Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 765 · 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.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
2. 2.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
3. 3.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
4. 4.🏋️ A force of 70 N pushes a cart 6 m along the floor. How much work is done, in joules?
5. 5.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a grippy rubber sole (d) a box pushed on carpet
6. 6.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
7. 7.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) make new energy (c) use a smaller force (d) switch off gravity
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
9. 9.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
11. 11.🏋️ A force of 80 N pushes a cart 7 m along the floor. How much work is done, in joules?
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) chalk on a gym bar (d) skating on ice
13. 13.⚖️ A seesaw balances. Meena (680 N) sits 4 m from the pivot on one side; Asha (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
15. 15.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Meena (680 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a window blind cord (c) a bottle opener (d) a flagpole rope wheel
18. 18.⚖️ A lever bar balances. The load is 120 N at 20 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
19. 19.💪 A bag has a mass of 13 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 3 (c) class 2
21. 21.🏋️ A force of 340 N pushes a cart 2 m along the floor. How much work is done, in joules?
22. 22.Which of these is a screw? (a) a playground slide (b) a bottle cap (c) a road up a hill (d) a water tap handle
23. 23.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the load (d) the fulcrum
24. 24.⚖️ A lever bar balances. The load is 640 N at 10 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?
25. 25.⚖️ A seesaw balances. Zoya (420 N) sits 2 m from the pivot on one side; Meena (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
27. 27.⚙️ A wedge is … (a) two ramps back to back (b) a rope on a wheel (c) a wheel on a rod (d) a bar on a pivot
28. 28.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
29. 29.True or false: a rough doormat gives more friction. (a) False (b) True
30. 30.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
31. 31.⚖️ Which class of lever is a beam balance? (a) class 2 (b) class 1 (c) class 3
32. 32.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
33. 33.🪝 A pulley system lifts a 680 N load with an effort of 170 N. What is its mechanical advantage (MA)?
34. 34.True or false: a seesaw is a lever. (a) True (b) False
35. 35.True or false: sand on a slippery path gives less friction. (a) False (b) True
36. 36.🪝 A pulley system lifts a 960 N load with an effort of 240 N. What is its mechanical advantage (MA)?
37. 37.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🏋️ Pushing a crate 6 m took 2400 J of work. What force was used, in newtons?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on ice?
40. 40.True or false: skating on ice gives less friction. (a) False (b) True

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