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https://www.youtube.com/watch?v=Gg0TXN Xgz-w https://www.youtube.com/watch?v=rEKGTq 3onIo When an object change position over time relative to a reference point, the object is in MOTION Is the DISTANCE traveled by and object divided by the TIME taken to travel that distance SPEED depends on DISTANCE and TIME Actual Speed Average speed SPEED depends on DISTANCE and TIME - What is your average speed is you take 0.5 h to jog 4 000 m? - If the average speed of a car is 110 km/h, how long will it take the car to travel 715 km? VELOCITY and SPEED The VELOCITY is constant only if the speed and direction don’t change (straight line) The VELOCITY changes only if SPEED OR DIRECTION changes. Both cars have the same SPEED, but different VELOCITY COMBINING VELOCITY Person’s resultant velocity 14 m/s Two velocities that are in opposite directions REMEMBER WHY! 16 m/s Two velocities that are in the same direction Person’s resultant velocity COMBINING VELOCITY 14 m/s Two velocities that are in opposite directions 15 m/s east = 14 m/s east 1 m/s west 15 m/s east – 1 m/s west = 14 m/s east SPEED and ACCELERATION Acceleration is the rate at which velocity changes TRY IT! Acceleration is not only how much velocity changes but also how fast velocity changes. The faster the velocity changes, the greater the acceleration is. T or F?? 1. 2. 3. If you slow down on your bicycle, you accelerate If you ride your bicycle at a constant speed, you cannot accelerate Changing the speed and changing the direction of your bicycle are both example of acceleration Diagram the following situations: 1. 2. 3. You are riding your bike at 9 km/h. Ten minutes later, your speed is 6 km/h You ride your bike around the block at a constant speed of 11 km/h You ride your bike in a straight line at a constant speed of 10 km/h The NET FORCES on an object tells you whether the forces on an object are balanced or unbalanced Unbalanced Forces: necessary to cause a nonmoving object to star moving READING: 124 – 133 HOMEWORK NEXT WEEK : 134 – 135 WORKBOOK: 86 – 98 (MID TERM HOMEWORK)
