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Physics 20: Dynamics
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Gravity
January exam
Terms in this set (16)
Newton's First Law
When a body experiences no net external force it either:
Stays at rest (static equilibrium)
Continues it's motion with constant velocity (dynamic equilibrium)
Newton's Second Law
A net external force acting on a body causes it to change momentum with time according to : F = dP/dt
So mass and/or velocity may change
If mass is constant F = ma
Newton's Third Law
When two objects interact, the forces they exert on each other are equal in magnitude and opposite in direction
Friction
The force between the object and the surface that attempts to reduce the movement of one relative to the other.
terminal velocity
the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
Kepler's First Law
The orbit of each planet around the Sun is an ellipse with the Sun at one focus.
Kepler's Second Law
A line connecting the planet to the sun sweeps
out equal areas (in the plane of the orbit) in equal times
Kepler's Third Law
The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
balanced forces
produces no change in the motion of an object and the net force is equal to zero
unbalanced forces
When the net forces on an object are greater than 0. Unbalanced forces cause a change in velocity and therefore, cause acceleration.
Force of Gravity
The weight of an object
Force of gravity perpendicular
The force that equal the Normal force
Force of gravity parallel
The force that accelerates the object down the slope
Force of friction
The force that slows the movement of the object
Force Normal
The force that the surface exerts on the object
Inertia
The tendency of an object to resist a change in motion
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