184.108.40.206 velocity is a vector quantity,the magnitude of velocity is called speed.
220.127.116.11 Vave = delta x / delta t
18.104.22.168 average velocity and instantaneous velocity
1.1.4 Newton's Law
22.214.171.124 Newton's First Law: If the total force acting on an object is zero, the
object will maintain its velocity forever.
126.96.36.199 Newton's Second Law: In many situations,
several different forces act on an object
simultaneously. the total force on the object is the sum of these individual forces. The acceleration of an object with mass m is given by: a = F / m.
188.8.131.52 When one object exerts a force on a second object, the second object exerts a force
of the same magnitude and opposite direction on the first object.
184.108.40.206.1 all action come in action-reaction pairs.
2 Chapter 3: Forces and Motion in One Dimension
2.1 Part 1: constant acc. equations of motion, normal forces and weight, free body diagrams
2.1.1 Motion Along a Line
220.127.116.11 (Vfx)=(Vix) + (Ax)(T)
18.104.22.168 X= (Vix)(T) + (1/2) (Ax)(T)^2
22.214.171.124 (Vfx)^2= (Vix)^2 + (2)(Ax)(X)
2.1.2 Normal Force
126.96.36.199 Acts perpendicularly to the plane of contact
188.8.131.52 Apparent Weight= Normal Force
2.1.3 Free Body Diagram
184.108.40.206 Used for analysis using Newton's 2nd Law
220.127.116.11 Opposes the Motion
18.104.22.168 Kinetic Friction: F(friction)= (coefficient of kinetic friction) x N (normal force)
22.214.171.124 Static Friction: F (friction)= less than/ equal to= (coefficient of static friction) x N (normal force)
2.2 Part 2: free fall motion, Newton's 2nd Law applications
2.2.1 Free fall motion
126.96.36.199 any object which once projected or dropped continues in motion by its own inertia and is influenced only by the down force of gravity
188.8.131.52 object always has acceleration of gravity: 9.8 m/s^2
184.108.40.206 the ideal "cord" has zero mass, does not stretch, and tension is the same throughout the cord
3 Chapter 4
3.1 Ch4.1 static
3.1.2 When forces are balanced their is no acceleration in the system
220.127.116.11 this is called static equilibrium
18.104.22.168 Which also means if there is no acceleration the is no un-balanced force F-net=0
3.2 Projectile Motion
3.2.1 X-component of velocity is always constant in projectile motion unless friction force is present.
3.2.2 The Y-component of velocity is always zero at its peak hieght
22.214.171.124 Always acted on by gravity if going up (negative acceleration) if going down (positive acceleration)
3.2.3 Range: is the total distances the object can cover in the X-direction
126.96.36.199 can be calculated by taking the X-component of the velocity and multiplying it by 2x the
time it takes an object to reach its peach in (not including height differences or dead drops)