How can you find force when given velocity and mass?

Answer 1

In its most basic form in Newtonian mechanics, a force acting on a particle is the time rate of change of the linear momentum of the particle it produces. Thus, just knowing the mass of an object, you can never ascertain the magnitude and/or the direction of the force on the particle. You need to know its environment- the agency exerting force on the particle. Further, the effect of the force on the particle must also be known.

Answer 2

If the velocity is constant the force is zero.

By the relation F=ma

where a is accleration. If the accleration is zero then F is also zero.

If you have mass and velocity .

you multiply it and get momentum

If you are given mass and velocity (initial and final) in a frictionless vacuum and want to find out how much force is experienced when it hits another mass you can take the average acceleration over a period of time and multiply it by the mass.

for example in a frictionless vacuum if you have a 5kg Bowling ball (A) with an initial velocity of 10m/s run into another 5kg bowling ball (B) that is stopped. Once ball A collides with ball B it will itself become stopped (the same would be true for ball A running into a wall. assuming no elasticity).

Therefor, ball A went from 10m/s to 0m/s over the period of one second (you can use any amount of time you want but 1 second is the easiest in this scenario). At t=0 ball A's velocity was 10m/s and at t=1 ball A's velocity is 0. 1 / (the final time (1) - the initial time (0)) * (the final velocity (0) - the initial velocity (10)). The acceleration is equal to 10 meters/second per 1 (the amount of we used) or 10m/(s^2). This times the mass of ball A equals -50 kgm/(s^2) ball B experienced the opposite force 50kgm/(s^2).

Answer 3

You also need acceleration. Force = mass x acceleration. Mass needs to be in kilograms and acceleration needs to be in meters per second squared.