Unit 3- Forces Flashcards
Forces are represented by _____
Vectors
The overall force acting on an object after all forces are combined
Net Force
Forces are measures in ______
Newtons (N)
1 Newton represents….
1 kg x 1m/s^2
Forces are measured using a…..
spring scale
Forces that are opposite in direction and equal in size
Balanced force
Net force of balanced forces
0
The net force is NOT 0 in an….
unbalanced force
in which an object changes speed, direction, or both
acceleration
Force that opposes motion between 2 surfaces when they are in contact
Friction
Rough surfaces have (more, less) friction
more
more force= (more, less) friction
more
Force that keeps an object at rest
static friction
force that opposes the motion of an object as it slides over a surface
sliding friction
force that acts on rolling objects
rolling friction
force that opposes the motion of an object through a fluid (liquids & gases)
fluid friction
Gravity causes objects to accelerate ______
Downward
______ opposes the force of gravity
Air resistance
Acceleration of any object (without air resistance) on Earth
9.8 m/s^2
Falling faster (increases, decreases) air resistance
increases
the point at which gravity = air resistance
terminal velocity
Terminal velocity depends on ____, _____, and _____ of the object
size, shape, mass
force of attraction between any 2 objects in the universe
force of gravity
force of gravity increases as mass (increases, decreases) and distance (increases, decreases)
increases, decreases
The amount of matter in an object
Mass
Force of gravity acting on an object
Weight
Newton’s First Law
an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by a force
The tendency of an object to resist any change in motion
Inertia
Newton’s Second Law
F=ma
Force= mass x acceleration
Newton’s 3rd Law
When an object exerts a force on a second object, the second object exerts an equal but opposite force on the first.
Quantity of motion that is dependent in both mass and velocity
Momentum
Formula for Momentum
p=mv
p=momentum
m=mass
v=velocity
The total momentum in a group of objects does not change unless outside forces act on the objects
Law of Conservation of Momentum
A push or a pull that one object exerts on another
Force
