# Physics one-liners for various competitive examinations

## Welcome to the Physics Section page.

## We know the importance of general awareness, GK (General Knowledge) in various competitive exams for aspirants.

## We are publishing general awareness notes and study material on various subjects daily.

## These Physics notes are extremely useful for all exams including Bank Exams.

## Watch Physics One-Liners

### 1- An ammeter is an instrument used to measure electric current.

### 2-The time rate of change of displacement of a body is called its velocity.

### * An object is said to be moving with uniform velocity if it undergoes equal displacements in equal intervals of time.

### * An object is said to be moving with non-uniform or variable velocity if it undergoes unequal displacement in equal intervals of time.

### * Average velocity = Time Displacement/ Total time taken

### * Velocity = Displacement/Time

### 3-The distance covered by a moving body in a unit time interval is called its speed.

### * When a body travels for equal times with speeds v1 and v2, then average speed is the arithmetic mean of the two speeds

### v=v1+v2/2

### * When a body travels equal distances with speed v1 and v2, then average speed is the harmonic mean of the two speeds

2/v= 1/v1+ 1/v2 i.e v= 2v1v2/v1+v2

### *Speed = Distance Travelled/Time taken

### 4-The time rate of change of velocity of a body is called its acceleration.

### * Acceleration at an instant of time is known as instantaneous acceleration.

### * When the velocity of a body increases with time, then its acceleration is positive and if velocity decreases with time, then its acceleration is negative called deceleration or retardation.

### * If acceleration does not change with time, it is said to be constant acceleration.

### * Acceleration = Change in velocity/Time taken

### * It is a vector quantity.

### 5-A large force which acts on a body for a very short interval of time and produces a large change in its momentum is called an impulsive force.

### * Its unit is newton-second.

### 6-Friction is a force which opposes the relative motion of the two bodies when one body actually moves or tries to move over the surface of another body.

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