Warm-Ups
2/27/12
-What is a good definition or a force, balanced force and an unbalanced force? Include a picture of each word.
*Force: a push or pull on an object
*Balanced Force: when equal force is applied to both sides of an object.
*Unbalanced Force: a force that pulls or pushes more on one side than the other side of the object.
-What is a good definition or a force, balanced force and an unbalanced force? Include a picture of each word.
*Force: a push or pull on an object
*Balanced Force: when equal force is applied to both sides of an object.
*Unbalanced Force: a force that pulls or pushes more on one side than the other side of the object.
2/28/12
-Explain how tug of war demonstrates an unbalanced force.
Because the same amount of strength was not applied to both sides of the rope, then the forces were not balanced.
2/29/12
-What is the net force acting on the object? 10 N.
-Which direction will the table move? left.
-Is this a balanced force or unbalanced force? unbalanced.
3/1/12
-What is the net force acting on the object?
100N
-Are the forces balanced or unbalanced?
unbalanced because the forces are pulling and pushing the same direction.
-Describe how the forces will affect the motion of the object
The object will move towards the right.
3/2/12
-What is the net force acting on the object?
0N
-Are the forces balanced or unbalanced?
balanced
-Describe how the forces will affect the object.
It won't accelerate or change direction
-What is the net force acting on the object?
20N
-Are the forces balanced or unbalanced?
unbalanced
-Describe how the forces will affect the motion of the object?
the object will move 20N to the right.
3/5/12
-The student is expected to differentiate between speed, velocity, and acceleration.
-Which would have the most displacement- a cheetah running across the plain to catch his prey or a monarch butterfly migrating from Canada to Mexico?
Monarch butterfly because it is moving across the continent, while the cheetah is just running across the plain.
3/7/12
-How would you graph constant speed?
A horizontal straight line (-)
-How would you graph acceleration?
Like a forward slash, straight line leaning forward (/)
3/8/12
-What is the car's speed at 4 seconds?
7.5 m/s
-What is the average speed of the car?
10 m/s
-Is the car's speed constant? Explain.
No because the car's speed does not increase at a steady rate each second.
-If the y-axis was labeled speed (m/s), what would be the average acceleration between 1 second and 5 seconds?
12 m/s (squared)
3/9/12
-What is he average velocity of the car between 2 and 5 seconds?
14 m/s
-If the y-axis was labeled velocity (m/s) what would be the average acceleration between 2 seconds and 4 seconds?
12 m/s (squared)
-If the graph represented speed and not velocity what would it look like and why?
Graph it and go from one point to the same point. Have the graph go back to the beginning point.
3/19/12
Between which two points does the object stop?
C and D
Between which two points does the object have the greatest speed?
A and B, it covered a greater distance in shorter time.
Describe and compare the motion of the object between Points A and B to Points B and C?
The distance is quickly increasing in A-B but in B-C, the distance decreases gradually.
At which points does the object change directions?
At point B and D
Calculate the speed at Point E.
3.75 m/s.
Calculate the average speed and the average velocity.
9 m/s & 5 m/s
VELOCITY=DISPLACEMENT/TIME
SPEED=TOTAL DISTANCE/TOTAL TIME
3/20/12
What is the acceleration from 3-5 seconds?
50/5=10 m/s
18/3=6 m/s
10-6/5-3=4/2= 2 m/s (squared)
3/21/12
Acceleration between 2 and 4 secs
8/2=4
32/4=8
8-4/4-2
4/2
2m/s
Velocity at 7 seconds.
14 m/s
3/23/12
If you were to jump off a tall bridge and then jump out of a moving airplane, would you ave the same falling sensation or would the sensation feel different? Why?
It feels completely different because when you jump off the bridge, the body descends in a vertical position, but when you jump out of a moving airplane, you jump in a horizontal direction.
3/26/12
Using a weekend experience, explain how Newton's first law applies.
I basically sat at home and did nothing, ate when I was hungry, hence Newton's first law-an object at rest stay at rest unless an unbalanced force is applied- so the unbalanced force would be hunger, causing me to move from the couch on which I was sitting.
3/29/12
A 4 kg object is moving across a friction free surface with a constant velocity of 2m/s. Which one of the following horizontal forces is necessary to maintain this state of motion? a. 0 N because 8, 2, and .5 N, if they're applied, they will accelerate, meaning the object will not stay at a constant speed.
4/2/12
1) What is the force the man is applying on the car? 50 N
2) What is the acceleration of the sled? 2m/s/s.
4/3/12
A.
4/4/12
Identify as many pairs of action-reaction force pairs in the diagram below.
-Tractor and person (pulling of person)
-Elephant and ground (friction of ground)
-Tractor and ground (friction of ground)
-Air resistance and tractor
-Explain how tug of war demonstrates an unbalanced force.
Because the same amount of strength was not applied to both sides of the rope, then the forces were not balanced.
2/29/12
-What is the net force acting on the object? 10 N.
-Which direction will the table move? left.
-Is this a balanced force or unbalanced force? unbalanced.
3/1/12
-What is the net force acting on the object?
100N
-Are the forces balanced or unbalanced?
unbalanced because the forces are pulling and pushing the same direction.
-Describe how the forces will affect the motion of the object
The object will move towards the right.
3/2/12
-What is the net force acting on the object?
0N
-Are the forces balanced or unbalanced?
balanced
-Describe how the forces will affect the object.
It won't accelerate or change direction
-What is the net force acting on the object?
20N
-Are the forces balanced or unbalanced?
unbalanced
-Describe how the forces will affect the motion of the object?
the object will move 20N to the right.
3/5/12
-The student is expected to differentiate between speed, velocity, and acceleration.
-Which would have the most displacement- a cheetah running across the plain to catch his prey or a monarch butterfly migrating from Canada to Mexico?
Monarch butterfly because it is moving across the continent, while the cheetah is just running across the plain.
3/7/12
-How would you graph constant speed?
A horizontal straight line (-)
-How would you graph acceleration?
Like a forward slash, straight line leaning forward (/)
3/8/12
-What is the car's speed at 4 seconds?
7.5 m/s
-What is the average speed of the car?
10 m/s
-Is the car's speed constant? Explain.
No because the car's speed does not increase at a steady rate each second.
-If the y-axis was labeled speed (m/s), what would be the average acceleration between 1 second and 5 seconds?
12 m/s (squared)
3/9/12
-What is he average velocity of the car between 2 and 5 seconds?
14 m/s
-If the y-axis was labeled velocity (m/s) what would be the average acceleration between 2 seconds and 4 seconds?
12 m/s (squared)
-If the graph represented speed and not velocity what would it look like and why?
Graph it and go from one point to the same point. Have the graph go back to the beginning point.
3/19/12
Between which two points does the object stop?
C and D
Between which two points does the object have the greatest speed?
A and B, it covered a greater distance in shorter time.
Describe and compare the motion of the object between Points A and B to Points B and C?
The distance is quickly increasing in A-B but in B-C, the distance decreases gradually.
At which points does the object change directions?
At point B and D
Calculate the speed at Point E.
3.75 m/s.
Calculate the average speed and the average velocity.
9 m/s & 5 m/s
VELOCITY=DISPLACEMENT/TIME
SPEED=TOTAL DISTANCE/TOTAL TIME
3/20/12
What is the acceleration from 3-5 seconds?
50/5=10 m/s
18/3=6 m/s
10-6/5-3=4/2= 2 m/s (squared)
3/21/12
Acceleration between 2 and 4 secs
8/2=4
32/4=8
8-4/4-2
4/2
2m/s
Velocity at 7 seconds.
14 m/s
3/23/12
If you were to jump off a tall bridge and then jump out of a moving airplane, would you ave the same falling sensation or would the sensation feel different? Why?
It feels completely different because when you jump off the bridge, the body descends in a vertical position, but when you jump out of a moving airplane, you jump in a horizontal direction.
3/26/12
Using a weekend experience, explain how Newton's first law applies.
I basically sat at home and did nothing, ate when I was hungry, hence Newton's first law-an object at rest stay at rest unless an unbalanced force is applied- so the unbalanced force would be hunger, causing me to move from the couch on which I was sitting.
3/29/12
A 4 kg object is moving across a friction free surface with a constant velocity of 2m/s. Which one of the following horizontal forces is necessary to maintain this state of motion? a. 0 N because 8, 2, and .5 N, if they're applied, they will accelerate, meaning the object will not stay at a constant speed.
4/2/12
1) What is the force the man is applying on the car? 50 N
2) What is the acceleration of the sled? 2m/s/s.
4/3/12
A.
4/4/12
Identify as many pairs of action-reaction force pairs in the diagram below.
-Tractor and person (pulling of person)
-Elephant and ground (friction of ground)
-Tractor and ground (friction of ground)
-Air resistance and tractor