Podcast
Podcast
Podcast
Something went wrong
Questions and Answers
Questions and Answers
What type of force keeps two solid surfaces apart when you push your armchair away from the table?
What type of force keeps two solid surfaces apart when you push your armchair away from the table?
- Magnetic force
- Friction (correct)
- Gravitational force
- Electrical force
What is responsible for making objects fall from great heights due to gravity?
What is responsible for making objects fall from great heights due to gravity?
- Frictional force
- Lift
- Gravitational force (correct)
- Magnetic force
Which type of pressure is related to the weight of the atmosphere pressing down on us?
Which type of pressure is related to the weight of the atmosphere pressing down on us?
- Air pressure
- Ocean pressure
- Atmospheric pressure (correct)
- Hydrostatic pressure
In the physical world, what force is responsible for airplanes flying through clouds?
In the physical world, what force is responsible for airplanes flying through clouds?
What kind of pressure does water create by itself without any help?
What kind of pressure does water create by itself without any help?
What is the unit commonly used to measure pressure in physics?
What is the unit commonly used to measure pressure in physics?
When you sit down on a chair, what force is responsible for keeping it in place?
When you sit down on a chair, what force is responsible for keeping it in place?
Which law of motion states that an object will continue moving unless acted upon by another force?
Which law of motion states that an object will continue moving unless acted upon by another force?
What happens when friction occurs between two materials?
What happens when friction occurs between two materials?
What is the force that pulls things towards each other?
What is the force that pulls things towards each other?
What does Newton's third law say about objects hitting each other?
What does Newton's third law say about objects hitting each other?
When objects move in circles, what kind of force is involved?
When objects move in circles, what kind of force is involved?
Questions and Answers
Something went wrong
Flashcards
Flashcards are hidden until you start studying
Flashcards
Something went wrong
Study Notes
Study Notes
Force and Pressure
Force is said to exist when one object exerts influence upon another. In the physical world, forces can cause things like objects falling from great heights due to gravity, airplanes flying through clouds because of lift, or pencils floating in midair with magnetism. Forces are also responsible for making your chair stay where it is while you sit down. When you push your armchair away from the table, you create a force called friction, which keeps the two surfaces apart, so they don’t stick together. This kind of force between solid materials is known as contact force.
Pressure is related to force. Think of it this way: If you had enough people pushing against something on all sides, their combined weight would make it feel heavy. That feeling comes from the pressure they put on it. Just as there are different kinds of forces, such as magnetic force or electrical force, there are three types of pressures:
- Atmospheric pressure: This is the type of pressure we experience every day outside—the weight of the atmosphere pressing down on us. It makes our lungs work harder to get oxygen into them.
- Ocean pressure: Water has its own special kind of pressure deep under the sea, where ocean currents move along.
- Hydrostatic pressure: This is the kind of pressure water creates by itself, without any other help. For example, if you go swimming in the shallow part of a lake, there isn't much hydrostatic pressure around you. But if you dive deeper, the water gets heavier and puts more pressure on everything below.
In physics, these forms of pressure are often measured in units called atmospheres (atms) or pounds per square inch (psi). Atmosphere refers to how many times the normal weight of Earth's atmosphere presses on something; psi means pounds of pressure over a surface area the size of one square inch.
The relationship between force and pressure can be seen from Isaac Newton's Laws of Motion. These laws describe how forces affect motion. They say that:
- An object will continue moving unless acted upon by another force.
- The amount of force needed to change how fast an object moves depends on how big or small it already is.
- The bigger the force on an object, the faster it goes.
Newton's third law also tells us what happens when one object hits another hard. According to his second law, both objects need a lot of force to keep going at their new speeds. So after hitting each other, they both lose speed until they come to rest again—this process is called deceleration.
One specific form of force is friction. As mentioned before, this force always acts opposite to the direction of movement. Friction occurs when one material rubs against another, causing heat energy to be released. Another kind of force is gravity, which pulls things towards each other. There is even centripetal force involved when objects move in circles. All these various types of forces play important roles in everyday life, helping us understand why things happen the way they do.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Study Notes
Something went wrong
