15 terms

# Physical Science Ch. 5 Sec. B

Hamilton Christian Academy - Mrs. Rougeau
###### PLAY
inertia
What property of matter makes it want to continue to move indefinitely unless acted upon by an outside force?
Newton, Galileo
Who proposed the laws of motion and whose work did he base his studies on?
Objects at rest tend to remain at rest and objects in motion tend to remain in motion unless acted upon by a force
Newton's first law of motion is known as the law of inertia, what does this law state?
Mechanical equilibrium
When the net force on a system is zero there is no motion and the system is said to be in a state of what?
The acceleration of a system is directly proportional to the force and inversely proportional to the mass, F = ma
Newton's second law is the law of accelerated motion, what does this law state and what is the formula that goes along with the law?
F = net force, m = mass, a = acceleration
In the formula for accelerated motion, what do the variables mean and what are the units for each variable?
For every action there is an equal but opposite reaction
Newton's third law is the law of action-reaction, what does this law state?
Friction
What is a contact force that opposes the movement of objects past each other?
Perpendicular to the surface
In what direction is the "normal" force on a system?
Static (between stationary objects), kinetic (sliding objects), rolling (rolling object and stationary surface), fluid (moving object immersed in a fluid)
List and explain the four types of friction.
Contact
Friction always occurs between systems in what?
Materials
Friction depends on the kind of what in contact?
Opposite direction
The friction vector acts in what direction with respect to the system's motion?
Normal force
The magnitude (amount) of friction is proportional (increases / decreases as the other increases / decreases) to the what acting on the system?
Moving past each other
There is greater friction between two stationary (still) objects than when they are what?