FIVE FACTS ON ACCELERATION If an object is speeding up we say that it is accelerating. If an object is slowing down we say that it is decelerating.

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Presentation transcript:

FIVE FACTS ON ACCELERATION If an object is speeding up we say that it is accelerating. If an object is slowing down we say that it is decelerating. Acceleration tells us how many metres per second its speed increases by every second. Acceleration = change in velocity time Acceleration is measured in metres per second squared (m/s 2 ).

QUESTION 1 A carrot’s speed increases from 5 m/s to 20 m/s in a time of 3 seconds. What is the carrot’s acceleration ? Acceleration = change in velocity time Acceleration = 15 / 3 Acceleration = 5 m/s 2

QUESTION 2 A mouse slows down from 70 m/s to 30 m/s in 4 seconds. What is the deceleration of the mouse? Acceleration = change in velocity time Acceleration = - 40 / 4 Acceleration = - 10 m/s 2

QUESTION 3 A small cauliflower falls in a tragic manner. If the acceleration due to gravity is 10 m/s 2, what is the speed of Mr. Cauliflower after 4.5 seconds ? Change in velocity = acceleration x time Change in velocity = 10 x 4.5 Change in velocity = 45 m/s

ACCELERATION QUESTIONS! 1.A fly called Gerald accelerates from 12 m/s to 18 m/s in 0.25 seconds, calculate his acceleration. 2.A car accelerates from rest to a velocity of 22 m/s in a time of 5 seconds. What is the acceleration of the car? 3.A meteorite decelerates from m/s to 0 m/s in 0.1 seconds. Calculate the deceleration of the meteorite. 4.If a formula one car accelerated at 20 m/s2, how fast would it be moving after 6 seconds? 5.If a space craft travelling at 3500 m/s accelerates at 3000 m/s 2 for 0.5 seconds, what is it’s new speed?