Forces Flashcards
What is a force
Push or pull that allows us to stop moving, maintain direction or maintain balance
equation for force
force= mass x acceleration
how are forces represented
by vectors- showing magnitude and direction
tensile forces
pulling forces acting on the ends of an internal structure (e.g. muscles onto tendons onto bones)
compressive forces
pushing forces acting on the ends of an internal structure (e.g. bones onto cartilage onto bones)
examples of contact forces
other objects in direct contact
ground reaction force
friction
air resistance
examples of non-contact forces
gravity
electromagnetic forces
what are collinear forces
forces with the same line of action acting in the same or opposite direction
what is resultant force
vector addition of two or more forces
net force
vector addition of all the external forces acting on an object
what are concurrent forces
forces that act through the same point of application but not on the same line
Newton’s first law of motion
inertia- every body continues in a state of rest or uniform motion unless acted upon by an external force
what is linear momentum and how is it calculated
determines how hard it is for an object to change velocity
momentum= mass x velocity
Newton’s second law of motion
acceleration- external forces cause acceleration
acceleration= force/momentum
Newton’s third law of motion
action and reaction- to every action there is an equal and opposite reaction
