Dimensions of (force *time ) are same as
Answers
As we all know that, the formula of force can be given as, F=ma
Force equals the mass times acceleration.
And the dimension of mass is mass.
The dimension of acceleration can be shown as velocity per time. Velocity can be shown as the distance per time.
Therefore, Mass, Time Distance, are easy to measure for us, so these are the basic dimensions we like to use.
Then, the dimension of force is Mass, Time, Distance per Time.
The other measurement systems like to say that force is the basic measurement, and that mass is derived from the force.
Why is a Gravitational Force Always Towards the Centre?
A force that purely depends only on the distance from the source has spherical symmetry. It means it will be the same on the surface of the sphere with that distance being the radius. As various bodies get attracted by the likewise force, they will fall towards the centre directly and equilibrate, if not they will be obstructed by the other forces (including their structural integrity), into a spherical shape.
One force, which is a non-radial direction-dependent is that of a magnetic field on a charged particle in motion. The same particle will follow a fixed helical path in general with the field direction (the plane of rotation, which is perpendicular to the field), never to move towards or away from the centre.
A central force is a type of force that points from the particle towards (away from) a fixed point the centre directly, in space, and whose magnitude depends only on the distance of the object to the centre.
Consider the central force which acts along the line joining the object to the centre. The representation can be given as follows.