In the absence of ubalanced forces, it is the natrual tendect of an object to____?
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e, because of the Newton's 1st law: "An object at rest will remain at rest unless acted upon by an external and unbalanced force . An object in motion will remain in motion unless acted upon by an external and unbalanced force". Assuming inertial frame of reference.\nThe object can still have angular acceleration if there are two forces cancelling each other but are applied to an object at different points. \n\nIn real life there is always something that will slow down the object even in space.
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This is uniform motion, if it is going in a straight line at constant speed.\n\nIf there are no forces acting upon a body, and therefore no acceleration (remember F=ma) or change in direction, nor any change in angular momentum, the motion is uniform. If it were changing direction, accelerating or going round in circles then it is non uniform.
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d)\notherwise some of work transforms to heat which is potential energy not kinetic.\nfor example when you kick the wall, acting forces are not elastic and do not rise kinetic energy of your feet or wall.
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If all forces are in equilibrium then the object won't move even if there are several forces acting on it.
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Answer is 'acts in the direction opposite of motion."\n\nFriction always opposes motion. Therefore first one is wrong.\nFriction is equal to mu times the weight. and mu is not equal to one.Therefore second  one is wrong.\n Sliding friction is less than static friction\nTherefore Third   one is wrong.
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No. \nThe system is static and the sum of the forces equal zero, but there definately are forces flowing through the bar.  Replace the bar with a piece of plastic and then what happens.  The system is no longer in equilbruim, becomes dynamic and the plastic gets torn to shreads.  The same would be true if say you used a piece of wire.  Just because something is not moving does not mean there are no forces flowing through it.
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Since the piece of cheese is at rest. and no net force is acting. by Newton's First Law of Motion, it would continue in its initial 'state of motion'  which is rest here (since it was initially at rest) ....all other choices would violate the law!. got it dear!
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You mean Newton's 2nd law of motion, don’t you?\n\nForce = mass * acceleration\n\nI like this law, a lot, actually.\nIt may not seem very intuitive at first to someone trying to learn it, but with practice, you'll come to understand.\n\nThe basic concept is that a [net] force applied to an object causes it to accelerate.  When you push on something, it moves.  They key work being a "net" force.  If there is no net force (i.e. F = 0), there is no acceleration.\nThe force the chair is exerting on you, called the "Normal" force is necessary because while you are sitting in the chair are you falling towards the ground?  No, of course not.\n\nWe all know that Earth (gravity) exerts a force on you in the downward direction, called "Weight".  Without a balancing force, you would continue to accelerate downward.  If the chair did not exert a normal force back upward to cancel weight, there would be a net force acting upon you in the downward direction which would cause you to accelerate downward.\n\nA similar case is true for other objects, like when you push on a wall.  In this case, it is not gravity which exerts the force, you are doing it.  In order to keep the wall from accelerating when you push on it, the wall must exert a force back which is "normal" to its surface.  Eventually, however, the wall will not be able to provide ample normal force to counter your push and parts of the wall will begin to accelerate as the wall breaks.
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When the pendulum reaches the 90 degree point in the motion, the force of gravity and the applied force are equal for an infintesimal moment. \n\nThat means there is no "weight" to support. Weight is a function of mass and the force of gravity. Since gravity = 0 relative to the object, then weight = 0
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The net force is 0 Newtons. The force of friction is 100N.\n\nThe key here is that\n1. No acceleration.\n2. Horizontal force only.\n\nThis means that the forces are balanced in the horizontal direction. The object isn't accelerating so net F = ma = 0.
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the inherent property of a body by virtue of which a body at rest remains at rest and a body in motion continues to move in the same direction even after some external force is applied to it is called inertia. newton's first law of motion is the law of inertia. for example an athlete keeps running even after he reaches the finish line because of inertia of motion which will not allow him to stop immediately. \n           momentum,p,can be calculated by the formula \n                  p = mv \n         where m is the mass of the object and  v is the velocity.\n              i think you are a ninth std student and i learnt all that last year!
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Add up one opposite vector (going up). In physics, they call it NORMAL FORCE.
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forces are opposite and equal, otherwise you would change speed/direction.
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opposite force being applied
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A curious result is that if you put a charged object anywhere inside a spherically symmetric charged hollow sphere, the net force on that object is zero.  It doesn't have to be in the centre.  This is a consequence of Gauss' Law.
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Centripucal force.\n\nAlso, what do you think about this:\nhttp://answers.yahoo.com/question/index;_ylt=AmrSFoWDmbBKpjJhzCluBHnsy6IX?qid=1006052000004
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Newton's first law of motion states that "An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force." Objects "tend to keep on doing what they're doing." In fact, it is the natural tendency of objects to resist changes in their state of motion. This tendency to resist changes in their state of motion is described as "inertia".