Explanation
Earth cannot be taken as inertial frame because it is revolving around sun as well as rotating about its own axis.
Force of upthrust will be there on mass in shown in figure, so A weighs less than 2 kg. Balance will show sum of load of beaker and reaction of upthrust so it reads more than 5 kg.
According to law of inertia (Newton’s first Law), when cloth is pulled from a table, then cloth come in state of motion but dishes remains stationary due to inertia. Therefore when we pull the cloth from table the dishes remains stationary.
Inertia is the property by virtue of which the body is unable to change by itself not only the state of rest, but also the state of motion.
When a body is moving in a circle, its speed remains same but velocity changes due to change in the direction of motion of body. According to first law of motion, force is required to change the state of a body. As in circular motion the direction of velocity of body is changing so the acceleration cannot he zero. But for a uniform motion acceleration is zero (for rectilinear motion).
In uniform circular motion, the direction of motion changes, therefore velocity changes.
Asp = mv, therefore momentum of a body also change in uniform circular motion.
The purpose of bending is to acquired centripetal force for circular motion. By doing so component of normal reaction will counter balance the centrifugal force.
Work done in moving an object against gravitational force (conservative force) depends only on the initial and final position of the object, not upon the path taken. But gravitational force on the body along the inclined plane is not same as that along the vertical and it varies with the angle of inclination.
In uniform circular motion of a body the speed remains constant but velocity changes as direction of motion changes.
As linear momentum = Mass x Velocity, therefore linear momentum of a body changes in a circle.
On the other hand, if the body is moving uniformly along a straight line then its velocity remains constant and hence acceleration is equal to zero. So force is equal to zero.
An inertial frame of reference is one which has zero acceleration and in which law of inertia hold good i.e., Newton’s law of motion are applicable equally. Since earth is revolving around the sun and earth is rotating about its own axis also, the forces arc acting on the earth and hence there will be acceleration of earth due to these factors. That is why earth cannot be taken as inertial frame of reference.
The apparent weight of a body in an elevator moving with downward acceleration a is given by W = m( g – a).
For uniform motion apparent weight = Actual weight For downward accelerated motion,
Apparent weight < Actual weight
According to third law of motion it is impossible to have a single force out of mutual interaction between two bodies, whether they are moving or at rest. While, Newton’s third law is applicable for all types of forces.
Since, force needed to overcome frictional force.
The coin falls behind him it means the velocity of tram was increasing otherwise the coin fall directly into the hands of thrower.
For upward acceleration apparent weight = m(g + a) If lift suddenly stops during upward motion then apparent weight = m(g — a) because instead of acceleration, we will consider retardation.
In the problem it is given that scale reading initially was 60 kg and due to sudden jerk reading decreasing and finally comes back to the original mark i. e., 60 kg.
So, we can conclude that lift was moving upward with constant speed and suddenly stops.
The fictitious force will act downwards. So the reading of spring balance will increase. In case of physical balance, the fictitious force will act on both the pans, so the equilibrium is not affected.
In the case, one 2 kg wt. on the left will act as the support for the spring balance. Hence, its reading will be 2 kg.
Special theory of relativity is based on two postulates
(i) All laws of physics are the same in all inertial reference frames.
(ii) The speed of light in vacuum has the same value in all inertial frames, regardless of the velocity of the observer or the velocity of source emitting the light.
Particle will move with uniform velocity due to inertia.
Newton’s first law of motion defines the inertia of body. It states that every body has a tendency to remain in its state (either rest or motion) due to its inertia
When a sudden jerk is given to C, and impulsive tension exceeding the breaking tension develops in C first, which breaks before this impulse can reach A as a wave through block.
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