Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 839 · 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 save rubber (c) to grip the road (d) to look nice
2. 2.Which of these is caused by magnetic force? (a) pedalling a cycle (b) a magnet picks up pins (c) a rolling ball slows (d) rain falls to the ground
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
4. 4.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
5. 5.True or false: a playground slide is an inclined plane. (a) False (b) True
6. 6.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Asha (380 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.True or false: plucking a mango is a push. (a) False (b) True
8. 8.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 400 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.Which of these is a wedge? (a) the tip of a nail (b) a well-bucket rope wheel (c) a jar lid (d) a screw jack
10. 10.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Kabir (680 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) True (b) False
12. 12.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
13. 13.🪝 A bucket weighing 50 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
14. 14.Which of these is caused by muscular force? (a) a magnet picks up pins (b) squeezing a lemon (c) a river flows downhill (d) an apple falls down
15. 15.🪝 A pulley system lifts a 120 N load with an effort of 30 N. What is its mechanical advantage (MA)?
16. 16.🏋️ A force of 130 N pushes a cart 2 m along the floor. How much work is done, in joules?
17. 17.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
18. 18.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
19. 19.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
20. 20.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the fulcrum (d) the load
21. 21.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
22. 22.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
23. 23.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
24. 24.⚙️ 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
25. 25.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (680 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.💪 Two children push a box to the right, one with 5 N and the other with 35 N. What is the net (total) force on the box, in newtons?
27. 27.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
29. 29.True or false: a rough doormat gives more friction. (a) False (b) True
30. 30.True or false: a grippy rubber sole gives less friction. (a) True (b) False
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
32. 32.⚙️ Which simple machine is a wheelchair ramp? (a) inclined plane (b) wheel and axle (c) wedge (d) lever
33. 33.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
34. 34.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
35. 35.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a kind of wheel (d) a tiny pulley
36. 36.True or false: closing a drawer is a pull. (a) True (b) False
37. 37.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
38. 38.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
39. 39.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet

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