- Mass and Weight
- What property of an object determines how much inertia the object has?
- How Newton's Laws of Motion Work
Mass and Weight
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Mass is a property of any physical object, from components of atoms to entire planets or stars. While it is related to weight, it is not the same thing, because weight is dependent on other objects in the system, while mass is not for example, you have a different weight on the moon than on the earth, but you are the same mass in both places. It is difficult to define mass without talking about weight, but another way to think about it is that mass is the measure of an object's resistance to acceleration a change in its state of motion when a force is applied--this can best be understood by thinking of pushing on a massive object, like a refrigerator, compared to pushing on something smaller, like a book. Even in a situation without gravity astronauts on a spacewalk , a massive object will still be harder to accelerate than a small object an astronaut will have to apply more force to a bowling ball to accelerate it to 10 mph than to a tennis ball. The larger the mass, the more resistant to changing its state of motion which is also why a large truck uses much more gasoline than a small car. Mass also determines the strength of its mutual gravitational attraction to other bodies you may not realize that you are attracting the earth towards you, just like the earth is attracting you towards it--you are attracting the earth towards you, but the earth is so much more massive than you that all we can notice is you being pulled towards the earth, not vice-versa.
Inertia of an object is the resistance offered by the object to change in its motion or position. The inertia is directly proportional to the mass of the object or to the velocity if the object is in motion. According to Newton's first law of motion, an object not subjected to any net external force moves at constant velocity and will continue to do so until some force causes its speed or direction to change. Similarly, an object that is not in motion will remain at rest until some force causes it to move. Multiply the mass of the object with the acceleration of the object to get the translational inertia.
Sir Isaac Newton first discovered the physical principles underlying the relationship between mass and matter in the late s. Today, mass is considered to be a fundamental property of matter. The kilogram is the standard unit of measurement for mass. While mass is measured in kilograms, a unit that is also used for weight, there is a difference between mass and weight. For example, even if your mass remains constant, your weight on Earth is six times greater than your weight would be on the moon, which has a weaker gravitational pull. According to the first law, without the intervention of an external force, objects in motion will continue to move at the same speed in a straight line.
The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. Definitions of mass often seem circular because it is such a fundamental quantity that it is hard to define in terms of something else. All mechanical quantities can be defined in terms of mass, length, and time.
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The "forever" part is difficult to swallow sometimes. But imagine that you have three ramps set up as shown below. Also imagine that the ramps are infinitely long and infinitely smooth. You let a marble roll down the first ramp, which is set at a slight incline. The marble speeds up on its way down the ramp.
Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed , or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them. Inertia comes from the Latin word, iners , meaning idle, sluggish. Inertia is one of the primary manifestations of mass , which is a quantitative property of physical systems.
Mass is both a property of a physical body and a measure of its resistance to acceleration a change in its state of motion when a net force is applied. The basic SI unit of mass is the kilogram kg. In physics , mass is not the same as weight , even though mass is often determined by measuring the object's weight using a spring scale , rather than balance scale comparing it directly with known masses. An object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. This is because weight is a force, while mass is the property that along with gravity determines the strength of this force.
What property of an object determines how much inertia the object has?
How Newton's Laws of Motion Work
Experience suggests that an object at rest will remain at rest if left alone, and that an object in motion tends to slow down and stop unless some effort is made to keep it moving. We will define net external force in the next section. An object sliding across a table or floor slows down due to the net force of friction acting on the object. If friction disappeared, would the object still slow down? The idea of cause and effect is crucial in accurately describing what happens in various situations. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt.
Inertia is the reason why objects that are not moving or are moving at a constant speed along a straight line have a zero acceleration. A truck is transposrting a huge stone. While the truck is in motion, the stone is also in motion. A deer suddenly jumps into the road and the driver slams the breaks. The truck stops but the stone moves forward because the stone, that is in motion, fights to stay in motion. Link to image above.
Inertia is the resistance of any physical object to any change in its state of motion. The velocity of an object will determine the inertia that the object has. The answr to your question is, the mass on an object. Inertia or mass is a property of matter that determines how much it is affected by gravity. It is the tendency of matter to either remain at rest if at rest, or to continue its uniform motion unless acted upon by an external force. You have to factor in a bunch of smaller things too, but those don't really have much effect. And mass.