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The acceleration of falling body is uniform acceleration.

Freefall is a special case of motion with constant acceleration because the acceleration due to gravity is always constant and downward. This is true even when an object is thrown upward or has zero velocity. Therefore, the acceleration of a freely falling body is not absolutely uniform, it's rather constant, due to the acceleration due to gravity.

The position of an object with respect of a point can be changed without changing its distance.

Even if the distance of a body doesn't change with respect to a point but the position of the body might change. For example, the distance with respect to the center from a body revolving in a circular path doesn't change. The value of the position vector of the body changes when the direction of the point changes. So, position changes.

Differences between Balanced Force and Unbalanced Force

Differences between Balanced Force and Unbalanced Force.No.Balanced ForceUnbalanced Force1The forces that act on a body and create equilibrium are called balanced force.The forces that act on a body but don't create equilibrium are called unbalanced force. 2In this case, the resultant of the active forces is zero.In this case, the resultant of the active forces is not zero.

Why is walking hard on a muddy road?

We can easily walk on the road due to the frictional force between the road and the bottom of our feet. But the frictional force between the road and the bottom of our feet decreases in muddy roads. This is why we slip on those roads. So, it is hard to walk on muddy roads.

Although the speed of the earth around the sun is a periodic motion but not rotational motion

If the motion of a moving object is such that it passes repeatedly through a definite point in the same direction in the same manner in a definite interval of time, then this motion is called a periodic motion. Earth revolves around the Sun in the same direction in a parabolic path in every 1 year or 365 days, so the motion of Earth is periodic motion. Again, when a body rotates about a particular point or a line, keeping the distance of the particles of the body unchanged, it is called circular motion. Since orbit of Earth is parabolic, so the distance between Earth and Sun isn't always same, this distance is different at different times of the period. So, motion of Earth is not circular motion.

Why the motion of earth around the sun is periodic motion but is not vibratory.

When a body rotates about a particular point or a line, keeping the distance of the particles of the body unchanged, it is called circular motion. Earth revolves around sun as it crosses a specific point at specific time that is why earth's motion is circular motion. Again, Periodic Motion If the motion of a moving object is such that it passes repeteadly through a definite point in the same direction in the same manner is called a periodic motion. However, earth revolves around sun at same direction. Therefore, it is not a periodic motion.

The differences between angiography and angioplasty.

An angiogram is a test to find out which arteries supplying the heart have become narrowed. An angiogram uses X-rays to show 'route maps' of blood vessels and arteries in the heart.On the other hand, angioplasty is a procedure to expand narrow arteries that may follow on from an angiogram.

There is no change in acceleration without change in velocity.

The rate of change of the non-uniform velocity of a body with time is called its acceleration. If the velocity of the body is constant that is, the body travels the same distance for every per unit time, then there will be no change in velocity. So, the velocity will be uniform velocity. Otherwise, the velocity will be non-uniform. As, acceleration depends on velocity and it has meaning only when the velocity is non-uniform, so there is no change in acceleration without a change in velocity.

Explain how even if a bigger distance is covered displacement can be zero.

Distance is the length covered either in a straight or curved line. And distance is the initial and final position's distance drawn in a straight line. So, if an object starts it motion and after covering a distance in a straight or curved line, but at last finishes at its initial point then the initial and final point is one and the same thus its displacement is zero.

The average velocity of a body can be zero, but average speed of a body cannot be zero.

Speed indicates only the rate of change of position with time, it does not indicate the direction of change of position. The velocity states the rate of change of position along with its direction that is, velocity means the rate of change of position in a definite direction or in other words the rate of change of displacement. The average velocity depends on the net displacement of a body so if a body starts from a position and comes back to the same position after some time, the net displacement is zero. Consequently, the average velocity is zero. While the speed depends on the actual path length covered. It can't be zero if a body has displaced from its position.

Explain if the falling mango supports third law

Third law of falling bodies- The distance traversed by a freely falling body from rest in a given time is directly proportional to the square of the time.

Why the value of g is maximum at polar region?

The poles are closer to the center of the Earth due to the equatorial bulge, which strengthens gravitation at the poles and weakens it at the equator. The equatorial bulge modifies how the Earth gravitates. This is why the value of g is maximum in the polar regions.

The acceleration of falling body is uniform - explain.

If the rate of increase of velocity of a moving body in a particular direction constant all the time, then the acceleration is said to be uniform. Due to gravity, the acceleration of a freely falling body is 9.8 ms-2, that is, its velocity increases by 9.8 ms-2 for each successive second.
So, the acceleration of a falling body is uniform.

When does non-uniform acceleration take place?

Non-uniform acceleration takes place when the rate of increase of velocity changes with time.

Explain average speed.

If the magnitude of speed does not change during the motion of the body, the speed of the body is called uniform speed. If a body doesn't travel an equal distance in equal interval of time, the speed is called non-uniform speed. If the body doesn't move with uniform speed, the speed obtained by dividing the total distance traveled by time called average speed.
So, Average speed = total distance / time.

Differences between velocity and speed

Differences between velocity and speed.No.VelocitySpeed1Rate of change of position of an object in a definite direction is called velocity.Rate of change of position of an object in any direction is called speed. 2Velocity is a vector quantity.Speed is a scalar quantity.

Why trees from outside of a moving bus seem moving.

From a moving bus, trees seem moving because of relative velocity. Every observer sees his own structure as non-moving. Passengers of a moving bus will see the bus as a non-moving object but he will think that the trees outside are moving.

What is the motion of simple pendulum oscillatory?

If an object in periodic motion moves in such a way that in half of its time period its motion is in a definite direction and in another half of the time period its direction of motion is opposite but the path is the same then its motion is called oscillatory. A simple pendulum moves in one direction in half of its time period and moves in the same path but in the opposite direction in the second half of the time period. For this reason motion of the simple pendulum is oscillatory.

Why acceleration due to gravity is the example of uniform acceleration?

If the rate of increase of velocity of a moving body in a particular direction is maintained constant all the time, then the acceleration is said to be uniform. An example of uniform acceleration is the gravitational acceleration. Due to gravity, the acceleration of a freely falling body is 9.8 m/s2, that is, its velocity increases by 9.8 m/s for each successive seconds. So, gravitational acceleration is an example of uniform acceleration.

What is random error?

The error for which an irrelevant measurement occurs in a measured result due to the precision limitations of the measuring device is known as a random error. In order to minimize the random error, the average value of frequent measurements has to be taken.

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