SPEED & MOTION… The Basic Definitions Needed!
SPEED: This refers to any distance travelled, over a specified unit of time. � Common units are kilometres per hour (km/h) and metres per second (m/s) � The race car is travelling at 257 km/h � The jogger is moving at 5. 2 m/s RATE: This is different to speed, as it refers to how quickly an action can be completed, within a certain time frame. (Not Distance & Time) �I can eat 3 donuts in a minute � I read 15 words a second � He can do 75 push ups in 1 minute.
VELOCITY? Driving from Sydney to Newcastle, along the Freeway at 110 km/h. Your speed is ______, but your velocity is __________. At the same time, a friend is driving to Sydney (from N’castle) at 110 km/h. Their speed is ______, yet their velocity is ___________. VELOCITY IS _________________________________________
SPEED EQUALS…. We use a simple equation to find speed, as long as we have distance and time. DISTANCE TRAVELLED TIME TAKEN SPEED = Again, we can use the triangle to create three separate equations.
Speed = Distance/Time = Distance/Speed Distance = Speed x Time. DISTANCE TIME 140 km 2 hours 360 km 60 km/h 3. 5 hours 2500 km 100 m SPEED 110 km/h 120 km/h 10. 56 s