Unit 3

Question 1

center of gravity

Answer 1

is the point at which the entire weight of a body may be considered to be concentrated.

Question 2

why does normal force changes on a horizontal surface vs. an inclined surface

Answer 2

Because is always perpendicular with the surface

Question 3

projectile

Answer 3

an object that is launched through the air (2 dimensional motion)

Question 4

trajectory

Answer 4

the path the projectile takes

Question 5

are horizontal and vertical motion impendent or dependent on a projectile

Answer 5

independent Perpendicular components of vectors do not affect each other, which allows us to easily analyze the motion of projectiles.

they have no effect on each other

Question 6

centripetal acceleration

Answer 6

acceleration (or change in velocity) twoards the center of a circle

Question 7

centripetal force

Answer 7

pull on an object twards the center of a circle

Question 8

How could an object traveling at a constant speed in a circle be changing its velocity and acceleration?

Answer 8

With uniform circular motion, the acceleration is constantly changing due to the change in direction of the velocity, not the change in magnitude of the velocity.

Question 9

force of gravity

Answer 9

attraction force (pull) that exists between any two objects

Question 10

gravity as an attraction force between two objects

Answer 10

more mass= more force

more desistance/Furter away= less force

Question 11

why do astronauts float in space

Answer 11

because even though they are free falling but the velocity is pushing to the side so fast that they float