Physics Help? C4:1

Question

A car with a mass of 1100 kg is being pulled by a tow truck.  The tow truck pulls the car to the north with a constant 1200 N force, while a friction force pushes the car towards the south.  Starting from rest, the truck pulls the car 60 meters toward the north in 25 seconds.

 

1)         What is the magnitude of the friction force acting on the car?

Answer 1

Step 1:

A car of mass 1100 kg is being pulled by the a tow truck.

A frictional force pulls the car towards south.

Starting from rest, the car accelerates and moves 60 mts in 25 seconds.

The force acting on the car are shown below :

Total force acting on the car : .

Frictional force :

Step 2:

Find acceleration.

Equation of Motion : .

Initial velocity is zero.

Distance travelled by the car is 60 mts.

Time taken by the car is 25 seconds.

m/sec².

Frictional force :

 

Solution:

Frictional force