chapter 2 Flashcards
Force
any push and pull acting on an object
Inertia
Is the tendency for objects to resist a change in motion until an unbalanced force occurs
Friction
is a force that opposes motion
Air resistance
is a type of friction that occurs when air particles push back against an objects motion
mass
characteristic; amount of matter an object has
weight
a downward pull on an object connected to gravity
Newton’s first law
If an object is at rest it will stay at rest until it is acted upon by an unbalanced force and an object in motion will stay in motion until it is acted upon by a balanced force.
Newton’s 2nd law
an object’s acceleration is directly proportional to the force applied
Newtons 3rd law
When an object exerts a force on a second object; there is a reaction force that is equal in magnitude and opposite in direction
Every action has an equal and opposite reaction
sliding friction
when two objects slide across each other, sliding friction resists motion
static friction
acts on an object that is motionless ( this friction is typically stronger)
Rolling Friction
acts on objects such as wheels or balls or other circular objects
what is the difference between mass and weight?
mass (kg): is characteristic is the amount of matter an object has
weight (N): a downward pull on an object connected to gravity (9.81)
mass is a characteristic and weight is a force.
Free body diagram
is a sketch that scientists use to label all of the forces acting on an object
F(d)=1/2PV2C(d)A what do the letters stand for?
F(d)=drag force/air resistance
P=air density
V=velocity
C(d)=Drag coefficient
An area of the object
