Newton’s Second Law says that “when a net force acts on an object, that object must accelerate, that is, its speed changes from second to second”. When you kick the ball for the first time, it accelerates, and when the ball starts to slow down to a stop, it’s also accelerating.
There can be several forces acting on an object, and when all these forces are added together, the result is what we call the net force acting on the object.
If the net force is added to zero, the object is not accelerating; therefore, it will move at a constant speed. If the net force is added to a value other than zero, the object is accelerating.
In nature, all forces oppose other forces, such as friction or opposing gravitational forces. Forces can only produce acceleration if they are greater than the total opposing forces.
If a force pushes an object but is matched by friction, the object does not accelerate. Likewise, if a force pushes against gravity but is less than the gravitational force of an object, it does not accelerate.
For example, if a 15 Newton impulse in an object is opposed by a frictional force of 10 Newton, the object accelerates as if pressed by a net frictionless force of 5 Newton.
Newton’s Second Law
Newton’s first law of motion predicts the behavior of objects for which all existing forces are balanced.
The first law (sometimes called the law of inertia) states that if the forces acting on an object are balanced, the acceleration of that object will be 0 m / s / s. Objects in equilibrium (the condition where all forces are balanced) do not accelerate.
According to Newton , an object will only accelerate if there is a liquid or unbalanced force acting on it. The presence of an unbalanced force will accelerate an object, changing its speed, its direction, or its speed and direction.
Newton’s second law of motion
This law refers to the behavior of objects for which not all existing forces are balanced. The second law states that the acceleration of an object depends on two variables: the net force acting on the object and the object’s mass.
The acceleration of an object depends directly on the net force acting on the object and inversely on the object’s mass. As the force acting on an object increases, the object’s acceleration increases.
As an object’s mass increases, the object’s acceleration decreases. Newton’s second law of motion can be formally stated as follows:
“The acceleration of an object produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force and inversely proportional to the object’s mass.”
This verbal statement can be expressed in the form of an equation as follows:
A = fnet / m
The above equation is often rearranged to a more familiar form, as shown below. The net force is equaled to the product of the mass times the acceleration.
fnet = m • a
The emphasis is always on liquid strength. Acceleration is directly proportional to net force. The net force is equal to the mass times the acceleration.
Acceleration in the same direction as the net force is an acceleration produced by a net force. It is the net force that is related to acceleration, the net force is the vector sum of all forces.
If all the individual forces acting on an object are known, the resulting force can be determined.
According to the above equation, a unit of force is equal to a unit of mass times a unit of acceleration.
By substituting standard metric units for force, mass, and acceleration in the previous equation, the following unit equivalence can be written.
1 Newton = 1 kg • m / s2
The definition of the default metric force unit is indicated by the equation above. A Newton is defined as the amount of force required to provide a mass of 1 kg and an acceleration of 1 m / s / s.
Magnitude and Equation
According to Newton’s Second Law, when an object accelerates, there must be a net force acting on it. On the contrary, if a liquid force acts on an object, that object will accelerate.
The magnitude of the net force acting on an object is equal to the object’s mass times the object’s acceleration, as shown in the following formula:
A net force is the remaining force that produces any acceleration of an object when all opposing forces have been canceled out.
The opposing forces lessen the effect of acceleration by decreasing the net force of acceleration acting on an object.
If the net force acting on an object is zero, the object is not accelerating and is in a state we call equilibrium.
When an object is in balance, two things can be true: either the object is not moving, or the object is moving at a constant speed. The formula for the balance is shown below:
Consider a hypothetical situation in space. You’re taking a spacewalk and fixing something on your raft. While working on the subject with a wrench, he gets angry and throws the wrench away, what happens?
Once the key leaves your hand, it continues to move at the same speed as you released it. This is an example of a net zero force situation. The key will move with the same speed and will not accelerate in space.
If he drops the same key to Earth, the key will fall to the ground and finally stop. Why did you stop? There is a net force that acts on the key, causing it to slow down and stop.
In another example, let’s say you’re on an ice rink. Take a hockey puck and slide it across the ice.
Eventually, the hockey puck slows down and stops, even on smooth, slippery ice. This is another example of a situation with a net force other than zero.