Measuring an objects motion

 Speed is calculated by dividing distance by time  S = d/t  5.0 km/h  2.5 m/s  45 mph

 Velocity is the same as speed, but you tell the direction of motion in the answer.  v = d/t direction  5.0 km/h north  2.5 m/s forward  45 mph backwards

 Find the velocity of a swimmer who swims exactly 110 m toward the shore in 72 seconds.  v= ?  d= 110 m  t= 72 s  v = d/t  v = 110 m / 72 s  v = 1.5 m/s forward

 Find the velocity of a baseball thrown 38 m from third base to first base in 1.7 s.  v= ?  d= 38 m  t= 1.7 s  v = d/t  v = 38 m / 1.7 s  v = 22 m/s to first base

 Calculate the distance in meters a cyclist would travel in 5.00 hours at an average velocity of 12.0 km/h southwest.  v= 12.0 km/h  d= ? m  t= 5.00 h  d = vt  d = 12.0 km/h X 5.00 h  d = 60 km  d = 60, 000 m

 Calculate the time in seconds an Olympic skier would take to finish a 2.6 km race at an average velocity of 28 m/s downhill.  v= 28 m/s  d= 2.6 km (2,600 meters)  t= ? s  t = d/v  t = 2600 m / 28 m/s  t = 93 s

 Acceleration measures the change in velocity.  Acceleration is measured in d/t 2.  45.7 m/s 2 forward

Natalie accelerates her skateboard along a straight path from 0 m/s to 4.0 m/s in 2.5 seconds. What is her average acceleration? V i = 0 m/s V f = 4.0 m/s ∆t = 2.5 s a = ?

A turtle swimming in a straight line toward shore has a speed of 0.50 m/s. After 4.0 s, its speed is 0.80 m/s. What is the turtle’s acceleration? V i = 0.50 m/s V f = 0.80 m/s ∆t = 4.0 s a = ?

Marisa’s car accelerates at a rate of 2.6 m/s 2. Calculate how long it takes her car to accelerate from 24.6 m/s to 26.8 m/s. V i = 24.6 m/s V f = 26.8 m/s ∆t = ? a = 2.6 m/s 2