Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 84 · 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 force of 190 N did 1900 J of work. How many metres did the object move?
2. 2.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Asha (510 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
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.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
5. 5.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
6. 6.💪 A force is a … (a) unit of time (b) push or a pull (c) kind of colour (d) type of sound
7. 7.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a grippy rubber sole (d) chalk on a gym bar
8. 8.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 200 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
9. 9.⚖️ A seesaw balances. Asha (800 N) sits 1 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 80 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
12. 12.💪 Which can a force NOT do? (a) start it moving (b) change its colour (c) change its shape (d) stop it moving
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
14. 14.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
15. 15.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Meena (510 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.⚖️ A seesaw balances. Ravi (100 N) sits 1 m from the pivot on one side; Zoya (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) a rope on a wheel (d) two ramps back to back
19. 19.⚖️ A seesaw balances. Kabir (390 N) sits 3 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
21. 21.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
22. 22.True or false: a crowbar is a pulley. (a) False (b) True
23. 23.Which of these is caused by friction? (a) an apple falls down (b) squeezing a lemon (c) rubbing hands warms them (d) rain falls to the ground
24. 24.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
25. 25.Which of these is a wheel and axle? (a) a wood screw (b) a steering wheel (c) a nutcracker (d) a door stopper
26. 26.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
27. 27.🏋️ Pushing a crate 3 m took 420 J of work. What force was used, in newtons?
28. 28.💪 Two children push a box to the right, one with 95 N and the other with 80 N. What is the net (total) force on the box, in newtons?
29. 29.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
30. 30.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
31. 31.Which of these is a pulley? (a) a screw jack (b) a crane hook block (c) a claw hammer on a nail (d) a round doorknob
32. 32.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) colour of bar (d) time taken
33. 33.🔍 Which is the odd one out? (a) a crane hook block (b) a road up a hill (c) a wheelchair ramp (d) a playground slide
34. 34.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 150 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.Which of these is a lever? (a) a well-bucket rope wheel (b) a steering wheel (c) a bottle opener (d) a playground slide
36. 36.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 1 (c) class 3
37. 37.🔍 Which is the odd one out? (a) a knife edge (b) a steering wheel (c) a door stopper (d) the tip of a nail
38. 38.💪 Which force is at work: squeezing a lemon? (a) gravity (b) muscular force (c) magnetic force (d) friction
39. 39.True or false: a movable pulley only changes direction. (a) False (b) True
40. 40.🪝 A winch has a wheel of radius 28 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1400 N bucket on the axle, in newtons? (ideal)

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