# What is the 1st and 2nd law of motion?

## What is the 1st and 2nd law of motion?

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

## Which law says an object wants to move in a straight line?

The Law of Inertia states that moving objects go in a straight line. You must apply a force on an object to make it go in a circular motion.

What does the second law of motion say?

Newton’s second law says that when a constant force acts on a massive body, it causes it to accelerate, i.e., to change its velocity, at a constant rate. In the simplest case, a force applied to an object at rest causes it to accelerate in the direction of the force.

What does Newton’s third law state?

Newton’s Third Law: For every action, there is an equal and opposite reaction. Not all textbooks say that, but if you ask a random person on the street that is likely what they will describe as Newton’s third law.

### What does Newton’s second law states?

Newton’s second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. Acceleration of an object depends on two things, force and mass.

### What are the states of motion?

The state of motion of an object is defined by its velocity – the speed with a direction. Thus, inertia could be redefined as follows: Inertia: tendency of an object to resist changes in its velocity. An object at rest has zero velocity – and (in the absence of an unbalanced force) will remain with a zero velocity.

What happens when an object is moving in straight line?

Constant velocity means that the object in motion is moving in a straight line at a constant speed. This line can be represented algebraically as: x=x0+vt x = x 0 + vt , where x0 represents the position of the object at t=0 , and the slope of the line indicates the object’s speed.

Why do objects want to keep moving in a straight line?

Because of inertia, an object at rest rends to stay at rest. An object in motion tends to keep moving at a constant speed in a straight line.

#### What is the fourth law of motion?

Newton’s Fourth Law or Newton’s Law of Gravitation – Two particles of mass M and m are mutually. attracted with equal and opposite forces F and -F according to the following relationship: ^Mm. -lr.: rz.

#### How do objects move with Newton’s third law?

According to Newton’s third law of motion, forces always act in equal but opposite pairs. Another way of saying this is for every action, there is an equal but opposite reaction. between the forces that objects exert on each other. Newton’s third law can explain how birds fly and rockets move.

How are Newton’s 3 laws related?

Newton’s laws of motion relate an object’s motion to the forces acting on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

What is meant by motion along a straight line?

Linear motion, also called rectilinear motion, is one-dimensional motion along a straight line, and can therefore be described mathematically using only one spatial dimension.

## Can a object not move unless an outside force acts?

-will continue moving at the same velocity unless an outside force acts on it. -will continue moving in a straight line unless an outside force acts on it. -that is not moving will never move unless a force acts on it. -at rest will remain at rest unless acted on by an outside force.

## How are Newton’s three laws of motion related to mechanics?

Newton’s three laws of physics are the basis for mechanics. The first law states that a body at rest will stay at rest until a net external force acts upon it and that a body in motion will remain in motion at a constant velocity until acted on by a net external force. Net external force is the sum of all of the forcing acting on an object.

How does the second law of motion work?

The Second Law of Motion states that if an unbalanced force acts on a body, that body will experience acceleration ( or deceleration), that is, a change of speed. One can say that a body at rest is considered to have zero speed, ( a constant speed). So any force that causes a body to move is an unbalanced force.

What does it mean when an object is in motion?

If you haven’t heard it in the form written above, you have probably heard that “a body in motion stays in motion, and a body at rest stays at rest.” This means that an object that is in motion will not change its velocity unless an unbalanced force acts upon it. This is called uniform motion.