Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 229 · 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 pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
2. 2.True or false: a fixed pulley only changes direction. (a) True (b) False
3. 3.⚖️ 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 1 (c) class 3
4. 4.⚖️ A seesaw balances. Zoya (510 N) sits ? m from the pivot on one side; Asha (680 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
5. 5.⚖️ A lever bar balances. The load is 300 N at 20 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.🏋️ Pushing a crate 1 m took 210 J of work. What force was used, in newtons?
7. 7.Which of these is caused by gravity? (a) rain falls to the ground (b) rubbing hands warms them (c) squeezing a lemon (d) a fridge magnet sticks
8. 8.⚖️ A seesaw balances. Zoya (170 N) sits 2 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Kabir (120 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.True or false: a crane hook block is a pulley. (a) False (b) True
11. 11.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
12. 12.🏋️ A force of 60 N pushes a cart 1 m along the floor. How much work is done, in joules?
13. 13.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) an apple falls down (c) squeezing a lemon (d) a compass needle turns
14. 14.True or false: pulling up your socks is a push. (a) False (b) True
15. 15.Which of these is a wheel and axle? (a) a steering wheel (b) a seesaw (c) a door stopper (d) a knife edge
16. 16.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
17. 17.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a rough doormat (d) a wet tiled floor
19. 19.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
20. 20.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
21. 21.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
22. 22.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
23. 23.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Meena (150 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the pulley (d) the load
25. 25.⚙️ Which simple machine is a road up a hill? (a) inclined plane (b) pulley (c) wedge (d) lever
26. 26.💪 A cart is pulled to the right with 35 N and to the left with 30 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
27. 27.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
28. 28.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) both weights are equal (d) the fulcrum moves
29. 29.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
30. 30.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
31. 31.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
32. 32.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
33. 33.🏋️ A force of 400 N did 800 J of work. How many metres did the object move?
34. 34.⚖️ A seesaw balances. Asha (300 N) sits 2 m from the pivot on one side; Ravi (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
36. 36.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
37. 37.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
38. 38.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) gravity (c) unbalanced (d) balanced
39. 39.🪝 A load of 600 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
40. 40.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) magnetic force (c) friction (d) gravity

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