Calculate force of friction on car as it rolls across

[SelenaT]

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

 

[billy_joule]

The problem statement is incomplete. Please copy the entire question word for word.

Your working implies you have more information than you've posted...

 

[SelenaT]

The problem statement is incomplete. Please copy the entire question word for word.

Your working implies you have more information than you've posted...

Will remember to add background of the question.

"Calculate the force of friction on your car as it rolls across a smooth level surface."

Not sure why it says smooth level surface since there was friction between the car and the floor but...

This is a follow up question to an experiment we did. We had to make a mousetrap car so the car was powered only by the mousetrap. The mass of my car is 0.293kg and it traveled 8.7 m in 3.66 seconds across a flat floor.

 

[billy_joule]

Ok. The missing information is that the car comes to a stop after traveling the 8.7 metres.

What you've done is correct.

 

[haruspex]

Will remember to add background of the question.

"Calculate the force of friction on your car as it rolls across a smooth level surface."

Not sure why it says smooth level surface since there was friction between the car and the floor but...

This is a follow up question to an experiment we did. We had to make a mousetrap car so the car was powered only by the mousetrap. The mass of my car is 0.293kg and it traveled 8.7 m in 3.66 seconds across a flat floor.

Are the distance and time measured from a point where the mousetrap has ceased to supply any power?

 

[SelenaT]

Are the distance and time measured from a point where the mousetrap has ceased to supply any power?

yes

 

[haruspex]

yes

Ok