Distance V Displacement

• DISTANCE: The length of a path between two points• DISPLACEMENT: Direction from a

starting point and the length of a straight line from the starting point to the ending point.

Displacement

What is distance, displacement?

Displacement

• http://physics.info/displacement/

A. Add the magnitudes of two displacement vectors that have the same direction.

B. Two displacement vectors with opposite directions are subtracted from each other.

Combining Displacements

START FINISH

• #6, 11.2 Speed and Velocity

• V = Total Distance/Total Time• V = (1.5 km + 0.5 km) / (25 min + 5 min)• V = 2 km / 30 min• V = 2 km / .5 h• V= 4 km/h

Average Speed # 11 (130)

•Average Speed = Total Distance / Total Time•A: 200 / 4 = 50 m/s•B: 100 / 10 = 10 m/s

Velocity• Velocity change may be the result

of a change in speed, direction, or both.• If a boat is moving at a constant

speed and changes direction, although the speed has not changed the velocity has changed because it changed direction.

Acceleration

•5, 131:•Each second an object is in a free fall, its velocity increases by 9.8 m/s•4 X 9.8 = 39.2 m/s

Acceleration

• Acceleration = Change in Velocity (vf-vi) /

Total Time (t)• 10 (132)• 4 – 1 / 3 = 1 m/s

Acceleration

• 15 (132)

•Acceleration = (vf –vi) / t• (0 m/s – 5 m/s) / 10 s• -5 / 10 = -0.5 m/s

Newton’s Laws

• http://teachertech.rice.edu/Participants/louviere/Newton/law1.html