Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 922 · 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.⚖️ A seesaw balances. Asha (600 N) sits 2 m from the pivot on one side; Ravi (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
2. 2.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
3. 3.True or false: a chisel is a wedge. (a) False (b) True
4. 4.Which of these is caused by friction? (a) brakes stop a bicycle (b) an apple falls down (c) rain falls to the ground (d) a fridge magnet sticks
5. 5.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
6. 6.🏋️ A force of 120 N did 240 J of work. How many metres did the object move?
7. 7.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) make new energy (d) use a smaller force
8. 8.💪 A cart is pulled to the right with 55 N and to the left with 45 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
9. 9.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
10. 10.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
11. 11.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 80 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.💪 A box weighs 180 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
13. 13.💪 In a tug of war, one team pulls left with 40 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
14. 14.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
16. 16.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Zoya (110 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
18. 18.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
20. 20.🏋️ A force of 70 N pushes a cart 10 m along the floor. How much work is done, in joules?
21. 21.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
23. 23.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
26. 26.True or false: a tug of war is a push. (a) False (b) True
27. 27.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.Which of these is a lever? (a) a knife edge (b) the tip of a nail (c) a crowbar (d) a playground slide
29. 29.🏋️ A force of 450 N did 4050 J of work. How many metres did the object move?
30. 30.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
31. 31.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
32. 32.Which of these is a screw? (a) a well-bucket rope wheel (b) a crane hook block (c) a window blind cord (d) a screw jack
33. 33.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) less effort needed (d) the load floats
34. 34.Which of these is a wedge? (a) a water tap handle (b) a nutcracker (c) an axe blade (d) a well-bucket rope wheel
35. 35.True or false: a crowbar is a lever. (a) True (b) False
36. 36.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the direction of pull (d) the size of the load
37. 37.⚙️ Which simple machine is a screw jack? (a) pulley (b) wheel and axle (c) inclined plane (d) screw
38. 38.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
39. 39.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
40. 40.🏋️ A 16 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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