Laws
Newton's 1st Law is also referred to as the law of _______
Inertia
What do the variables in the below equation represent?
F = ma
F = force
m = mass
a = acceleration
What is the force of gravity?
The force of attraction between two objects
The center of gravity
What is the study of Dynamics?
The study of WHY objects move
The law of acceleration refers to which of Newton's laws of motion?
Newton's 2nd Law
F = ma
If a large ball and a small ball are hit with the same force, what is true of their acceleration?
The smaller ball will experience greater acceleration than the larger ball
Why can't you feel the gravitational force between you and your text book?
The gravitational force between us and the Earth is so much stronger that it makes that force insignificant.
T/F: The center of mass will always be at the exact center of an object
False!
This depends on the distribution of mass within the object
Why do a feather and a brick fall at the same speed on the moon?
There is no atmosphere/air on the moon, so no air resistance to slow down the feather. Objects fall at the same speed regardless of their mass due to the acceleration of gravity
Newton's 3rd Law is also known as the law of ______ and ______
The Law of Action and Reaction
Which 2 factors impact the strength of gravitational force between 2 bodies?
The mass of each object, and the distance between them
How does the gravitational force of the moon affect us?
It pulls on the bodies of water on Earth and causes tides
Where is the center of mass for a human?
Above the waist - it is higher for boys than girls!
What is terminal velocity?
The maximum speed of a falling object. This limit is due to air resistance preventing acceleration from increasing past a certain point.
What is the Law of Universal Gravitation?
Any two bodies attract each other with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them
OR: Any two bodies attract each other depending on how much mass they have, and how close together they are.
F = G x (m1 x m2)/d2
Moving an object 9 times further to another object would do what to the force of gravity (F)?
a. F would be 9 times smaller
b. F would be 9 times stronger
c. F would be 3 times smaller
d. F would be 3 times stronger
d. F would be 3 times smaller
F is inversely related to the square of the distance. If the objects are 9 times further apart, their gravitational force would be 3 times weaker
Which would experience the stronger force of gravity:
A 20kg ball and a 200kg boulder that are 4 meters apart OR
A 10kg ball and a 30kg boulder that are 4 meters apart?
The first option - The larger masses means the force of gravity is stronger. The distance is the same in both options.
What would happen if you tried to form a human pyramid without each person knowing where their center of mass is located?
The pyramid would likely topple over if each person did not properly "stack" their center of mass
No - this is due to the first law of motion. The inertia of the heavier ball would be greater than the light ball, so friction would not slow it down as quickly as the light ball.