What Type of Force Does F Represent in the Force-Momentum Equation?

[TT0]

Hello,

In the equation ∆p = F∆t, what does F stand for. I know it stands for force but what type of force? For example is it the force of the collision or the force if the object hits something etc.

Thanks

 

[HallsofIvy]

It is any type of force at all. That equation says that if a force, F, whether a collision force, magnetic force, gravitational force, etc., acts on any object for a time interval of length $\Delta t$, that force will change the objects momentum by $\Delta p= F\Delta t$.

 

[Dale]

The only restriction on F in that equation is that it must be constant over the time interval. There is a calculus-based version of the same formula which can be used for non-constant forces.

 

[HallsofIvy]

Right, thanks. I was thinking of $\Delta p$ and $\Delta t$ as 'infinitesmals'.

 

[PeroK]

Hello,

In the equation ∆p = F∆t, what does F stand for. I know it stands for force but what type of force? For example is it the force of the collision or the force if the object hits something etc.

Thanks

In fact, that's one way to define a force: something that causes a change of momentum. Anything that causes a change of momentum is then, by definition, a force.

 

[TT0]

All right, thanks everyone it has been very helpful!