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April 20, 2014

April 20, 2014

Posted by **Anna** on Monday, January 27, 2014 at 2:32pm.

(Points : 1)

Impulse is the change in momentum of an object.

Momentum is the change in impulse acting on an object.

Impulse and momentum are always equal in magnitude.

Impulse and momentum are the same thing.

Question 2. 2. Which of these is a statement of the impulse-momentum theorem?

(Points : 1)

F = ma

The impulse is the average force times the time of interaction.

The average force times the time of interaction equals the change in momentum.

Impulse has units of momentum.

Question 3. 3. Which of the following is the equation for impulse?

(Points : 1)

impulse = ma

impulse = mv

impulse = Ft

impulse = p

- Please help with Physics Quickly -
**Damon**, Monday, January 27, 2014 at 3:34pmImpulse is integral F dt , change in momentum

Impulse is average force times time of interaction

Impulse = F t

--------------------------

The way I think about it:

I do not really use

F = m a

I think

F = d/dt(mv) the rate of changer of momentum

(By the way, that works even when you get into special relativity and for objects whose mass is changing like rockets)

If m is constant then indeed

F = m dv/dt which is F = ma

but

my way

F = d (mv) /dt

so

F dt = d (mv) = impulse

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