Explain Newton's laws motion.
Answers
What is Newton's First Law of Motion?
Newton's first law of motion states that an object at rest remains at rest and an object in motion remains in motion with the same velocity unless acted upon by what we call an unbalanced force. Let's break this law down by defining some key terms. Velocity is the speed of an object in a specified direction. An unbalanced force is an external force that changes the motion of an object. When an object is at rest or moving at a constant velocity, all the forces acting on it are balanced.
The external force of the hand will move the cup by creating unbalanced forces.
External Force Cup Example
For example, my cup of coffee is resting on my kitchen table as I make this lesson. The force of gravity pulling down is balanced by the force of my kitchen table pushing up on my cup of coffee. Now, if I am to move my coffee, I must apply an external force to disrupt the balance. Thank goodness my muscles are strong enough to apply such a force so I can enjoy my cup of coffee. Ah, now that's good joe! Newton's first law of motion is also referred to as the law of inertia. Inertia is simply the resistance to change in motion. In short, objects tend to keep doing what they are already doing.
Application of Newton's First Law of Motion
There are plenty of applications to Newton's first law of motion. Consider a car moving west along a highway with a constant velocity of 65 miles per hour. What happens when the driver takes his foot off the gas pedal? According to Newton's first law of motion, the car should remain at a velocity of 65 mph, as long as the forces are balanced. As we have witnessed, however, the car slows down, and it comes to rest. This observation begs the question: what external forces act on the car to stop its motion?
The answer is friction. Friction is a force acting in the opposite direction of motion when two objects come into contact with each other. Without external forces, the car would continue to move west at 65 mph. Now, consider a golfer hitting a ball off the tee. While the ball is on the tee, it is said to be at rest. That is, it has no motion. Once the swinging club comes into contact with the ball, the club applies an external force, disrupts the state of balance and sends the ball flying into motion.
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Newton's law of motion:-
1st law:-
Object in motion tends to stay in motion and object at rest tends to stay at rest unless acted upon by an unbalanced force.
2nd law:-
Force equal mass times acceleration(F=MA)
3rd law:-
For every action there is an equal and opposite reaction.