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Physics of Tennis It talks about how tennis games work 

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For the tennis ball when someone hit it goes fast with the energy. Also it show how to play tennis when you hit it. On the tennis ball it shows how it spins when it is hit.

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When observing a tennis match, one may notice that all three of Newton's laws are in action. Newton's first law states that an object at rest stays at rest and an object in motion stays in motion at the same speed, with the same direction unless acted upon by an unbalanced force. Using a tennis racket to strike a tennis ball is a prime example of unbalanced force acting upon an object in motion. Once the ball is struck it flies over the net before being pulled down towards the ground by gravitational pull. If it weren't for gravity's existence, the tennis ball would continue to fly in a straight line forever. Newton's second law suggests that force is equal to mass times acceleration. A serve illustrates the equation that Newton was speaking about. Take the weight of a tennis player's racket and multiply it by the speed at which a player swings their racquet and you will have figured out the total amount of force that was exerted by the tennis racket onto the ball. Newton's third law suggested that for every action there is an equal and opposite reaction. Whenever a tennis player strikes a ball the force of the racquet striking the ball and the force of the ball striking the racquet both act upon each other.

Similar to what I talked about in my blog focusing on the physics of hitting a baseball with a bat, tennis racquets also have sweet spots. The sweet spot is the spot on the racquet that when hit feels the smoothest on the player's hands. Also similar to what we talked about regarding baseball, when a tennis player strikes a ball far from the sweet spot the player experiences an uncomfortable vibration that runs through his racquet and onto his hands. During a serve, kinetic energy is stored in the form of motion as the ball travels through the air. For this reason, players are capable of serving their hardest when they strike their serve at its peak when tossed up in the air. This maximizes the use of gravitation potential energy, or the energy stored in the form of height. Most tennis players attempt to use different forms of topspin, backspin, and sidespin when they hit their shots. The friction between the ball and the racquet's strings is responsible for causing the ball to spin forward. (1) Professional tennis players often slide their racquets over the ball to put topspin on their shots. On the contrary, players are capable of putting backspin on their shots by performing a slicing motion.

1) http://www.unc.edu/~sheng1/spin.htm

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When observing a tennis match, one may notice that all three of Newton's laws are in action. Newton's first law states that an object at rest stays at rest and an object in motion stays in motion at the same speed, with the same direction unless acted upon by an unbalanced force.

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This video explains Newton's 2nd law. It shows that when you apply less force to something less acceleration is produced. If you apply a lot of force then there is a lot of acceleration produced. This is because Newton's Second law states that the rate of change of momentum of an object is directly proportional to the unbalanced force in the direction of force.

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Newton's Second Law of Motion | #aumsum #kids #science #education #children

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if a baseball player throws a ball by forus to throw that hard for a baseball player to throw

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I choses this video because its a boy hitting the ball harder and harder and it shows how fast the ball goes when he hits it.

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Boy Hits Foul and Pitched Ball With Baseball Bat at the Same Time - 1128935 - 1128935

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Crash Test Dummy Video - Newton's 2nd Law

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Crash Test Dummy Video - Newton's 2nd Law

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Forces, motion and acceleration shown in crash testing of a vehicle.

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Forces and Motion   The Physics of Car Crashes (preview)

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George Springer 1000fps Baseball Swing in Slow Motion 

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this is a good example because he put a lot of force in hitting the baseball and it is in slow motion

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George Springer 1000fps Baseball Swing in Slow Motion

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This is breaking down Newton's 2nd Law and putting it in a formula. - Emree Fast

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Newton's first law of motion predicts the behavior of objects for which all existing forces are balanced. The first law - sometimes referred to as the law of inertia - states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s. Objects at equilibrium (the condition in which all forces balance) will not accelerate. According to Newton, an object will only accelerate if there is a net or unbalanced force acting upon it. The presence of an unbalanced force will accelerate an object - changing its speed, its direction, or both its speed and direction.

Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.

The BIG Equation

Newton's second law of motion can be formally stated as follows:

The acceleration of an object as 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 mass of the object.

This verbal statement can be expressed in equation form as follows:

a = Fnet / m

The above equation is often rearranged to a more familiar form as shown below. The net force is equated to the product of the mass times the acceleration.

Fnet = m * a

In this entire discussion, the emphasis has been on the net force. The acceleration is directly proportional to the net force; the net force equals mass times acceleration; the acceleration in the same direction as the net force; an acceleration is produced by a net force. The NET FORCE. It is important to remember this distinction. Do not use the value of merely "any 'ole force" in the above equation. It is the net force that is related to acceleration. As discussed in an earlier lesson, the net force is the vector sum of all the forces. If all the individual forces acting upon an object are known, then the net force can be determined. If necessary, review this principle by returning to the practice questions in Lesson 2.

Consistent with 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 into the above equation, the following unit equivalency can be written.

1 Newton = 1 kg * m/s²

The definition of the standard metric unit of force is stated by the above equation. One Newton is defined as the amount of force required to give a 1-kg mass an acceleration of 1 m/s/s.

Your Turn to Practice

The F net = m * a equation is often used in algebraic problem solving. The table below can be filled by substituting into the equation and solving for the unknown quantity. Try it yourself and then use the click on the buttons to view the answers.

Net Force

(N)

Mass

(kg)

Acceleration

(m/s/s)

1.

10

2

2.

20

2

3.

20

4

4.

2

5

5.

10

10

Newton's Second Law as a Guide to Thinking

The numerical information in the table above demonstrates some important qualitative relationships between force, mass, and acceleration. Comparing the values in rows 1 and 2, it can be seen that a doubling of the net force results in a doubling of the acceleration (if mass is held constant). Similarly, comparing the values in rows 2 and 4 demonstrates that a halving of the net force results in a halving of the acceleration (if mass is held constant). Acceleration is directly proportional to net force.

Furthermore, the qualitative relationship between mass and acceleration can be seen by a comparison of the numerical values in the above table. Observe from rows 2 and 3 that a doubling of the mass results in a halving of the acceleration (if force is held constant). And similarly, rows 4 and 5 show that a halving of the mass results in a doubling of the acceleration (if force is held constant). Acceleration is inversely proportional to mass.

The analysis of the table data illustrates that an equation such as F net = m*a can be a guide to thinking about how a variation in one quantity might affect another quantity. Whatever alteration is made of the net force, the same change will occur with the acceleration. Double, triple or quadruple the net force, and the acceleration will do the same. On the other hand, whatever alteration is made of the mass, the opposite or inverse change will occur with the acceleration. Double, triple or quadruple the mass, and the acceleration will be one-half, one-third or one-fourth its original value.

The Direction of the Net Force and Acceleration

As stated above, the direction of the net force is in the same direction as the acceleration. Thus, if the direction of the acceleration is known, then the direction of the net force is also known. Consider the two oil drop diagrams below for an acceleration of a car. From the diagram, determine the direction of the net force that is acting upon the car. Then click the buttons to view the answers. ( If necessary, review acceleration from the previous unit.)

In conclusion, Newton's second law provides the explanation for the behavior of objects upon which the forces do not balance. The law states that unbalanced forces cause objects to accelerate with an acceleration that is directly proportional to the net force and inversely proportional to the mass.

We Would Like to Suggest ...

Sometimes it isn't enough to just read about it. You have to interact with it! And that's exactly what you do when you use one of The Physics Classroom's Interactives. We would like to suggest that you combine the reading of this page with the use of our Force Interactive. You can find it in the Physics Interactives section of our website. The Force Interactive allows a learner to explore the effect of variations in applied force, net force, mass, and friction upon the acceleration of an object.

Rocket Science!
NASA rockets (and others) accelerate upward off the launch pad as they burn a tremendous amount of fuel. As the fuel is burned and exhausted to propel the rocket, the mass of the rocket changes. As such, the same propulsion force can result in increasing acceleration values over time. Use the Rocket Science widget below to explore this effect.

Check Your Understanding

1. Determine the accelerations that result when a 12-N net force is applied to a 3-kg object and then to a 6-kg object.

2. A net force of 15 N is exerted on an encyclopedia to cause it to accelerate at a rate of 5 m/s ². Determine the mass of the encyclopedia.

3. Suppose that a sled is accelerating at a rate of 2 m/s ². If the net force is tripled and the mass is doubled, then what is the new acceleration of the sled?

4. Suppose that a sled is accelerating at a rate of 2 m/s ². If the net force is tripled and the mass is halved, then what is the new acceleration of the sled?

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Newton's second law describes the affect of net force and mass upon the acceleration of an object. Often expressed as the equation a = Fnet/m (or rearranged to Fnet=m*a), the equation is probably the most important equation in all of Mechanics.

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This video explains Newton's 2nd law and Force,Mass,and Acceleration Formula

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How To Hit A Baseball (BEGINNER'S GUIDE TO HITTING)

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How To Hit A Baseball (BEGINNER'S GUIDE TO HITTING)

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I put this because it shows a guy teacher people how to correctly hit a ball and that would be the motion the guy hitting the ball harder and harder. Then he teaches how to directly throw and catch a ball and all that movement would be going back to kinetic and potential energy. All that energy is made into something called baseball and during all the games there is a lot of energy being used. -Julianna Martin

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If the soccer player kicks the ball the forces causes acceleration of the ball.

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in this video this makes newtons 2nd law a bit more easier to understand

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Newton's Second Law of Motion 🏈 [Science of NFL Football]

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This is a great example on how Newtons 2nd law works. A pitchers pitches the ball and the ball stays in motion. The batter swings his bat and has that force that makes it go fast/Acceleration. The bat is the slingshot that made the chapstick go, and if we had a bigger/heavier object they would not go as fast and probably not as far. This video is the perfect example on Sir Isaac Newtons 2nd Law.

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This video shows the relation between force, mass and acceleration. The video shows examples of how acceleration will be different depending on changes of force and mass. The formula is also shown.