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100
What is the full definition of a force
A push or pull that changes an objects motion
100
What is the exact speed of a car that travels 90 meters in 9 seconds
10 m/s
100
a non-zero net force would be.... balanced or unbalanced?
unbalanced
100
A car is going from 55 mph to 76 mph. Are the forces in the car balanced or unbalanced?
unbalanced
100
what is the unit for mass
kg or grams
200
What is the unit for force
Newtons
200
what increases an objects inertia
mass
200
What does it take to change the motion of an object?
a force (unbalanced force)
200
give two specific names of forces we have talked about in class. "the force of..."
Force of gravitiy Force of friction normal force
200
what was the difference between the path the low mass marble took vs the path the high mass marble took in activity #79 "inertia around a curve"
None, the path taken was the same and was straight out of the track. the high mass marble however had more mass, therefore more interia and "resisted" the friction from the carboard a little more then the low mass
300
What is the definition of inertia
resistance of an object to change motion objects in motion stay in motion unless acted on by a force objects at rest stay in rest unless acted on by a force
300
Why does an object in motion not stay in motion on earth? does this contradict Newtons laws?
no, because the law says objects in motion stay in motion unless acted on by a force, and on earth the forces that act on an object are friction and gravitiy
300
Could a car traveling at a constant speed ever be experiencing an acclereration?
Yes, if it is changing direction, it would then be changing its velocity, which is the definition of an acceleration
300
What is newtons first law called and what does it tell us
law of inertia an object in motion stays in motion unless acted on by a force
300
Identify the center of mass in the diagram on the board
B
400
Identify the center of volume on the diagram on the board
C
400
if you go from 8m/s to 20 m/s in 2 seconds. What is your acceleration?
change in velocity = 20-8 = 12m/s time = 2 m/s Acceleration 12/2 = 6m/s2
400
what are the two factors of momentum?
mass and velocity
400
Give an example of an action/reaction force pair
action force- foot applying a force to a soccer ball reaction force- ball applying a force back on foot
400
What is the difference between speed and velocity
speed tells you how fast something is going, and velocity tells you how fast something is going AND in what direction
500
true or false, and explain with an example an object that is moving could be experiencing no change in motion
True, the object could be moving at a constant speed
500
what is the time of your trip if you travel 180 miles at a speed 60mph
3 hours
500
In activity #79 "Inertia Around a Curve," Why did the marble continue to travel in a straight line upon leaving the circular track?
There was no longer a force from the circular track pushing the ball, keeping it in a circular path so the ball followed its interia and went straight out of the track
500
If an object is accelerating.... is it? or could it be zero or non zero net force balanced or unbalanced? non-moving? traveling at a constant speed? slowing down?
non zero balanced must be moving (changing speeds) could actually be moving at a constant speed if changing direction slowing down
500
Draw a distance time graph where.... A car moves at a constant speed away from home, stops, and then moves in the opposite direction toward home at the same speed
graph should have Y-axis labeled distance, and X axis labeled time The graph should start with a straight upward slope, then a straight horizontal line, folowed by a downward slope.