# In which state a body has zero speed?

A body has zero speed when it has zero distance covered in an interval of time and hence the body is at rest. Was this answer helpful?

## What is the name of class 9 Physics Chapter 1?

Motion is defined as the movement of an object from one place to another. When an object moves along a straight line, the motion is known as rectilinear motion.

## What is motion in physics class 9?

Motion is a change in position of an object over time. Motion is described in terms of displacement, distance, velocity, acceleration, time and speed.

## What is distance class 9?

Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.

## What is velocity in physics class 9?

Velocity is a vector quantity that refers to the rate at which an object changes its position. It is a vector expression of the displacement that an object or particle undergoes with respect to time. The SI unit of velocity is meter/second.

## Why do we fall ill?

Answer: This is because the immune system of our body is normally fighting off microbes. Our body have cells that are specialised in killing infecting microbes. Whenever any microbes or foreign body enters our system, these cells become active and kill the microbes that could cause any damage to the body.

## What is rest physics?

Rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time. Motion: An object is said to be in motion if the position changes with respect to it surrounding and time.

## What are the 7 types of motion?

• Oscillatory Motion.
• Rotational Motion.
• Translational Motion.
• Periodic Motion.
• Circular Motion.
• Linear Motion.
• Uniform Motion.
• Non-Uniform Motion.

## What is the 4 types of motion?

• linear.
• rotary.
• reciprocating.
• oscillating.

## What are the 3 types of motion?

According to the nature of the movement, motion is classified into three types as follows: Linear Motion. Rotary Motion. Oscillatory Motion.

## What is SI unit of distance?

The SI unit of distance is metre. Q. The SI unit for both distance and displacement is metre.

## What is SI unit displacement?

The standard unit of displacement in the International System of Units (SI) is the meter (m). Displacement is usually measured or defined along a straight line. For example, we might speak of the distance between the center of the earth and an orbiting satellite , and measure it as 13,000,000 meters.

## What is SI unit of velocity?

The SI unit of velocity is metres per second (m/s). Alternatively, the velocity magnitude can also be expressed in centimetres per second (cm/s).

## Which is unit of force?

The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg.

## What is the SI unit of speed?

The SI unit of speed is given in terms of basic units of distance and time. Thus, the SI unit of speed is metre per second or m/s.

## What does disease look like?

Note: Disease can be viewed by examining symptoms of disease. The common symptoms of diseases include headache, fever, vomiting etc. Like jaundice can be examined by pale skin. Diarrhoea can be examined by loose motions.

## What is difference between health and disease?

Hint: Health is defined as an individual’s mental, physical, and psychological well-being. The disease is defined as the abnormal dysfunctioning of the mental-physical states, which results in illness in a specific individual and does not take into account society or community.

## What is vaccination Class 9?

Vaccination is the injection of a dead or weakened organism that forms immunity against that organism in the body. Immunization is the process by which an animal or a person stays protected from diseases.

## What is uniform velocity?

Definition of Uniform velocity – A body when covers an equal distance with an equal interval of time, this condition of the velocity is known as uniform velocity. Or, we can say that when the direction and magnitude of speed of a body do not change with time, then the body is said to be at uniform velocity.

## What is random motion?

Random motion is defined as the motion of an object with no specific path. It is a type of motion in which the direction and speed of an object change continuously.

## What is called motion?

motion, in physics, change with time of the position or orientation of a body. Motion along a line or a curve is called translation. Motion that changes the orientation of a body is called rotation.

## What are the types of force?

• Applied Force.
• Gravitational Force.
• Normal Force.
• Frictional Force.
• Air Resistance Force.
• Tension Force.
• Spring Force.

## What is difference between speed and velocity?

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object’s movement. Put another way, speed is a scalar value, while velocity is a vector.

## What is the formula for movement?

Newton’s second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass, F = ma, is the basic equation of motion in classical mechanics.