The _____ of all the forces acting on an object gives rise to the net force acting on it.

Multiple forces produce the maximum effect when they are applied directed ___.

A body is under the action of a force of 123 N. What kind of forces are acting on it?

An object subjected to multiple forces did not move at all. The forces are ____.

Two forces acting on an object are in opposite directions to each other. In which direction would the net force point?

When the net force on an object is non-zero, the forces on the object are called ___.

An object subjected to multiple forces moves under the effect of ____.

What is the S.I. unit of force?

Forces directed along the same direction ____ to get the net force.

When the net force on an object is zero, the forces on the object are called _____.

Whose observation is this?

Robert Hooke used a thin slice of cork to observe under microscope and found honeycomb like structure.

The cell theory was made by _________.

Schlieden and Schwann both were German physician and also worked great in botany as well by giving cell theory.

Theodore Schwann was a _____.

• He observed cell as basic unit in animal.
• Worked with Schlieden to introduce cell theory.

Who used this microscope for observing cells?

• The microscope was used by Robert Hooke to introduce cell theory.
• He stated cell as basic unit of plant structure.

Matthias Schleiden was a ______ scientist.

• He belonged to Germany.
• In 1838 , he defined cell as basic unit of plant structure.
• After an year Schwann told that cell is basic unit of animal structure also .
• Both gave cell theory.

The following picture is of__________.

• He said that it seems like cellula or small rooms so named as cell.
• He saw dead cell wall (cork) under microscope.
• He borne on 18th July 1635 & died on 3rd March 1703