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The downward force acting on the block is

The downward force acting on the block is Correct Answer gravity

Correct option-4

Concept:-

FORCE:-

  • Force is an external cause that is capable of changing the state of rest or motion of a particular object.
  • Force is a vector quantity. So it has both magnitude and direction.
  • The direction along which a force is applied is known as the direction of the force and the point where force is applied is called the application point.
  • Usually, the magnitude of Force is measured by using a spring balance.
  • The SI unit of force is Newton (N).
  • The physical quantity force is quantified by the product of mass (m) with acceleration (a).
  • The force can mathematically be expressed as:-

F = ma

Where,

m = mass
a = acceleration
It is articulated in Newton (N) or Kg m/s2.

Explanation:-

While drawing a free-body diagram of an object we should always keep one thing in our mind is-

Force of gravity is always acting in a downward direction and passes through the centre of mass of the body.

Actually, Force of gravity is a kind of pull exerted by the earth on the body along the direction toward the centre of the earth.

It is also known as weight and denoted by w.

For example-

The direction of gravitational force shown below in the FBD of a book lying rest on the surface of the earth.

FBD (Free-Body Diagram)

  • A free-body diagram is a diagram of a given system that is the one in which we represent all the forces acting on it and thus we calculate the net force.
  • Free-body diagrams are used to show the direction and magnitude of all the forces acting upon an object.
  • The length of the arrow in FBD represents the magnitude of the force and arrows are labeled to indicate the type of force.
  • In these diagrams, the object is generally represented like a box and the arrows representing force are drawn from the center of the object.
  • There is no strict rule on the number of forces that can be drawn in a free-body diagram.
  • For an example of a book placed at rest on the ground, figure (b) is given below.

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