Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 581 · 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 lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 120 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.Which of these is caused by magnetic force? (a) a compass needle turns (b) lifting a school bag (c) shoes grip the floor (d) brakes stop a bicycle
3. 3.True or false: a knife edge is a wheel and axle. (a) False (b) True
4. 4.🏋️ A force of 500 N pushes a cart 9 m along the floor. How much work is done, in joules?
5. 5.💪 A bag has a mass of 16 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
6. 6.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
8. 8.🪝 A bucket weighing 330 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
9. 9.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) distance from fulcrum (d) mass of fulcrum
10. 10.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
11. 11.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Zoya (330 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
13. 13.⚖️ A seesaw balances. Meena (560 N) sits 2 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 10 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.True or false: a movable pulley halves the effort. (a) False (b) True
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.⚙️ Which simple machine is a steering wheel? (a) inclined plane (b) wedge (c) wheel and axle (d) screw
18. 18.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
19. 19.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot
20. 20.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a nut and bolt (c) a wood screw (d) a jar lid
21. 21.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
22. 22.⚙️ Which simple machine is a truck loading ramp? (a) lever (b) wedge (c) wheel and axle (d) inclined plane
23. 23.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
24. 24.Which of these is caused by gravity? (a) shoes grip the floor (b) a compass needle turns (c) squeezing a lemon (d) rain falls to the ground
25. 25.True or false: opening a drawer is a pull. (a) True (b) False
26. 26.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
27. 27.Which of these is caused by friction? (a) rubbing hands warms them (b) a fridge magnet sticks (c) an apple falls down (d) a river flows downhill
28. 28.True or false: a playground slide is a lever. (a) False (b) True
29. 29.💪 A force is a … (a) push or a pull (b) kind of colour (c) unit of time (d) type of sound
30. 30.🏋️ A force of 420 N pushes a cart 10 m along the floor. How much work is done, in joules?
31. 31.🏋️ A machine lifts a load of 150 N when you push with 30 N. What is its mechanical advantage (MA)?
32. 32.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
33. 33.🪝 A pulley system lifts a 180 N load with an effort of 60 N. What is its mechanical advantage (MA)?
34. 34.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
35. 35.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a kind of wheel (d) a tiny pulley
36. 36.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.Which of these is a wheel and axle? (a) a wheelchair ramp (b) a well-bucket rope wheel (c) a nutcracker (d) a steering wheel
38. 38.💪 A cart is pulled to the right with 25 N and to the left with 35 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
40. 40.🪝 A load of 810 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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