107k views
4 votes
When Bella pushes a box with a mass of 5.25 kilograms with a force of 15.75 newtons, it accelerates at a rate of 2.5 meters/second2. What is the force due to friction?

I have no clue whats going on. Can anybody help me please!?!

2 Answers

3 votes

Answer:

-2.60

Step-by-step explanation:

Plato

User Shalamus
by
8.4k points
1 vote

Sure !

Start with Newton's second law of motion:

Net Force = (mass) x (acceleration) .

This formula is so useful, and so easy, that you really
should memorize it.

Now, watch:

The mass of the box is 5.25 kilograms, and the box is
accelerating at the rate of 2.5 m/s² .
What's the net force on the box ?

Net Force = (mass) x (acceleration)

= (5.25 kilograms) x (2.5 m/s²)

Net force = 13.125 newtons .

But hold up, hee haw, whoa ! Wait a second !
Bella is pushing with a force of 15.75 newtons, but the box
is accelerating as if the force on it is only 13.125 newtons.
What happened to the rest of Bella's force ? ?

==> Friction is pushing the box in the opposite direction,
and cancelling some of Bella's force.

How much ?

(Bella's 15.75 newtons) minus (13.125 that the box feels)

= 2.625 newtons backwards, applied by friction.


User Darin Peterson
by
8.9k points

No related questions found