Question

1. a book is sitting on a table. jackie is pushing the book with a force of 9 n to the right. if the force of friction is 4 n to the left, what is the net force?

4 n left
5 n left
4 n right
5 n right

Explanation:

Step1: Define Forces' Directions

Let right - direction forces be positive and left - direction forces be negative. The applied force \(F_{applied}= + 9\space N\) (to the right), and the frictional force \(F_{friction}=- 4\space N\) (to the left).

Step2: Calculate Net Force

The net force \(F_{net}\) is the sum of all forces acting on the object. So \(F_{net}=F_{applied}+F_{friction}\). Substitute the values: \(F_{net}=9\space N+( - 4\space N)=9 - 4=5\space N\). Since the result is positive, the net force is in the right direction.

Answer:

5 N right