Constant speed

A Data Table constant velocity Time 0 sec Position 1 meter Velocity = dist/time & direction 1 sec 2 meters 1 m/s to right 2 sec 3 meters 3 sec 4 meters

Position-Time Graphs Distance (ft) Vs. Time (sec.) Distance in Feet Time in Seconds 0 1 2 3 4 5 6 7 8 9 40 120 160 200 80 Describes the Rate of Change in Position of an Object Over Time

Position-Time Graph Distance (ft) Vs. Time (sec.) The constant slope indicates that the speed of the object remains constant Distance in Feet Time in Seconds 0 1 2 3 4 5 6 7 8 9 40 120 160 200 80 The Slope of this Line Remains Constant Throughout the Graph

Position-Time Graph The Speed of This Object Changes Over Time Distance (ft) Vs. Time (sec.) Distance in Feet Time in Seconds 0 1 2 3 4 5 6 7 8 9 40 120 160 200 80 The Speed of This Object Changes Over Time C B The Object is Accelerating A Speed @A = 5 ft/sec Speed @B = 24 ft/sec Speed @C = 50 ft/sec

Changes in Velocity Velocity changes in both these cases. 10 m/s, downward 25 meters per second, 45 degrees upward 25 m/s, downward 25 meters per second, 45 degrees downward

Interpret The Graph Below:

Balanced vs Unbalanced forces

Momentum P = mv *Depends on what two things? a. Mass b. Velocity Units – kg. m/s, direction

1. Two hockey players, big Joe and little Tim collide head on and get tangled while going for the puck. 65 kg Tim was travelling at 9.5 m/s while 105 kg Joe was moving at 5.2 m/s. Who will go in which direction, and what is their momentum before the collision?

Interpret The Graph Below:

Interpret The Graph Below:

Interpret The Graph Below:

Acceleration a= v/t a=acceleration,v=velocity =change, t=time *Change in velocity divided by the time interval in which the changed occurred Units - m/s2, direction

A missile was released from an airplane at the velocity of 78 km/hr south and ended up traveling at a velocity of 104 km/hr south. It took the missile 1 hour to reach the target. Find the missile’s acceleration. 1.What do they want to know? 2. Which formula do I use. 3. Plug in the numbers.

A dog runs with an initial speed of 1.5 m/s on a waxed floor. It slides to a stop with an acceleration of -.35 m/s2 . How long does it take for the dog to stop?

A football player likes to practice knocking the other players of their feet. He has a mass of 624.8 kg and created a momentum of 3124 kg. mph as he flatten a teammate. What was his velocity when he hit his teammate? 1.What do they want to know? 2. Which formula do I use. 3. Plug in the numbers.

YouTube - smart car crash

Force Cause of acceleration, or change in an object’s velocity F = ma, units – N, newtons 1 newton = .225 lb

Net force Combination of all of the forces acting on an object

Gravity & Friction Gravity Attraction of two particles of matter due to their mass Mass & Distance effects it 9.8 m/s2 Friction Force between two objects in contact that opposes the motion of either object

Explain what is happening

Weight Elevator

Is your weight the same on earth as it is on the moon? Is your mass the same on earth as it is on the moon?

Mr. Dovzak Mr. Dovzak