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Float or Sink? Video Lecture | EVS for Class 4 (Our Wondrous World: New NCERT)
FAQs on Float or Sink? Video Lecture - EVS for Class 4 (Our Wondrous World: New NCERT)
| 1. What is the principle behind whether an object floats or sinks in water? |  |
Ans. The principle that determines whether an object floats or sinks is called buoyancy. An object will float if it is less dense than the liquid it is placed in, meaning it displaces a volume of water equal to its weight. Conversely, if the object is denser than water, it will sink.
| 2. How can I determine if a specific object will float or sink? | |
Ans. To determine if an object will float or sink, you can conduct a simple experiment. Fill a container with water and gently place the object in it. If the object remains on the surface, it floats; if it goes underwater, it sinks. Additionally, you can compare the object's density with that of water (1 gram per cubic centimeter) to make predictions.
| 3. What are some common materials that float and sink? | |
Ans. Common materials that float include wood, plastic, and cork, as they are less dense than water. Materials that typically sink include metals like iron and lead, as well as stones, which are denser than water.
| 4. Why do some objects float in saltwater but sink in freshwater? | |
Ans. Saltwater is denser than freshwater due to the dissolved salt. This increased density means that objects that may sink in freshwater could float in saltwater, as they now displace enough water to support their weight.
| 5. How does temperature affect buoyancy and whether an object floats or sinks? | |
Ans. Temperature can affect the density of water; warm water is less dense than cold water. As water warms up, its molecules spread out, which can allow some objects to float that might sink in cooler water. Thus, temperature can indirectly influence buoyancy.
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Sep 07, 2025
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