Weight is the force of gravity acting upon the things. Weight is of course related to the mass, but, it has a little bit different definition. As given in the definition it contains only the magnitude thus we say that it is a scalar quantity. Sometimes we use them interchangeably in daily life however, in physics we must be careful while using them. Mass and weight are the most confusing concepts in physics. For this example, our acceleration is 4m/s² to the rightward.Įxample: Given in the picture below, a horse is pulling the horsebox having 8 kg mass in it with a force of 40N if the applied force has an angle of 37º to the horizontal calculate the acceleration of the horsebox.ĭirection of the acceleration is in the direction of Fx which is the net force in direction of motion. So, net force is the only quantity which determines the direction of acceleration. Look at the above example, mass is a scalar quantity, force is a vector quantity. How can we find the direction of acceleration? It is a vector quantity, so it must have a direction beside its magnitude. If the mass is constant, when we increase the force the object gains acceleration with the same amount or, if the force is constant, when we decrease the mass acceleration increases with the same amount.Įxample: Where, F is the force and its unit is Newton, m is mass and has the unit kg and a is the acceleration has unit m/s².įind the acceleration of the block given in the picture below. Now it is time to combine them.įorce is linearly proportional to the mass and acceleration. Thus, we find another relation of force which is Bigger the mass results in bigger the force. All you experience this in your daily life. If the box is full, then can you push it easily with the same force? The answer is of course “NO”. Well, do you think mass affects the acceleration? Suppose that you push a box that is empty, you can easily push it. We understand the relation between force and acceleration. On the contrary we decrease the force then, acceleration also decreases. In the Picture given above we double the force than the magnitude of acceleration also becomes double. Let’s see it from the given picture below. ![]() If we decrease the net force than acceleration also decreases. If we increase the amount of net force than the acceleration also increases in the same amount. ![]() Thus, we can say that there is a linear relation between the net force acting on the object and acceleration. This change occurs because of the net force. As you remember, acceleration is the rate of change in the velocity of the object. Now, we deal with the relation between force and acceleration. Moreover, we also learned the net force concept in the last section. Newton’s Second Law of Motion: In the previous topics I said that force causes acceleration.
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