Speed & Velocity LEQ: How can equations be used to describe the

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Presentation transcript:

Speed & Velocity LEQ: How can equations be used to describe the motion of an object? Objective: Given appropriate information, calculate the speed or velocity of an object (including units). Speed & Velocity

Motion Motion is described relative to something else An object can be described as moving or not moving at the same time depending on what is used as the reference frame

Speed Speed is a quantity that describes how an object moves Speed is the rate at which distance is covered, and it is measured in units of distance divided by time.

Speed Instantaneous speed is the speed at any instant Could be determined by looking at speedometer Could be measured with a radar gun Could be calculated using equations (initial or final speed) or graphs

Speed Average speed is the total distance covered divided by the time interval

Speed Possible speed units: mi/hr m/s ft/min d = distance s = speed t = time Possible speed units: mi/hr m/s ft/min

Speed d s= t Speed and distance are directly related.

Speed d s= t Speed and time are inversely related.

Speed d=sxt

Speed d s= t

Speed d t= s

Calculations 1. A football player can run from end-zone to end-zone, a distance of 100 yards, in 15.0 seconds. What is his average speed during this run?

Calculations 2. A family begins a vacation by driving 85 miles east, starting in Hanover. This part of the trip took 1.5 hours. What is the average speed for this trip?

Calculations 3. How long would it take a cheetah to run 75 m running at 25 m/s?

Calculations 4. A greyhound can run 160 m in 10 s. What is the speed of this animal?

Calculations 5. How far can a turtle travel in 30 s walking at 1 cm/s?

Velocity Velocity is speed together with direction Velocity is constant only when speed and direction are both constant Velocity is a vector quantity… having both magnitude (size) and direction

Velocity http://www.teachersdomain.org/resources/phy03/sci/phys/mfw/accel/index.html http://www.teachersdomain.org/asset/phy03_int_accel/