Newtons First Law What are Forces Forces are the result of the interaction

# Newtons first law what are forces forces are the

This preview shows page 6 - 10 out of 19 pages.

Newton’s First LawWhat are Forces?Forces are the result of the interaction between bodies. Insimple words, a force is the push or pull acting on an object. For example, you exert a force on a rope to pull an object, and the rope pulls the object.Here, we need a transition between the definition of forces and Newton’s Laws. We also need a couple of examples of how to draw a force diagram.The Law of Inertia
Newton's first law of motion explains the relation between the force applied on an object and its motion.The law states that:An object continues to remain in a state of rest or of uniform motion in a straight line unless compelled by an external force to act otherwise.This means that an object prefers to remain in a state of rest or uniform motion; in order to change the state it's in youneed to apply force to it. Further, an object will always resist the force applied to it. The property of an object to resist an external force is called inertia, and for this reason, Newton's first law is called the law of inertia.If you slide an object on a smooth floor with a given speed, the distance it moves depends upon the friction between the object and the floor. The smoother the floor, the greater the distance traveled by the object. The object eventually stops because of the external force of friction.A force is required to change the velocity of a body. To
understand this statement first recall from your study of kinematics that velocity is a vector with a magnitude (speed) and a direction. In the absence of a force, both speed and direction are constant. When a force acts on an object, it changes the speed, direction, or both of the objects.There is no basic difference between an object at rest and anobject in uniform motion; rest and uniform motion are relative terms. An object at rest with respect to one observer may have a uniform velocity with respect to another observer.Newton’s Second and Third Laws (1 of 2)Newton's Second LawNewton second law states that:The acceleration of an object is proportional to the applied force and takes place in the direction of the impressed force.
An object may experience a number of forces at any instant; one of them is the gravitational force, which always acts on an object in addition to other forces. The vector sum of all the forces acting on an object at any instant is known as the net force.According to Newton's second law, acceleration is proportional to the net force acting on an object and takes place in the direction of the net force. Therefore, if the force on an object is doubled, the acceleration will also be doubled.The relation between the force and acceleration of an object depends on the mass of the object; when the mass increases, the same force produces less acceleration.

#### You've reached the end of your free preview.

Want to read all 19 pages?

• Spring '19
• Tom Pope

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern