# Physics helpWatch

#1
What is a mean force? and its equation
0
2 months ago
#2
Force = Accelerating x mass
If you push something then you are the force and you have put that much energy into it to push it.
0
2 months ago
#3
so if the force is changing then the mean will be the average value.

if it is changing linearly then the mean will be ( the start force + the end force ) / 2
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2 months ago
#4
moved to physics
0
2 months ago
#5
(Original post by NX3)
What is a mean force? and its equation
Average = Impulse / time.
0
2 months ago
#6
(Original post by NX3)
What is a mean force? and its equation
It really depends on the context of the questions or the info that you have. If you learn calculus, we can use calculus to “define” the average value of the force F(x) over the interval [a, b] as:

---(1)

If you are given how the force varies with time, you can use the integration “definition” as stated in (1), so you need to integrate with respect to time, t.

Or you can use impulse-momentum theorem to find the average force as

J = Fav Δt ---(2)

where J is the impulse of the net force and based on impulse-momentum theorem:

The change in momentum of a particle during a time interval equals the impulse of the net force that acts on the particle during that interval.

If you are given how the force varies with distance, you can use the integration “definition” as stated in (1).

Or you can use the work-energy theorem,

ΔK = Fav Δx ---(3)

where ΔK is the change in kinetic energy.
0
2 months ago
#7
For A level Physics average force means using the equation Force = change in momentum (mv) / change in time (t)
0
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