Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 535 · 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.Which of these is caused by friction? (a) lifting a school bag (b) a thrown ball comes down (c) a magnet picks up pins (d) brakes stop a bicycle
2. 2.🏋️ A force of 50 N pushes a cart 3 m along the floor. How much work is done, in joules?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) on the pivot (d) farther from the pivot
4. 4.True or false: a playground slide is an inclined plane. (a) False (b) True
5. 5.Which of these is a lever? (a) a jar lid (b) a door stopper (c) a water tap handle (d) a nutcracker
6. 6.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
7. 7.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 10 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the load (d) the effort
9. 9.⚖️ A seesaw balances. Arjun (320 N) sits 2 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
11. 11.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
12. 12.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
13. 13.True or false: a movable pulley rises with the load. (a) False (b) True
14. 14.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
15. 15.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) wind (d) magnetism
16. 16.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
17. 17.🪝 A pulley system lifts an 80 N load with an effort of 40 N. What is its mechanical advantage (MA)?
18. 18.🏋️ A force of 40 N did 400 J of work. How many metres did the object move?
19. 19.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
20. 20.⚖️ A seesaw balances. Zoya (480 N) sits 3 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.⚖️ A lever bar balances. The load is 300 N at 30 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
23. 23.⚙️ Which simple machine is a steering wheel? (a) wheel and axle (b) pulley (c) wedge (d) lever
24. 24.True or false: a fishing rod is a class 2 lever (load in the middle). (a) False (b) True
25. 25.⚖️ A lever bar balances. The load is 300 N at 50 cm from the fulcrum. The effort is 500 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
27. 27.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the bar is short (d) the fulcrum moves
28. 28.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 3 (d) 10
29. 29.⚖️ A seesaw balances. Meena (120 N) sits 1 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
31. 31.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the size of the load (d) the direction of pull
32. 32.⚙️ Which simple machine is a well winch handle? (a) wheel and axle (b) pulley (c) lever (d) screw
33. 33.🛞 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, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
34. 34.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Ravi (220 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.⚖️ A seesaw balances. Kabir (680 N) sits 3 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
37. 37.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
39. 39.🏋️ A force of 380 N did 3040 J of work. How many metres did the object move?
40. 40.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction

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