True or False

Question 11 1 pts Normal force includes all components of forces along the horizontal direction. O True O False Question 12 1 pts When an object is pulled up a plane, the normal force is equal to the weight of an object. TrucQuestion 13 1 pts The force that resists or opposes the relative motion of the bodies between two contacting surfaces is called coefficient of friction. O True O False Question 14 1 pts Friction occurs between two contacting surfaces even the two bodies are at rest. O True CaleQuestion 15 Frictional force is directly proportional to the normal force. O True O False