Newton's Three Law of Motion (Physics)

Examples (Acceleration)

When a person pushes down the gas pedal, the car has positive acceleration. When the brakes are applied over a period of time, the vehicle accelerates in the negative direction. Another example is throwing a football. It travels in the direction of the line of action of a throw's force at a speed that's inversely proportional to the football's mass and directly proportional to the force.

Examples (Interaction)

3rd law applies to driving because when you drive the action force is the pushing against the road and the reaction is the road pushing against the tires. Also when a car hits a person, the person hits the car. When a car hits telephone pole the pole hits the car. When a car hits a wall the wall hits the car. Another example of Newton's 3rd law would be that when a person's foot pushes the gas pedal, the gas pedal pushes the person's foot.

6. Which of the following statements are true of the concept of force? List all that apply.

A force is a push or pull exerted upon an object which results from the interaction of that object with its environment. Bubba approaches Billie and gives him a swift shove. Timid little Billie keeps his hands in his pocket during this interaction. Subsequently, while Bubba places a force upon Billie, Billie does not place a force upon Bubba. A quarterback throws a football down field. Once thrown, the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak. A sled slides down the hill and reaches the bottom where it gradually slows to a stop. Once on the level ground, the force of the hill persists upon the sled to allow it to continue its forward motion. Forces always cause objects to move. An object can experience two or more forces and not accelerate. A contact force results from the physical contact between two objects. A field force results from the action of two objects which are positioned some distance away. Spring and tension forces are examples of field forces. A force is a vector quantity; there is always a direction associated with it. Force can be measured in kilograms or Newtons depending upon the system of measurement (metric or otherwise).

Questions!!

ANSWERS~!

Second Law - Law of Acceleration

Acceleration, in physics, is the rate at which the velocity of an object changes over time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law.

Which of the following statements are true of an object that experiences balanced forces (or unbalanced forces)? List all that apply.

If a person is moving to the right, then the forces acting upon it are NOT balanced. A balance of forces is demonstrated by an object which is slowing to a stop. It would take an unbalanced force to keep an object in motion. If an object is moving with a constant speed in a circle, then the forces acting upon the object are balanced. If an object is accelerating at a constant rate of acceleration, then the forces acting upon the object are balanced. It is NOT possible for just three forces to be acting upon an object and they still balance each other. A free-falling object experiences a balance of forces. Balanced forces cause stationary objects to remain at rest and moving objects to come to rest. Unbalanced forces cause objects to move.

Examples (Inertia)

If you are in a car, moving at 100km/h you are also moving at 100km/h and lets say the driver suddenly applies the brake,you will slide forward and then slam back into the seat.....right?.......this because the car stops but you continue moving.......how?........because the brakes are applied to the car not you......that's why you should always put on your seatbelt.

1. Which of the following statements are true of inertia? List all that apply.

Inertia is a force. Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity. Inertia is a force which brings all objects to a rest position. All objects have inertia. A more massive object has more inertia than a less massive object. Fast-moving objects have more inertia than slow-moving objects. An object would not have any inertia in a gravity-free environment (if there is such a place). Inertia is the tendency of all objects to resist motion and ultimately stop. In a gravity-free environment (should there be one), a person with a lot of inertia would have the same ability to make a turn as a person with a small amount of inertia.

First Law - Law of Inertia

Inertia is the resistance of any physical object to any change in its state of motion, including changes to its speed and direction. It is the tendency of objects to keep moving in a straight line at constant velocity.

Third Law - Law of Interaction

Interaction is a kind of action that occurs as two or more objects have an effect upon one another. The idea of a two-way effect is essential in the concept of interaction, as opposed to a one-way causal effect. A closely related term is interconnectivity, which deals with the interactions of interactions within systems: combinations of many simple interactions can lead to surprising emergent phenomena. Interaction has different tailored meanings in various sciences.

5. Consider Newton's first law of motion to determine which of the following statements are true? List all that apply.

Newton's first law of motion is applicable to both moving and nonmoving objects. If a football is moving upwards and rightwards towards the peak of its trajectory, then there are both rightwards and upwards forces acting upon it. It would take an unbalanced force to keep an object in motion. If an object is at rest, then there are no forces acting upon the object. It would take an unbalanced force to keep an object in motion at a constant velocity. It is the natural tendency of all objects to eventually come to a rest position. A pendulum bob is set into its usual back-and-forth periodic motion. After some time (perhaps 10 minutes), the pendulum bob comes to a rest position. This is best explained by the idea of inertia - all objects eventually resist motion. If a 3-kg rock is thrown at a speed of 2 m/s in a gravity-free environment (presuming one could be found), then an unbalanced force of 6 N would be required to keep the rock moving at a constant speed. It would take an unbalanced force to cause an object to accelerate from rest.

2. Which of the following statements are true of the quantity mass? List all that apply.

The mass of an object is dependent upon the value of the acceleration of gravity. The standard metric unit of mass is the kilogram. Mass depends on how much stuff is present in an object. The mass of an object is variable and dependent upon its location. An object would have more mass on Mount Everest than the same object in the middle of Lake Michigan. People in Weight Watcher's are really concerned about their mass (they're mass watchers). The mass of an object can be measured in pounds. If all other variables are equal, then an object with a greater mass would have a more difficult time accelerating. If all other variables are equal, then it would require less exerted force to stop a less massive object than to stop a more massive object. The mass of an object is mathematically related to the weight of the object.

3. Which of the following statements are true of the quantity weight? List all that apply.

The weight of an object is dependent upon the value of the acceleration of gravity. Weight refers to a force experienced by an object. The weight of an object would be less on the Moon than on the Earth. A person could reduce their weight significantly by taking an airplane ride to the top of Mount Everest. Two objects of the same mass can weigh differently. To gain weight, one must put on more mass. The weight of an object can be measured in kilograms. The weight of an object is equal to the force of gravity acting upon the object. When a chemistry student places a beaker on a balance and determines it to be 84.3 grams, they have weighed the beaker.