- #1

SelenaT

- 12

- 0

## Homework Statement

Calculate the force of friction on a toy car as it rolls across a flat floor.

Given:

mass = 0.293kg

time = 3.66 s

displacement = 8.7

## Homework Equations

F

_{net}= mass x acceleration

displacement = [(velocity1 + velocity2)/2] time

velocity2 = velocity1 + acceleration(time)

## The Attempt at a Solution

Step 1[/B]

displacement = [(velocity1 + velocity2)/2] time

v2 = (2d/time) - v1

= 2(8.7m)/3.66s - 0m/s

= 4.75m/s

Step 2

velocity2 = velocity1 + acceleration(time)

a = v2-v1 / time

= 4.75/3.66

= 1.29m/s^2

Step 3

F=ma

= 0.293kg x 1.29m/s^2

= 0.38N

so the force of friction on the car is 0.38N ?

I am unsure if this is right and if i have to use the Force of friction = μ x N equation