3.5.2 Forces. Ashton Rhodes
ashtonly...@gmail.com
1.Define the term "force." (1 point)
A push or pull that causes a change in motion.
2.Give an example of a "balanced force" and explain what makes it a balanced force. (3 points)
A balanced force that acts on a single object in the opposite direction and can cancel each other out. ( i got this out of the lesson. not the internet)
3.What are the Newton's three laws of motion? (6 points)
1. an object will maintain its state of a straight line motion until acted upon by an unbalanced force.
2.An object acceleration is directly related to the net force applied and inversely to the mass of the object.
3.When one object exerts a force on a second object always exerts a force on the back of the first object that's equal in magnitude and opposite in direction.
4.Define the term "inertia" and describe an example of a situation where inertia is present. (2 points)
The property of a body that resist any change to its uniform straight motion.
a car hitting a wall.
5.Calculate the force it would take to accelerate a 250 kg motorcycle at a rate of 5 m/s2. (1 point)
250kg*5m/s2=1250
Friction:
1.Define friction. Name and describe two kinds of friction. (4 point)
The force that opposes motion when two materials touch each other.
Static friction
kinetic friction
2. What are the two factors that determine the strength of the force of friction between two sliding objects? (2 points)
3 A. What does the "coefficient of friction" tell you? (3 points)
Its a scaler with no demintion.
B. Give an example of two surfaces that would have a low coefficient of friction. (1 points)
rubber and concrete
C. Give an example of two surfaces that would have a high coefficient of friction. (1 point)
Dont really know
Centripetal Force:
1.Define the term "centripetal force." (1 point)
a force that makes a body follow a curved path
2.Give an example of "centripetal acceleration." (1 point)
roller coaster with loops
3.A. What is the difference between linear motion and circular motion? (2 points)
circular motion is making something go in a circle
linear motion makes you go in a straight line
B. Give an example of each type of motion. (2 points)
nahh
4.Why does the moon orbit Earth as opposed to the sun? (2 points)
because the the sun is too hot. lol
5.What is the Universal Law of Gravitation? (1 point)
Something that this man made up.
6.What two factors influence the attraction between objects? (2 points)
gravity and something else
Buoyant Force:
1.Describe Archimedes' Principle. (2 points)
i dont know what that is.
2.Describe the two opposing forces acting on an object floating in water. (2 points)
i dont know
3.A. Define the term "density." (1 point)
its the mass of an object.
B. What two factors determine the density of a fluid? (2 points)
ehh...
4.Explain how a heavy boat floats on water. (4 points)
because there is air in them and when you hold your breath when you are under water you float up.
5.From what you have learned about buoyancy, how does a submarine submerge and then float on water? (4 points)
You let the air out of the submarine and than put more air in it. duhh.
Williams, Sue
1.Define the term "force." (1 point)
A push or pull that causes a change in motion.
1 point
2.Give an example of a "balanced force" and explain what makes it a balanced force. (3 points)
A balanced force that acts on a single object in the opposite direction and can cancel each other out. ( i got this out of the lesson. not the internet)
3 points
3.What are the Newton's three laws of motion? (6 points)
1. an object will maintain its state of a straight line motion until acted upon by an unbalanced force.
2.An object acceleration is directly related to the net force applied and inversely to the mass of the object.
3.When one object exerts a force on a second object always exerts a force on the back of the first object that's equal in magnitude and opposite in direction.
6 points
4.Define the term "inertia" and describe an example of a situation where inertia is present. (2 points)
The property of a body that resist any change to its uniform straight motion.
2 points
a car hitting a wall.
5.Calculate the force it would take to accelerate a 250 kg motorcycle at a rate of 5 m/s2. (1 point)
250kg*5m/s2=1250
1 point
Friction:
1.Define friction. Name and describe two kinds of friction. (4 point)
The force that opposes motion when two materials touch each other.
Static friction
kinetic friction
4 points
2. What are the two factors that determine the strength of the force of friction between two sliding objects? (2 points)
0 points
3 A. What does the "coefficient of friction" tell you? (3 points)
Its a scaler with no demintion.
0 points
B. Give an example of two surfaces that would have a low coefficient of friction. (1 points)
rubber and concrete
C. Give an example of two surfaces that would have a high coefficient of friction. (1 point)
Dont really know
0 points
Centripetal Force:
1.Define the term "centripetal force." (1 point)
a force that makes a body follow a curved path
1 point
2.Give an example of "centripetal acceleration." (1 point)
roller coaster with loops
0 points
3.A. What is the difference between linear motion and circular motion? (2 points)
circular motion is making something go in a circle
linear motion makes you go in a straight line
2 points
B. Give an example of each type of motion. (2 points)
nahh
0 points
4.Why does the moon orbit Earth as opposed to the sun? (2 points)
because the the sun is too hot. lol
0 points
5.What is the Universal Law of Gravitation? (1 point)
Something that this man made up.
0 points
6.What two factors influence the attraction between objects? (2 points)
gravity and something else
Buoyant Force:
1.Describe Archimedes' Principle. (2 points)
i dont know what that is.
0 points
2.Describe the two opposing forces acting on an object floating in water. (2 points)
i dont know
0 points
3.A. Define the term "density." (1 point)
its the mass of an object.
0 points
B. What two factors determine the density of a fluid? (2 points)
ehh...
0 points
4.Explain how a heavy boat floats on water. (4 points)
because there is air in them and when you hold your breath when you are under water you float up.
5.From what you have learned about buoyancy, how does a submarine submerge and then float on water? (4 points)
You let the air out of the submarine and than put more air in it. duhh.
1 point
--