3 Speed vs. Velocity Velocity – SI unit m/s plus direction Speed - SI unit m/sVelocity – SI unit m/s plus directiondistance traveled divided by the time interval during which the motion occurredspeed of an object in a particular direction
4 Acceleration – pg. 514rate at which velocity changes over time; an object accelerates if its speed, direction, or both change.a = v2 – v1/ t
5 Force – SI unit N – pg. 517a push or a pull exerted on an object in order to change the motion of the object; force has size and directionnet force – combination of all the forces acting on an objectbalanced force – when the forces on an object produce a net force of 0 N
6 copy question & answer in notebook How is velocity different from speed?How does the direction of the net force on a object compare to the direction of its motion?How does a net force of 0 N impact an object’s motion?
7 Friction – pg. 521a force that opposes motion between two surfaces that are in contact
9 Gravity – pg. 527a force of attraction between objects that is due to their masses
10 mass affects gravitational force – pg. 528 distance affects gravitational force – pg. 529
11 weight vs. mass weight mass measure of the gravitational force exerted on an objecta measure of the amount of matter in an object
12 Newton’s 1st law of motion An object at rest remains at rest, and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force.
13 Newton’s 2nd lawThe acceleration of an object depends on the mass of the object and the amount of force applied.F = m x aa = F/m
14 Newton’s 3rd lawWhen one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
15 Momentuma quantity defined as the product of the mass and velocity of an objectp = m x v
16 Science math equations to know speedaverage speed = total distance / total times = d / tNewton’s 2nd lawForce = mass x accelerationF = m x aaccelerationaverage acceleration = final velocity – initial velocity / timea = v2 – v1 / tmomentummomentum = mass x velocityp = m x v