physics: metric systems Essays | Online Homework Help

Answer all of the following questions. Do not send in a partially completed assignment. Answer each question as completely as possible, but do not merely copy answers from your reading materials. If you cite a reference in the text, explain the meaning of the citation.

Answer the following:
What are the units of mass and the units of weight for the metric system?
What are the units of mass and the units of weight for the English system?
Explain the relationship between the mass and the weight of an object. Is the mass of an object the same on earth and the moon? Are the weights the same on earth and the moon?
In your own words, explain Newton’s second law of motion and give two examples.
How does mass affect the rate of acceleration in free fall:
In air?
In a vacuum?
If the mass of a sliding block is tripled while a constant net force is applied, by how much does the acceleration decrease?
Explain the difference between a vector and a scalar quantity. Give at least two examples of different variables that are vector and scalar quantities.
Give an example of Newton’s third law of motion and explain why it is an example.
For each of the following interactions, identify the action and reaction forces:
A hammer hits a nail.
Earth’s gravity pulls down on a book.
A helicopter blade pushes air downward.
Answer the following questions:
If you stand next to a wall on a frictionless skateboard and push the wall with a force of 30 Newtons, how hard does the wall push on you?
If your mass is 60 kilograms, what is your acceleration?

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In Discussion Forum 2, post your response to the following discussion questions. Reply to at least two classmates’ responses by the date indicated in the Course Calendar.

A 5-kg fish swallows an absent minded 1-kg fish swimming toward it at a velocity that brings both fish to a halt immediately after lunch. What is the velocity of the smaller fish before it becomes lunch?
Use the concepts of this chapter to describe what would happen if you fire a gun that has bullet ten times as massive as the gun.
An apple falls from a tree and strikes the ground without bouncing. What happens to its momentum? Is momentum conserved?
You and your friend toss a ball back and forth in the middle aisle of an airplane in flight. Does the kinetic energy of the ball depend on the speed of the airplane?

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