February 6, 2014 Day 1 Science Starters Sheet 1. Please have these Items on your desk. I.A Notebook 2- Science Starter: Two Vocabulary Words: Motion Speed Agenda Density Lab

Definitions 2/6/14 Motion: The state in which one object’s distance from another is changing. Speed: The distance an object travels per unit of time.

To do list Hand back papers Go over density homework Update Table of Contents Physics Goal Sheet Notes Set up for tomorrow’s lab

T.O.C. Page 11 2/6 Physics Goal Sheet Pgs. 13,15,17 2/6 Motion&Speed Notes

Motion & Speed Motion A. Motion - when an object changes its position relative to a reference point. 1. Distance - how far an object has moved. 2. Displacement - distance and direction of an object’s change of position from a starting point.

B. Speed - distance an object travels per unit of time. 1. Rate - any change over time. Calculation for speed: speed = distance/time s = d t 2. Constant speed - that doesn’t change over time. Speed is usually not constant; usually an object has changing speed.

3. Average speed - of motion when speed is changing. Average speed = total distance total travel time As = td tt 4. Instantaneous speed - at any given point in time.

C. A distance-time graph displays motion of an object over time. 1. Plot distance on a vertical axis. (Y) 2. Plot time on a horizontal axis. (X) t Time Distance- time graph Distance

Speed Speed- the distance traveled divided by the time during which the motion occurred. Constant Speed- movement at a fixed distance per unit of time. –The same amount of distance is covered by the object in the same amount of time at each measurement of that same interval. Instantaneous Speed- is the velocity of an object at a certain time. –For example:- Suppose you are driving in a car with your father see the speedometer, its speed constantly varies, Because speedometer give speed at a particular moment of time.

Formulas How to calculate it Distance Time

Variables Expressed by Distance can be expressed in –km (kilometers), mi (miles), m (meters), ft (feet). Time can be expressed in –Hours, minutes, seconds, days. Speed can be expressed in –m/s (meters per second), c/s (centimeters per second), km/ hr (Kilometers per hour over seconds).

Determine which one is which D S T T A S

Calculate it GivenWork Answer T= D= S= ____ D ST D D= 20 laps *.5 miles D= 10 miles S = D/T S= 10 miles / 2 Hours 5 MPH ? 2 hours 10 miles

Calculate it GivenWork Answer _____ __ __________ T D DT D= S= T= S= 30 Meters/ 20 minutes S= 1.5 MPM 1.5 MPM ? 60 minutes D= S*T D= 1.5 MPM * 60 Minutes D= 90 meters

Calculate it GivenWork Answer _____ T D T D D= S= T= 15 Blocks ? S= 3 Blocks/ 5 Minutes S=.6 bpm.6 bpmT= D/S T= 15 Blocks/.6 kpm 25 minutes

Acceleration Acceleration- the rate at which velocity changes over time. –An object accelerates if it changes speed or direction.

Acceleration Formula Acceleration = Final speed- Starting speed Time it takes to change speed