A leftward force is applied to a dresser to accelerate it to the left across the bedroom floor. Ignore air resistance. (Grading on forces and magnitudes)
Question 5
5.
4
Question 6
6.
What is the net force on the object?
4
Question 8
8.
In the situation above, the force of letter D must be _______ Newtons, and letter E must be pulling with a force of _______ Newtons.
Question 9
9.
A doubling of the mass results in a __________ of the acceleration (if force is held constant).
Question 10
10.
A rightward force is applied to a 10-kg object to move it across a rough surface at constant velocity. The coefficient of friction between the object and the surface is 0.2. Use the diagram to determine the gravitational force, normal force, applied force, frictional force, and net force. (Neglect air resistance.)
Question 11
11.
Question 12
12.
Give an example of a action-reaction pair.
Question 13
13.
Determine the velocity of both the red and blue cart after the inelastic collision.
A 2-kg object is moving horizontally with a speed of 4 m/s.
How much net force is required to keep the object moving at this speed and in this direction?
8 N
12 N
0 N
4 N
In the helium balloon inside the car example, what was the conclusion the class reached as to why this did not violate the first law?
https://www.youtube.com/watch?v=XXpURFYgR2E
The air inside the car had a greater mass than the air in the balloon. This air moved as predicted by the first law. Since the air outside the balloon had less mass it forced the balloon with more mass to go in the opposite direction.
The air inside the car had a greater mass than the air inside the balloon. This air moved as predicted by the first law. Since the air outside the balloon had more mass it forced the balloon with less mass to go in the opposite direction.
The class decided that it did violate Netwon's First Law, because anything can violate a law of Physics.
The air inside the car had less mass than the air inside the balloon. This air moved as predicted by the first law. Since the air outside the balloon had less mass it forced the balloon with more mass to go in the opposite direction.
Why does constant velocity indicate NO net force?
net forces are connected to velocity, not acceleration
constant velocity means that there is acceleration, and therefore means that there is no net force
constant velocity means no acceleration, and for there to be a net force there must be an acceleration
for something to be moving at a constant velocity means there must be a force acting upon it somewhere (Mr. Fischers Example of the Laptop Case)
Question 7
7.
Explain what is happening to the object using the word 'acceleration'.
Explain what is meant by 'terminal velocity.'
Terminal velocity is when fgrav and net force become equal and then there ceases to be any fair on the object.
Terminal velocity is when fair becomes greater than fgrav and then the net force or acceleration on the object increases.
Terminal velocity is when fgrav and fair become equal and then there ceases to be any net force or acceleration on the object.
Terminal velocity is when net force and fair become equal and then there ceases to be any fgrav on the object.
