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Force
push or pull
Net force
the combination of forces acting on an object
Balanced forces
no movement, net force = 0
Un-balanced forces
movement in stronger direction
Scientific Law
a statement or mathematical description of phenomenom
Book Issac Newton made?
Principia
Laws Issac Newton made?
Universal Law of Gravity, 3 Laws of Motion.
Newton’s 1st Law name
Law of Inertia
Newton’s 1st Law
an object at rest tends to stay at rest and an object in motion stays in motion unless acted on by an unbalanced force
Inertia
tendency to resist a change in motion.
Inertia increase how on mass?
more mass = more inertia
Mass
the amount of matter in an object
Newton’s 2nd Law
The acceleration of an object depends on the mass of the object and force applied
Force Equation?
F = ma
Force units?
Newtons (N)
Mass equation
mass = f/a
mass units?
kilograms (kg)
acceleration equation
a = f/m
acceleration units
ms/²
Third law
for every action there is an equal and opposite reaction
Gravity
the force of attraction between objects
Friction
a force that is exerted when two surfaces rub against each other, forces push opposite ways
gravity increased/decreased by?
bigger mass = more gravity
small mass = less gravity
further = less attraction (gravity)
closer = more attraction (gravity)
friction amt decided by?
roughness of surface, rougher = more friction, less rough = less friction.
static friction
friction on non moving objects
sliding friction
when two solid surfaces slide over eachother
Rolling friction
when an object rolls across a surface on wheels
Fluid friction
friction through a fluid
momentum definition
a characteristic of a moving object
velocity
speed in a given direction
momentum equation
momentum = mass x velocity
momentum units
kg x M/s² + direction
mass units
kg
what direction momentum go
direction that the velocity goes
more inertia
more momentum
3 examples of friction
ice rink has less friction making us slide when walk, dragging a box across floor making it harder to move it on rough carpet, walking on baseball field with baseball cleats, giving us much more friction.
