Physics help

NX3

Badges: 3

Rep:

#1

Report Thread starter 2 months ago

#1

What is a mean force? and its equation

0

reply

TensorTympani

Badges: 17

Rep:

#2

Report 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

reply

the bear

Badges: 20

Rep:

#3

Report 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

0

reply

entertainmyfaith

Community Assistant

Badges: 21

Rep:

#4

Report 2 months ago

#4

moved to physics

0

reply

RogerOxon

Badges: 21

Rep:

#5

Report 2 months ago

#5

(Original post by NX3)
What is a mean force? and its equation

Average = Impulse / time.

0

reply

Eimmanuel

Community Assistant

Badges: 12

Rep:

#6

Report 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:

${{F}_{av}}=\dfrac{1}{b-a}\int\limits_{a}^{b}{F\left( x \right)dx}$ ---(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 = F_av 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 = F_av Δx ---(3)

where ΔK is the change in kinetic energy.

0

reply

Danbeee

Badges: 5

Rep:

#7

Report 2 months ago

#7

For A level Physics average force means using the equation Force = change in momentum (mv) / change in time (t)

0

reply

Physics help Watch

Quick Reply

Today on TSR

Oops, nobody has posted
in the last few hours.

See more of what you like on
The Student Room

University open days

Poll

Do you give blood?

Watched Threads

Oops, nobody has posted
in the last few hours.

See more of what you like on
The Student Room

TSR Support Team

Get Started

Using TSR

Info

TSR Group

Connect with TSR

Physics help Watch

Quick Reply

Related discussions

Related university courses

Today on TSR

Oops, nobody has postedin the last few hours.

Oops, nobody is replying to posts.

See more of what you like onThe Student Room

University open days

Poll

Do you give blood?

Watched Threads

Spotlight

Oops, nobody has postedin the last few hours.

Oops, nobody is replying to posts.

See more of what you like onThe Student Room

TSR Support Team

Get Started

Using TSR

Info

TSR Group

Connect with TSR

Oops, nobody has posted
in the last few hours.

See more of what you like on
The Student Room

Oops, nobody has posted
in the last few hours.

See more of what you like on
The Student Room