Chapter 4 Force And Motion Concepts Flashcards
Forces that arise from physical contact between two objects
Contact forces
A push or a pull
Force
Forces that two objects exert on one another even though they are not touching
Non contact forces
Action at a distance forces
Measure of amount of stuff something is composed of
Mass
A resistance in any change of motion
Inertia
What is Newton’s first law of motion
An object at rest will stay at rest and an object in motion will maintain a constant velocity unless acted upon by an unbalanced force
Is motion a force
No
When is newtons 1st law invalid
Inertial reference frame
If an object has a constant velocity is there acceleration?
No
What is Newton’s second law of motion
When a net external force acts on an object of mass, the resulting acceleration is directly proportional to the net force and the magnitude is inversely proportional to the mass
Direction of a = direction of net force
What equation is Newton’s second law represented by
EF = ma
Forces that the environment exerts
External forces
Forces that one part of an object exerts on another part of the object
Internal force
What type of force is included in Newton’s second law
External forces
Diagram that represents the object and the forces that act upon it
Free body diagram
What is Newton’s third law of motion
For every action (force) there is an equal but opposite reaction
What is significant about the action and reaction forces in Newton’s third law
Their magnitudes are ALWAYS equal
Are the accelerations of the action and reaction forces always equal?
No bc each force could act on a different object containing a different mass
Force component perpendicular to the surface
Normal force
Force parallel to the surface
Frictional force
Which force is greater? Static or kinetic?
Static
are horizontal and vertical forces dependent on each other?
No!
The state at which an object has no acceleration
Equilibrium
What is newtons law of universal gravitation
Every particle in the universe exerts an attractive force on every other particle
