Question

PHYSICS 1. Why can't you write properly with a chalk on a Glass sheet, show it with a surface diagram. 2. When you are running on a road, you are acted upon by frictional force of the road.Is there another force of friction acting on you? Name and explain. 3. How does the streamlined body of a fish help it in swimming? Explain it by showing of a streamlined body of fish. Plz help urgent​

Answer 1

Explanation:

Functions of the liver

The liver regulates most chemical levels in the blood and excretes a product called bile. This helps carry away waste products from the liver. All the blood leaving the stomach and intestines passes through the liver.

Answer 2

Answer: hope it helps you

1. The surface of glass sheet is smooth, because of the smooth surface of glass the friction becomes less. This means the interlocking if molecules is also less because of the less interlocking of molecule we are unable to write on the glass sheet.

2. Besides the frictional force on the road acting on the body while running there is another kind of friction that acts upon you called drag force. This force counteracts the forward running which means it is in the opposite direction of forward running. Drag force is actually a resistive force acting upon through air which causes deceleration.

        Drag force= 1/2pv²AD

where p is density of fluid, v is velocity, A is area and D is drag coefficient.

3. Fish exhibits locomotion by the process of swimming. Muscles and bones bring about locomotion in fish.  

Mechanism of swimming in fish

The body of the fish is supported by endoskeleton made up of bones.  Fish possess a streamlined body which helps them to swim in water. Fish swim with the help of their fins. Streamlined body helps in orientation of the fish movement  in a particular path.

or

The bodies of fish are the streamlined bodies because they have to move in fluids.  Fluids exerts a force opposite to the direction of motion when an object (Fish) is moving in a fluid. This frictional force is known as drag. In order to decrease this drag the objects are given a special shape or streamlined shape. So it becomes easier for the objects to move in fluids.