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To calculate the velocity after a perfectly elastic collision, you need to apply the principle of conservation of momentum and kinetic energy. First, find the initial momentum of the system before the collision by adding the momenta of the objects involved. Then, find the final momentum after the collision by equating it to the initial momentum. Next, solve for the final velocities of the objects by dividing the final momentum by their respective masses. Finally, make sure to check if the kinetic energy is conserved by comparing the initial and final kinetic energy values.

The number of dogs needed to pull a lorry would depend on the size and weight of the lorry. Generally, a team of dogs called a dog sled team consisting of 8-12 dogs is used to pull heavy loads, but this may vary depending on the specific circumstances.

The open end of the balloon must face backwards because when air is released from the balloon, it creates propulsion in the opposite direction, which propels the car forward. If the open end of the balloon faced forward, the expelled air would create propulsion in the wrong direction, causing the car to move backward.

The law of motion that relates to a dog pulling a sled is Newton's third law of motion. It states that for every action, there is an equal and opposite reaction. In this case, as the dog exerts force on the sled by pulling it forward, there is an equal and opposite force exerted by the sled on the dog, enabling the forward movement of the sled.

The force the other team will have to overcome to win is the sum of the forces exerted by you and your friend, which is 3 newtons + 8 newtons = 11 newtons. So, the other team will have to exert a force greater than 11 newtons to win the tug of war.

When Jim Walewander slides into second base, his momentum carries him forward towards the base. As he reaches the base, his momentum slows down and eventually stops, allowing him to come to a complete rest. The friction between his body and the ground helps to slow him down and maintain his balance during the slide.

A net force will increase an object's velocity when the force is applied in the same direction as the object's current velocity. This will result in acceleration in that direction, causing the object's velocity to increase over time.

The rocket is pushed forwards by the reaction to the force ejecting gas in the opposite direction to the direction of travel of the rocket. Rocket flight is an example of Newton's 3rd law of motion, which states that every action (force) has an equal and opposite reaction. In this case, the action is the ejection of rocket gas and the reaction is the forward force on the rocket.

It depends on the direction of the two forces. If the two forces are in the same direction, the net force would be 60N or -60N. If the two forces are in opposite directions the net force would be either 30N or -30N.

When an object is falling in a gravity field, its mass does not affect its acceleration. If under the influence of friction then it takes more energy to accelerate it the larger mass it has, here on Earth. The larger the mass the more potential it has to do work if it is above the surface of the earth than a smaller mass. But in turn, to get it to the higher point more work must be done for a larger mass than a smaller mass.

According to Newton's 2nd Law,

Net Force = Mass x Acceleration

Therefore, if an object is undergoing acceleration, it follows that you definitely are looking at an object with a net force.

With a net force, the sum of the forces acting on the object is not equal to zero, and so forces acting on it are not balanced.

As for the last question, the query has not been stated clearly. Rephrase, please? (:

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The force applied by a machine to overcome resistance due to gravity or friction is known as the applied force. Applied force is the amount of force needed to move an object against a resisting force, such as the force of gravity or friction. This force is usually measured in Newtons (N).

- When an object is stationary, the applied force is equal to the resisting force.
- When an object is moving, the applied force must be greater than the resisting force in order to maintain the object's motion.
- If the applied force is too small, the object will slow down and eventually stop.
- If the applied force is too great, the object may accelerate or move too quickly.

In order to determine the applied force, the resisting force must first be calculated. This can be done by multiplying the mass of the object by the acceleration due to gravity. The resisting force due to friction can be calculated by multiplying the normal force of the object by the coefficient of friction between the object and the surface it is in contact with.

The gravitational force (F) between two masses (m1 and m2) is given by: F = (G * m1 * m2) /r^2. Where r is the distance between the masses, and G is the gravitational constant, 6.67300 * 10^-11.

This means the larger the masses are, the more they pull toward each other. It also means that the closer they get, the stronger they pull.

Gravity is an example of gravity. Light is an example of the electromagnetic force.

The other two are a lot trickier, because they act only over very short distances and there aren't really good everyday examples of them.

The weak force is the cause of certain kinds of radioactive decay.

The color force is what holds hadrons together, which is even more esoteric.

Friction made it difficult to discover newton's first law because under the law an object in motion will remain in motion at a constant velocity unless acted upon by an external force. Friction is an external force that slows objects in motion due to air friction (drag) and rolling resistance, making it appear as though this law is untrue.

1687

Newton first published these laws in Philosophiae Naturalis Principia Mathematica (1687) and used them to prove many results concerning the motion of physical objects. In the third volume (of the text), he showed how, combined with his law of universal gravitation, the laws of motion would explain Kepler's laws of planetary motion.

http://www.nationmaster.com/encyclopedia/Newton%27s-second-law-of-motion

Isaac Newtons discoveries had many effects on the world without them we wouldn't have gotten far we would still be wondering what is motion, gravity and light is and what its there for. His discovery has opened doors for many people and also science. In the future we would have made much better things because of these amazing discoveries and know and understand more about it and why its there for us.

this was answered by anonymous (@llz.P)

Because there's nothing to stop it. Newton's 1st law of motion states that an object at rest will stay at rest, and a moving object will continue to move at the same velocity, unless a force acts upon it. A moving car stops when it loses power because of friction between the tires and the road acting upon it, a thrown ball loses forward velocity and gains downward velocity because of gravity acting up on it; nothing stops moving, or moves slower, unless an outside force causes it to do so.

There is no fixed distance from which a person can fall and not survive. There are too many variables that will make any conclusion inaccurate. A person can suffer a broken neck falling down a flight of stairs or from the roof of a single story home. Fatal falls might be generalized as just about anything over a few stories. Three, four or five (at 8' to 10' per floor, depending on who you talk to) floors will be the "breakover point" and it's pretty much a done deal there. Certainly there are exceptions that can be cited. There is the true story of a Yugoslavian flight attendant who rode a chunk of broken aircraft into the ground from some 30,000 plus feet. She had a number of fairly serious injuries, but recovered fully. And a British tail gunner in a bomber which was shot down during WWII flight operations jumped from his burning aircraft at some 18,000 feet and had his fall broken by pine tree branches and soft snow. He sprained a leg. There are a few other similar stories, but these are the rare exceptions to the rule. If you want to flog this a bit, you'll have to plot some incidents and do some statistical analysis. OSHA might be a good place to start since they look at hazards in the workplace. Grab some data and a pencil and graph paper. You'll doubtless get what is called an "s-curve" when you lay it out. The plot starts up, then increases in slope, then decreases in slope, and then decreases more in slope until the slope approaches zero. In the middle of the s-curve is the "50-50" point where you have an even chance to live or die in a fall. To see what an s-curve looks like, use the line below. Good luck with your statistics.

If the object accelerates, that means the forces are NOT balanced.