Brandyn Sexton 3.5.2 Practice:Forces 1/14/13
1,453 views
Skip to first unread message
brandyn...@yahoo.com
Jan 14, 2013, 9:06:17 AM1/14/13
to plc-physic...@googlegroups.com
Print
3.5.2 Practice: Forces
Practice Assignment
Physical Science (S1744040)
Brandyn Sexton
Points possible: 50
Date: __1/14/13__________
Newton's Laws of Motion
1.Define the term "force." (1 point)
the measure of mechanical action on a particle by other particle that characterizes the magnitude and direction of the action is said to be force applied to that particle.
2.Give an example of a "balanced force" and explain what makes it a balanced force. (3 points)
If you are arm wrestling and you guys are the same strength it would be a balanced force.
3.What are the Newton's three laws of motion? (6 points)
1. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. 2. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. 3. For every action there is an equal and opposite reaction.
4.Define the term "inertia" and describe an example of a situation where inertia is present. (2 points)
When something is acted upon by an outside force so it would be like if you are swinging and a ball is thrown at you, you slow down because that ball hit you.
5.Calculate the force it would take to accelerate a 250 kg motorcycle at a rate of 5 m/s2. (1 point)
F = m A = (250) (5) = 1,250 newtons.
Friction:
1.Define friction. Name and describe two kinds of friction. (4 point)
there is two kinds of friction: static and kinetic
static is friction BEFORE the object is moving
kinetic friction is when the object is moving
friction can be find Ff=M*Fn.
friction is something that makes an object not move, it prevents it from moving but there is usually another force that exceeds friction and makes the object move.
2. What are the two factors that determine the strength of the force of friction between two sliding objects? (2 points)
The force of friction between two objects is the product of the normal force and the coefficient of friction. The normal force is the component of force that is perpendicular to the plane of friction. For example, if you are pushing on a block of wood on the floor with a force F at an angle of 30 degrees above the horizontal, then the normal force N = F sin 30.
3 A. What does the "coefficient of friction" tell you? (3 points)
The coefficient of friction is a scalar value with no dimension. It is simply a ratio of the force of friction between two objects, to the force pressing those objects together (often the normal force). Slippery surfaces have lower coefficient of friction than rough surfaces.
B. Give an example of two surfaces that would have a low coefficient of friction. (1 points)
Ice and glass both have low coefficients of friction. The smoother the object's surface, the lower the coefficient of friction of the object.
C. Give an example of two surfaces that would have a high coefficient of friction. (1 point)
Sandpaper and dry concrete.
Centripetal Force:
1.Define the term "centripetal force." (1 point)
A force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.
2.Give an example of "centripetal acceleration." (1 point)
Roulette. The ball going in a circle is an example of centripetal force, its speed (whatever it may be) is constantly changing so it is Acceleration. In other words, it is Centripetal Acceleration.
3.A. What is the difference between linear motion and circular motion? (2 points)
Linear is straight and does not require a continuous acceleration as circular motion does.
B. Give an example of each type of motion. (2 points)
Translational motion results in a change of location.
Oscillatory motion is repetitive and fluctuates between two locations.
Rotational motion occurs when an object spins.
The last type of motion is Chaotic motion , It is predictable in theory but unpredictable in practice, which makes it appear random. atoms move.
4.Why does the moon orbit Earth as opposed to the sun? (2 points)
The moon is much closer to the Earth than it is to the sun, and has been captured by the Earth's gravitational field. But note that since the Earth orbits the sun, it is taking the moon with it, so the moon also orbits the sun, as well as the Earth.
5.What is the Universal Law of Gravitation? (1 point)
Universal Law Of Gravitation States That Every Object In The Universe Attracts Each And Every Other Object With A Force Which Is Directly Proportional To The Masses Of The Body And Inversely Proportional To The Square Of The Distance Between Them.
6.What two factors influence the attraction between objects? (2 points)
the two are:
- the mass of the objects.
- the distance in between the objects.
Buoyant Force:
1.Describe Archimedes' Principle. (2 points)
The Principle states that the mass of a liquid displaced by a floating body is equal to the mass of that body.
2.Describe the two opposing forces acting on an object floating in water. (2 points)
Weight and buoyant force.
3.A. Define the term "density." (1 point)
Density = Mass/Volume
Density can be only be determined (on paper) if the mass and volume are given.
B. What two factors determine the density of a fluid? (2 points)
The density is the mass divided by the volume.
4.Explain how a heavy boat floats on water. (4 points)
The weight of the volume of water that it displaces is greater than the weight of the entire boat (Archimedes principle). You see now that even though a boat is made out of steel, it can still float as the bulkheads of the boat are essentially hollow.
5.From what you have learned about buoyancy, how does a submarine submerge and then float on water? (4 points)
Submarines have ballast tanks. The tanks can hold air, or they can be "vented" and water can flow into them and fill them completely. When the tanks are full of air, the submarine is buoyant and floats. When the main vents are opened, the tanks are flooded and the submarine submerges. When the submarine is submerged and wants to surface, air can be injected at high pressure into the ballast tanks to force out water and again make the submarine buoyant and cause it to rise to the surface and float.
Copyright © 2012 Apex Learning Inc. (See Terms of Use at www.apexvs.com/TermsOfUse)
3.5.2 Practice: Forces
Practice Assignment
Physical Science (S1744040)
Brandyn Sexton
Points possible: 50
Date: __1/14/13__________
Newton's Laws of Motion
1.Define the term "force." (1 point)
the measure of mechanical action on a particle by other particle that characterizes the magnitude and direction of the action is said to be force applied to that particle.
2.Give an example of a "balanced force" and explain what makes it a balanced force. (3 points)
If you are arm wrestling and you guys are the same strength it would be a balanced force.
3.What are the Newton's three laws of motion? (6 points)
1. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. 2. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. 3. For every action there is an equal and opposite reaction.
4.Define the term "inertia" and describe an example of a situation where inertia is present. (2 points)
When something is acted upon by an outside force so it would be like if you are swinging and a ball is thrown at you, you slow down because that ball hit you.
5.Calculate the force it would take to accelerate a 250 kg motorcycle at a rate of 5 m/s2. (1 point)
F = m A = (250) (5) = 1,250 newtons.
Friction:
1.Define friction. Name and describe two kinds of friction. (4 point)
there is two kinds of friction: static and kinetic
static is friction BEFORE the object is moving
kinetic friction is when the object is moving
friction can be find Ff=M*Fn.
friction is something that makes an object not move, it prevents it from moving but there is usually another force that exceeds friction and makes the object move.
2. What are the two factors that determine the strength of the force of friction between two sliding objects? (2 points)
The force of friction between two objects is the product of the normal force and the coefficient of friction. The normal force is the component of force that is perpendicular to the plane of friction. For example, if you are pushing on a block of wood on the floor with a force F at an angle of 30 degrees above the horizontal, then the normal force N = F sin 30.
3 A. What does the "coefficient of friction" tell you? (3 points)
The coefficient of friction is a scalar value with no dimension. It is simply a ratio of the force of friction between two objects, to the force pressing those objects together (often the normal force). Slippery surfaces have lower coefficient of friction than rough surfaces.
B. Give an example of two surfaces that would have a low coefficient of friction. (1 points)
Ice and glass both have low coefficients of friction. The smoother the object's surface, the lower the coefficient of friction of the object.
C. Give an example of two surfaces that would have a high coefficient of friction. (1 point)
Sandpaper and dry concrete.
Centripetal Force:
1.Define the term "centripetal force." (1 point)
A force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.
2.Give an example of "centripetal acceleration." (1 point)
Roulette. The ball going in a circle is an example of centripetal force, its speed (whatever it may be) is constantly changing so it is Acceleration. In other words, it is Centripetal Acceleration.
3.A. What is the difference between linear motion and circular motion? (2 points)
Linear is straight and does not require a continuous acceleration as circular motion does.
B. Give an example of each type of motion. (2 points)
Translational motion results in a change of location.
Oscillatory motion is repetitive and fluctuates between two locations.
Rotational motion occurs when an object spins.
The last type of motion is Chaotic motion , It is predictable in theory but unpredictable in practice, which makes it appear random. atoms move.
4.Why does the moon orbit Earth as opposed to the sun? (2 points)
The moon is much closer to the Earth than it is to the sun, and has been captured by the Earth's gravitational field. But note that since the Earth orbits the sun, it is taking the moon with it, so the moon also orbits the sun, as well as the Earth.
5.What is the Universal Law of Gravitation? (1 point)
Universal Law Of Gravitation States That Every Object In The Universe Attracts Each And Every Other Object With A Force Which Is Directly Proportional To The Masses Of The Body And Inversely Proportional To The Square Of The Distance Between Them.
6.What two factors influence the attraction between objects? (2 points)
the two are:
- the mass of the objects.
- the distance in between the objects.
Buoyant Force:
1.Describe Archimedes' Principle. (2 points)
The Principle states that the mass of a liquid displaced by a floating body is equal to the mass of that body.
2.Describe the two opposing forces acting on an object floating in water. (2 points)
Weight and buoyant force.
3.A. Define the term "density." (1 point)
Density = Mass/Volume
Density can be only be determined (on paper) if the mass and volume are given.
B. What two factors determine the density of a fluid? (2 points)
The density is the mass divided by the volume.
4.Explain how a heavy boat floats on water. (4 points)
The weight of the volume of water that it displaces is greater than the weight of the entire boat (Archimedes principle). You see now that even though a boat is made out of steel, it can still float as the bulkheads of the boat are essentially hollow.
5.From what you have learned about buoyancy, how does a submarine submerge and then float on water? (4 points)
Submarines have ballast tanks. The tanks can hold air, or they can be "vented" and water can flow into them and fill them completely. When the tanks are full of air, the submarine is buoyant and floats. When the main vents are opened, the tanks are flooded and the submarine submerges. When the submarine is submerged and wants to surface, air can be injected at high pressure into the ballast tanks to force out water and again make the submarine buoyant and cause it to rise to the surface and float.
Copyright © 2012 Apex Learning Inc. (See Terms of Use at www.apexvs.com/TermsOfUse)
jmar...@edu.lexington4.net
Nov 17, 2015, 3:01:00 PM11/17/15
to PLC Physical Science, brandyn...@yahoo.com
plew_...@battlegroundps.org
May 30, 2016, 9:12:22 AM5/30/16
to PLC Physical Science, brandyn...@yahoo.com, jmar...@edu.lexington4.net
tjpe...@gmail.com
Feb 24, 2018, 1:43:20 AM2/24/18
to PLC Physical Science
nice post and thanks for the awnsers XDXDXDXDXDXDXD
Reply all
Reply to author
Forward
0 new messages