Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 741 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
3. 3.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
4. 4.🪝 A pulley system lifts a 180 N load with an effort of 60 N. What is its mechanical advantage (MA)?
5. 5.⚖️ A lever bar balances. The load is 100 N at 30 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
7. 7.🛞 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 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
8. 8.⚙️ Which simple machine is a claw hammer on a nail? (a) wedge (b) lever (c) pulley (d) inclined plane
9. 9.⚙️ Which simple machine is an axe blade? (a) pulley (b) wedge (c) screw (d) inclined plane
10. 10.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
11. 11.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) both weights are equal (d) turning effects match
12. 12.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Kabir (560 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the pulley
14. 14.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
15. 15.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) gravity (d) the colour of rope
16. 16.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) far from the fulcrum (d) near the fulcrum
17. 17.True or false: your forearm is a class 1 lever (fulcrum in the middle). (a) True (b) False
18. 18.Which of these is a pulley? (a) a well-bucket rope wheel (b) a seesaw (c) a crowbar (d) a road up a hill
19. 19.🏋️ A force of 100 N pushes a cart 2 m along the floor. How much work is done, in joules?
20. 20.⚖️ A lever bar balances. The load is 120 N at 10 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.🏋️ Pushing a crate 1 m took 60 J of work. What force was used, in newtons?
22. 22.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
23. 23.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
24. 24.💪 A cart is pulled to the right with 65 N and to the left with 50 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
25. 25.True or false: a truck loading ramp is an inclined plane. (a) False (b) True
26. 26.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
27. 27.💪 Which force is at work: rain falls to the ground? (a) gravity (b) magnetic force (c) friction (d) muscular force
28. 28.💪 Two children push a box to the right, one with 55 N and the other with 65 N. What is the net (total) force on the box, in newtons?
29. 29.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
30. 30.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
31. 31.💪 A cart is pulled to the right with 95 N and to the left with 105 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
32. 32.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
33. 33.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
34. 34.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
36. 36.⚙️ Which simple machine is a wood screw? (a) screw (b) lever (c) wheel and axle (d) pulley
37. 37.🏋️ Pushing a crate 1 m took 200 J of work. What force was used, in newtons?
38. 38.💪 A force is a … (a) kind of colour (b) type of sound (c) unit of time (d) push or a pull
39. 39.💪 Which force is at work: rubbing hands warms them? (a) friction (b) magnetic force (c) muscular force (d) gravity
40. 40.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Meena (330 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?

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