Table of contents

0. Math Review31m
- Math Review
  31m
1. Intro to Physics Units1h 29m
2. 1D Motion / Kinematics3h 56m
3. Vectors2h 43m
4. 2D Kinematics1h 42m
5. Projectile Motion3h 6m
6. Intro to Forces (Dynamics)3h 22m
7. Friction, Inclines, Systems2h 44m
8. Centripetal Forces & Gravitation7h 26m
9. Work & Energy1h 59m
10. Conservation of Energy2h 54m
11. Momentum & Impulse3h 40m
12. Rotational Kinematics2h 59m
13. Rotational Inertia & Energy7h 4m
14. Torque & Rotational Dynamics2h 5m
15. Rotational Equilibrium3h 39m
16. Angular Momentum3h 6m
17. Periodic Motion2h 9m
18. Waves & Sound3h 40m
19. Fluid Mechanics4h 27m
20. Heat and Temperature3h 7m
21. Kinetic Theory of Ideal Gases1h 50m
22. The First Law of Thermodynamics1h 26m
23. The Second Law of Thermodynamics3h 11m
24. Electric Force & Field; Gauss' Law3h 42m
25. Electric Potential1h 51m
26. Capacitors & Dielectrics2h 2m
27. Resistors & DC Circuits3h 8m
28. Magnetic Fields and Forces2h 23m
29. Sources of Magnetic Field2h 30m
30. Induction and Inductance3h 38m
31. Alternating Current2h 37m
32. Electromagnetic Waves2h 14m
33. Geometric Optics2h 57m
34. Wave Optics1h 15m
35. Special Relativity2h 10m

19. Fluid Mechanics

Buoyancy & Buoyant Force

Physics

19. Fluid Mechanics

Buoyancy & Buoyant Force

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Multiple Choice

What causes a water strider to be able to walk on water?

The water strider uses its wings to generate lift and stay above water.

The buoyant force acting on the water strider is greater than its weight.

The surface tension of water provides enough support for the water strider's weight.

The water strider has a special type of lightweight body that floats on water.

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Verified step by step guidance

Understand the concept of surface tension: Surface tension is a physical property of liquids that makes the surface layer behave like a stretched elastic membrane. It is caused by the cohesive forces between liquid molecules.

Recognize the role of surface tension in supporting objects: Surface tension allows certain objects, like a water strider, to remain on the surface of the water without sinking, as long as the object's weight is not enough to break the surface layer.

Identify the water strider's adaptation: Water striders have long, hydrophobic legs that distribute their weight over a larger area, minimizing the pressure on the water surface and preventing them from breaking through.

Consider the balance of forces: The water strider remains on the surface due to the balance between gravitational force pulling it down and the upward force provided by surface tension.

Conclude with the correct explanation: The surface tension of water provides enough support for the water strider's weight, allowing it to walk on water without sinking.