| Motion graphs | Friction | Acceleration | Force | Potpourri |
| 10 | 10 | 10 | 10 | 10 |
| 20 | 20 | 20 | 20 | 20 |
| 30 | 30 | 30 | 30 | 30 |
| 40 | 40 | 40 | 40 | 40 |
| 50 | 50 | 50 | 50 | 50 |
| Final Question | ||||
A steeper line on a postion vs. time graphs indicates what about the speed?
A steeper line on a postion vs. time graphs indicates what about the speed?
Moving faster
What does a flat line on a speed vs. time graph represent in terms of acceleration?
What does a flat line on a speed vs. time graph represent in terms of acceleration?
zero acceleration
sketch a postion vs. time, speed vs. time, and acceleration vs. time graph for an object that is slowing down at a constant rate in the + direction.
sketch a postion vs. time, speed vs. time, and acceleration vs. time graph for an object that is slowing down at a constant rate in the + direction.
See board
sketch a position vs. time graph for the following scenario: A man walks forward at a constant rate, then he starts running at a constant rate, then he slows gradually to a stop and stays stopped.
sketch a position vs. time graph for the following scenario: A man walks forward at a constant rate, then he starts running at a constant rate, then he slows gradually to a stop and stays stopped.
See board
sketch the position vs. time graph, velocity vs. time graph, and acceleration vs. time graph for a skydiver jumping out of an airplane until they reach the ground.
sketch the position vs. time graph, velocity vs. time graph, and acceleration vs. time graph for a skydiver jumping out of an airplane until they reach the ground.
see board
What Greek letter is used to signifiy the coefficient of friction?
What Greek letter is used to signifiy the coefficient of friction?
mu
To find the coefficient of kinetic friction by what must you divide the frictional force needed to keep an object moving at a constant rate? (Be more specfic than "weight")
To find the coefficient of kinetic friction by what must you divide the frictional force needed to keep an object moving at a constant rate? (Be more specfic than "weight")
Normal force
If you were wanting to see how far you could slide along a sidewalk when it was rainy, would you want a shoe with a mu of .5 or .2?
If you were wanting to see how far you could slide along a sidewalk when it was rainy, would you want a shoe with a mu of .5 or .2?
.2
What is the SI unit for the coefficient of friction?
What is the SI unit for the coefficient of friction?
There is no unit
Newtons/Newtons cancel out
A box slides down a ramp. A 10-N force of gravity is pulling the box down the ramp while a 2-N force of friction acts to stop the box. What is the net force accelerating the box down the ramp?
A box slides down a ramp. A 10-N force of gravity is pulling the box down the ramp while a 2-N force of friction acts to stop the box. What is the net force accelerating the box down the ramp?
8 newtons
A car drives at constant speed around a corner. Is it accelerating?
A car drives at constant speed around a corner. Is it accelerating?
Yes, the velocity is changing because the direction is changing and thus there is a net force acting on the car and thus there is acceleration.
The constant slope of a velocity (m/sec) vs. time (sec) graph is -1.3 . What is the acceleration of the object that is being graphed?
The constant slope of a velocity (m/sec) vs. time (sec) graph is -1.3 . What is the acceleration of the object that is being graphed?
-1.3 m/sec2
An object is moving forward but has negative acceleration. Describe this motion.
An object is moving forward but has negative acceleration. Describe this motion.
slowing down
The acceleration due to gravity is:
a 9.8 m/s2 on Earth.
b signified by the letter g.
c a downward acceleration.
d less on the moon than on Earth
e All of the above
The acceleration due to gravity is:
a 9.8 m/s2 on Earth.
b signified by the letter g.
c a downward acceleration.
d less on the moon than on Earth
e All of the above
e
A sports car reaches a speed of 25 m/s in 5 seconds after starting from rest. If its acceleration stays the same, what will the speed of the car be at 10 seconds?
a 5 m/s
b 50 m/s
c 125 m/s
d 500 m/s
A sports car reaches a speed of 25 m/s in 5 seconds after starting from rest. If its acceleration stays the same, what will the speed of the car be at 10 seconds?
a 5 m/s
b 50 m/s
c 125 m/s
d 500 m/s
b 50 m/sec
What is the powerful energy field used by the Jedi in Star Wars called?
What is the powerful energy field used by the Jedi in Star Wars called?
The Force
The moon is 1/6th as massive as the earth. What would the mass of a 60 kg person be on the moon?
The moon is 1/6th as massive as the earth. What would the mass of a 60 kg person be on the moon?
60 kg
The g force on Mars is roughly 2/5 of the earth's. How would the weight of a 100 pound person on earth compare to their weight on Mars?
The g force on Mars is roughly 2/5 of the earth's. How would the weight of a 100 pound person on earth compare to their weight on Mars?
100 pounds on earth is about 40 pounds on Mars
An object weighs 600. newtons on earth. What is its mass, in kg?
An object weighs 600. newtons on earth. What is its mass, in kg?
61.2 kg
w= m x g
m= w/g
600/9.8
Two men are having a tug-of-war. One individual pulls East with a force of 1000 newtons, and the other pulls to the West with a force of 1,200 newtons. Describe the net force and direction with a vector and state the tension on the rope.
Two men are having a tug-of-war. One individual pulls East with a force of 1000 newtons, and the other pulls to the West with a force of 1,200 newtons. Describe the net force and direction with a vector and state the tension on the rope.
200 newtons west
Tension on rope = 1000 newtons
System will be accelerating to the west
Which of the following is a projectile:
A ball thrown into the air
An airplane
A ball rolling across a field
A stapler sliding across a desk
Which of the following is a projectile:
A ball thrown into the air
An airplane
A ball rolling across a field
A stapler sliding across a desk
Ball thrown into the air
Ta on the data collector reads .0071 s after your energy car passes photogate A. What is the speed of the car at photogate in cm/sec?
Ta on the data collector reads .0071 s after your energy car passes photogate A. What is the speed of the car at photogate in cm/sec?
140 cm/sec
1.00/.0071 = 140.85
The force of gravity acting on one kilogram on the earth is
The force of gravity acting on one kilogram on the earth is
9.8 newtons
Which of the following is not an OHS value:
Positive Attitude
Respect
Compassion
Integrity
Whining
Which of the following is not an OHS value:
Positive Attitude
Respect
Compassion
Integrity
Whining
Whining
What must be true of an object that has no net force acting on it? Answer with regards to the velocity of the object.
What must be true of an object that has no net force acting on it? Answer with regards to the velocity of the object.
moving at constant velocity
Make a rough sketch of a force vector diagram to determine in which direction the following object would travel.
10 N east
30 N North
15 N Northwest
40 N West
Answer with NE, NW, SE, or SW
Make a rough sketch of a force vector diagram to determine in which direction the following object would travel.
10 N east
30 N North
15 N Northwest
40 N West
Answer with NE, NW, SE, or SW
NW
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