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 1 (c) class 3
7. 7.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the load (d) the fulcrum
8. 8.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the bar is short (d) the fulcrum moves
9. 9.🏋️ A force of 160 N did 320 J of work. How many metres did the object move?
10. 10.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
11. 11.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
12. 12.🛞 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 9 N, sandpaper 13 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
13. 13.⚖️ A seesaw balances. Arjun (360 N) sits 2 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.⚙️ Which simple machine is a flagpole rope wheel? (a) pulley (b) wheel and axle (c) wedge (d) lever
15. 15.💪 Which force pulls everything towards the Earth? (a) wind (b) friction (c) gravity (d) magnetism
16. 16.⚖️ A seesaw balances. Meena (330 N) sits 1 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.🏋️ A force of 80 N did 480 J of work. How many metres did the object move?
18. 18.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 6 (c) 10 (d) 12
19. 19.True or false: a movable pulley needs effort = load. (a) True (b) False
20. 20.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
21. 21.🪝 A bucket weighing 360 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
22. 22.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) stop all friction (d) switch off gravity
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
24. 24.True or false: pushing a swing is a push. (a) True (b) False
25. 25.Which of these is caused by gravity? (a) shoes grip the floor (b) brakes stop a bicycle (c) pedalling a cycle (d) a thrown ball comes down
26. 26.⚖️ A lever bar balances. The load is 630 N at ? cm from the fulcrum. The effort is 90 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.🏋️ A force of 130 N pushes a cart 8 m along the floor. How much work is done, in joules?
28. 28.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
29. 29.🏋️ A force of 460 N pushes a cart 2 m along the floor. How much work is done, in joules?
30. 30.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) powder on a carrom board (d) skating on ice
31. 31.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
33. 33.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
35. 35.🏋️ A 16 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
36. 36.True or false: skating on ice gives less friction. (a) False (b) True
37. 37.🏋️ A force of 420 N pushes a cart 5 m along the floor. How much work is done, in joules?
38. 38.🪝 A load of 500 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
40. 40.🏋️ A force of 220 N pushes a cart 1 m along the floor. How much work is done, in joules?

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