Vectors
(a•b)=|a||b|cos(theta)
If instantaneous velocity is zero, what can you say about the slope of the position function
The slope must be zero.
What is the equation for friction?
f=mu*N
What is Newton's first law?
A body at rest remains at rest or, if in motion, remains in motion at constant velocity unless acted on by a net external force.
What are the units for Work?
Joules.
What is the cross-product equation?
(a x v)=|a||b|cos(theta)
What is the equation for range?
R=voxt
What is the difference between kinetic and static friction?
Static friction occurs before an object is in motion and kinetic friction occurs while an object is in motion.
What is inertia?
The ability of an object to resist changes in its motion.
What is the equation for Work?
Force times change in time.
What makes a vector different from a vector?
Vectors have direction
What can we say about vertical velocity when an object is at its maximum height?
The vertical velocity must be zero.
If an object is being pulled to the right, what direction is the force of friction?
To the left?
What is Newton's second law?
F=ma or acceleration is directly proportional to the net force and inversely proportional to mass.
What are the units for Power?
Watts.
Can the magnitude of a vector be negative?
If an object is undergoing centripetal motion and I increase the radius, what will happen to the acceleration?
Acceleration will decrease.
Does friction depend on the surface area of an object?
What is Newton's third law?
Whenever one body exerts a force on a second body, the first body experiences a force that is equal in magnitude and opposite in direction to the force that it exerts.
What is the equation for Power?
Change in Work over change in time.
If two vectors are equal, what can you say about their components?
Their components are equal.
A dime is placed at the edge of a table so it hangs over slightly. A quarter is slid horizontally on the table surface perpendicular to the edge and hits the dime head-on. Which coin hits the ground first?
They hit the ground at the same time.
Why does friction occur?
The rough microscopic surfaces on objects getting caught on each other.
A book rests on a level tabletop. Which force does Newton's third law imply is equal in magnitude but opposite in direction to the weight of the book?
The force of the book on the earth
If work is positive, what can be said about the change in kinetic energy?
The change in kinetic energy is positive, hence kinetic energy is increasing.