What are the two conditions for weightlessness?

A body with a fixed mass will be weightless under the following conditions: When a body falls freely under the influence of the force of gravity only. When the acceleration of a falling body is equal to the acceleration due to gravity.

What causes weightlessness?

To create the sensation of weightlessness, the pilot sets thrust equal to drag and eliminates lift. At this point, the only unbalanced force acting on the plane is weight, so the plane and its passengers are in free fall. This is what creates the zero-g experience.

What are the effects of weightlessness?

The most significant adverse effects of long-term weightlessness are muscle atrophy (see Reduced muscle mass, strength and performance in space for more information) and deterioration of the skeleton, or spaceflight osteopenia.

What is weightlessness in basic science?

weightlessness, condition experienced while in free-fall, in which the effect of gravity is canceled by the inertial (e.g., centrifugal) force resulting from orbital flight. The term zero gravity is often used to describe such a condition.

How does weightlessness affect the skeletal system?

In prolonged weightlessness, bone mass appears to decrease because the lack of stress on the bones slows the formation of osteoblast cells. Fewer bone-building cells, along with a constant level of bone-destroying activity, translates into a net loss of bone mass.

How does weightlessness affect living organisms?

Significant adverse effects of long-term weightlessness include muscle atrophy and deterioration of the skeleton. Other notable effects include a slowing of cardiovascular system functions, decreased production of red blood cells, balance disorders, eyesight disorders, and changes in the immune system.

What is the weightlessness in physics?

What is weightlessness Class 11 Ncert?

Weightlessness is a condition of free fall, in which the effect of gravity is cancelled by the inertial (e.g., centrifugal) force resulting from orbital flight. There is no force of gravity acting on the objects. It is the condition in which body does not feel its weight at all.

How does weightlessness affect the circulation of blood?

In microgravity the heart changes it shape from an oval (like a water-filled balloon) to a round ball (an air filled balloon), and space causes atrophy of muscles that on Earth work to constrict the blood vessels, so they cannot control blood flow as well.

What do you mean by weightlessness?

Weightlessness is the term used to describe the sensation of complete or almost complete dearth of weight. It can also be defined as the absence of gravity. It is a condition of free fall, in which the effect of gravity is cancelled by the centrifugal force growing from an orbital flight, thus there is no force of gravity acting on the objects.

Is weightlessness dangerous to your health?

The experience during free fall shows that a state of weightlessness lasting only a short time is not dangerous to one’s health. Whether this would be true in the case of long-lasting weightlessness, however, cannot be predicted with certainty because this condition has not been experienced by anyone.

How does weightlessness occur in free fall?

The phenomenon of “weightlessness” occurs when there is no force of support on your body. When your body is effectively in “free fall”, accelerating downward at the acceleration of gravity, then you are not being supported. The sensation of apparent weight comes from the support that you feel from the floor, from the seat, etc.

What is weightlessness in space?

Weightlessness, condition experienced while in free-fall, in which the effect of gravity is canceled by the inertial (e.g., centrifugal) force resulting from orbital flight.