Newtons Laws of Motion

According to Newton's second law, F=ma. That is, the bear's acceleration should be proportional to the total force acting on the bear. As the bear's velocity is constant, its acceleration is zero. Therefore, the total Force acting on the bear is zero. Thus, the friction has to be equal in magnitude and opposite in direction to the bear's weight. As W=mg, we get that its weight is 9.8*400=3,920 Newton. Thus, the friction acting on the bear is 3,920 Newton upwards.

The specific gravity for water is 1.

However, when the temperature of water increases, the gravity gradually lowers. At 0°C (32°F), gravity is 1. At 100°C (212°F), the specific gravity of water is 0.958. At 300°C (approx. 580°F), it is 0.7.

Assuming the stone was dropped from rest, we can calculate the height of the bridge using the kinematic equation: h = 0.5 * g * t^2, where h is the height of the bridge, g is the acceleration due to gravity (9.8 m/s^2), and t is the time of fall (2.1 seconds). Plugging in the values, we get h = 0.5 * 9.8 * (2.1)^2 = 22.33 meters. Therefore, the height of the bridge is approximately 22.33 meters.

In Newton's law of universal gravitation, an object's weight is equal to the force of gravity acting on it. This force depends on the mass of the object and the acceleration due to gravity, typically 9.81 m/s^2 on Earth. The weight of an object can be calculated using the formula: weight = mass x acceleration due to gravity.

No. Assuming you have a gun that can fire in space, you would travel in the opposite direction, conserving momentum, but because you are more massive than the bullet, your speed in the opposite direction would be less. Momentum is mass*velocity, so your speed should be less than the bullet's by the same factor as the ratio of the bullet's mass to your own. You would also start rotating unless your shot was perfectly aligned with your center of mass.

If that's not convincing, consider what happens if you shoot a bullet straight into the air. Does the earth move in the opposite direction at the same speed?

1 The position of Hydrogen is still undecided.

2 Group VIII B consists of three columns instead of one.

3 Like Mendleev's table it fails to accomodate the Lanthanides and Actinides in the main body of table.

4 Some elements which resemble in chemical properties are placed in separate groups like Li in IA and Mg in IIA . They show similarities in properties but are placed in separate groups.

the law of inertia

1

In boxing a fighter will experience this law when being hit. Before a punch is thrown the boxer will remain in a balanced position. At the point of contact, the punch delivers a force that will knock their opponent off balance. The head, the neck, or even the whole body can be moved with the force of a punch.

2

Typically a larger person, or a heavyweight boxer, would apply more force in a punch. This is true because the more mass along with acceleration yields a greater

net force in the equation F=ma. A hard hit comes from a hard punch. The harder the punch the quicker it has been thrown. Larger boxers can usually throw the quickest punch with their mass and acceleration.

3

In terms of boxing, Newton's Third Law is closely related with momentum. After a punch has landed, the opposing boxer moves from the force of the punch in the same direction. Many would ask if there is any equal force acting on one another why wouldn't they cancel out? This is rather hard to understand. The two forces, usually called the action-reaction forces, act on different bodies and do not yield a net force.

If you mean acceleration due to gravity it is ~9.8m/s2

1st law of motion

Sir Isaac Newton is credited with discovering the third law of motion, which states that for every action, there is an equal and opposite reaction. This law is one of the fundamental principles in classical mechanics.

The action force of a canoe moving through the water can be increased by increasing the paddling force applied by the paddler, increasing the surface area of the paddle to catch more water, and reducing the drag or resistance by maintaining a streamlined shape of the canoe.

. The amount of Force needed to make an object change its motion depends on the Mass of the object and the Force required

The first law of Newton states that an object will remain at rest or in uniform motion unless acted upon by a net external force. The second law of Newton states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically, F = ma expresses this relationship.

A continuous acceleration toward the center of the Earth equal to GM/R2 where G is the Gravitational Constant, M the mass of the Earth and R the distance between the satelite and the center of the Earth. If you multiply this by the mass of the sattelite itself, you get the force acting on the satelite to produce the acceleration. It is this force, causing this acceleration, which holds the satelite in orbit. Without it the satelite would obey Newton's first law of motion and just move out in a straight line. Note that this is true of any object orbiting any thing, whether it is an artificial satellite orbiting the earth, a planet or spacecraft orbiting the Sun, or a star orbiting the center of the galaxy.

Assuming that you're referring to an object that is accelerating towards a massive body by means of gravitational attraction...

When the force of frictional air resistance equals the opposing force of gravity, the net force on the object equals zero, and acceleration will cease. It is called terminal velocity, and the object will remain at this velocity until some new event happens.

Good, up until almost the end.

It's not an "opposing" force. It's an "external" force.

And the object in motion continues in "constant, uniform" motion. That's important.

It covers both constant speed and the straight line direction.

djfkjdsiuffjkds

The reaction force to the friction acting on the car is the friction force acting on the road. It acts on the car in the opposite direction to the friction force acting on the car.

rotation is normally rpm (revolutions per minute) , velocity of a particular point around an axis, example : distance from axis = 1 m , rpm = 10 000

circumference of 1m circle = 1m*2*pi (3.14159) = 6.28318 (meters) * 10 000 rpm = 62 831.8 meters/min = 1 047.197 meters / sec

No, all objects in the Universe generate a pulling force on all other objects. The Moon, Sun, planets, asteroids, meteors and stars all have a gravitational field. All humans, animals, trees, planes and buildings possess a gravitaional force, relative in size to its mass.

You are at rest when driving a car. Your car is in motion but you are not in motion. When you hit the brakes, you quickly go forward but your seat-belt will stop you from flying out of the windshield. Also if you do not put your seat-belt on then you will get a ticket.

9 km/s = 9000m/s

Gravity decreases the velocity of the object by 9.8 m/s each second.

The velocity at the top is 0 m/s

Equation 1: Velocity final = velocity initial - (9.8 m/s × time)

Final velocity =0 m/s

Initial velocity = 9000m/s

0 = 9000 - 9.8 t

9.8 t = 9000

t = 9000÷ 9.8

t = 918 seconds

Average velocity = (9000 + 0 ) ÷ 2 =4500 m/s

Height = average velocity × time

Height = 4500 m/s ×918 seconds=4,131,000 meters = 4,131 Km.

If you do not want to round, this equation will find the answer more accurately.

(velocity final) 2 - (velocity initial) 2 = 2 × acceleration × distance m/s2

0 - 90002 = 2 × 9.8 × d

d = 4,132,653.061 meters = 4,132.653061Km

I do not know of any measuring tool that measures that precisely!