amount of matter in an object; force of gravity on an object
100
Which scientist viewed the Earth as a motionless object?
Aristotle
100
What did Galileo say kept objects from moving forever?
friction
100
What is inertia?
resistance of an object to change its motion
100
If a woman has a mass of 50 kg, calculate her weight in newtons.
490 N
200
SI unit for mass? weight?
kg; N
200
Which scientist argued for a heliocentric model? a geocentric model?
Copernicus; Aristotle
200
How much force is necessary to keep a ball moving in space?
none, force is not necessary for motion when fiction is absent
200
T/F Newton's law of inertia applies only to objects in motion.
F; also objects at rest
200
Calculate in newtons the weight of a 2000 kg elephant.
19600 N
300
Describe the difference in mass and weight based upon location.
mass in property that doesn't change; weight will vary depending on gravity
300
Why was Copernicus so reluctant to share his ideas?
feared prosecution from scholars and Church
300
A ball rolls down an incline of 10 m How high does it roll up the next incline assuming there is no friction?
10 m
300
Objects at rest..., objects in motion..., unless acted on ....
tend to stay at rest, stay in motion, by an outside force
300
An apple weighs about 1 N. What is the mass in kg
0.1 kg
400
T/F Mass is not a measure of inertia
F
400
Describe motion as Aristotle viewed it.
natural (up/down) or violent
400
What did Newton invent? say about motion of planets?
differential calculus; plants orbit in ellipses
400
Explain why your odds of escaping a crazy elephant are increased if the elephant moves in a zigzag pattern rather than straight toward you.
Elephant's mass increases his inertia; running in a zigzag would affect his ability to keep up with you because he has to constantly change direction which is harder b/c of his mass
400
Susie Small weighs 300 N on the moon. Find her mass if gravity on the moon is 1/6 that on Earth.
183.7 kg
500
What is the value of acceleration due to gravity?
9.8 m/s2
500
How did Aristotle's views of motion last for thousands of years?
His views coincided with scripture; credibility from nobility
500
How do you think Newton's first law led to the second two?
500
Explain how mass and/or speed affects inertia
mass increases inertia; speed does not (think of equation)
500
Which has more mass, a kilogram of bananas or a kilogram of feathers?