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T.H. The Professional Development Service for Teachers is funded by the Department of Education and Skills under the National Development Plan The Equations of Motion 1

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PDST Resources for Leaving Certificate Physics 2 Q. 1 A car is moving at a velocity of 25 m s –1. It accelerates at a rate of 6 m s –2. Find its velocity after 3 seconds.

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PDST Resources for Leaving Certificate Physics 3 Ans. 1 Use the no s equation: A car is moving at a velocity of 25 m s –1. It accelerates at a rate of 6 m s –2. Find its velocity after 3 seconds. ANSWER

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PDST Resources for Leaving Certificate Physics 4 Q. 2 An object is dropped from rest. Calculate its velocity after 2.5 seconds if it is dropped: (a) on earth, where the acceleration due to gravity is 9.8 m s –2 (b) on mars, where the acceleration due to gravity is 3.8 m s –2 ?

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PDST Resources for Leaving Certificate Physics 5 Ans. 2 Note: when an object is dropped from rest, its initial velocity is 0. (a) (b)

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PDST Resources for Leaving Certificate Physics 6 Q. 3 A motorbike is travelling with a velocity of 3 m s –1. It accelerates at a rate of 9.3 m s –2 for 1.8 seconds. Calculate the distance it travels in this time.

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PDST Resources for Leaving Certificate Physics 7 Ans. 3 A motorbike is travelling with a velocity of 3 m s –1. It accelerates at a rate of 9.3 m s –2 for 1.8 seconds. Calculate the distance it travels in this time. ANSWER

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PDST Resources for Leaving Certificate Physics 8 Q. 4 A Tesla Roadster car accelerates from rest at a rate of 7.1 m s –2 for a time of 3.9 s. Calculate the distance it travels in this time.

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PDST Resources for Leaving Certificate Physics 9 Ans. 4 A Tesla Roadster car accelerates from rest at a rate of 7.1 m s –2 for a time of 3.9 s. Calculate the distance it travels in this time. ANSWER

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PDST Resources for Leaving Certificate Physics 10 Q. 5 A bullet accelerates at a rate of m s –2 from rest. Calculate its velocity if it travels a distance of 0.5 m while accelerating.

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PDST Resources for Leaving Certificate Physics 11 Ans. 5 A bullet accelerates at a rate of m s –2 from rest. Calculate its velocity if it travels a distance of 0.5 m while accelerating. ANSWER

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PDST Resources for Leaving Certificate Physics 12 Q. 6 An aircraft is travelling along a runway at a velocity of 25 m s –1. It accelerates at a rate of 4 m s –2 for a distance of 750 m before taking off. Calculate its take-off speed.

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PDST Resources for Leaving Certificate Physics 13 Ans. 6 An aircraft is travelling along a runway at a velocity of 25 m s –1. It accelerates at a rate of 4 m s –2 for a distance of 750 m before taking off. Calculate its take-off speed. ANSWER

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PDST Resources for Leaving Certificate Physics 14 Q. 7 A car is travelling at a speed of 21 m s –1. It accelerates at an average rate of 3 m s –2 for a time of 4 seconds. Find the distance it travels during the 4 seconds.

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PDST Resources for Leaving Certificate Physics 15 Ans. 7 A car is travelling at a speed of 21 m s –1. It accelerates at an average rate of 3 m s –2 for a time of 4 seconds. Find the distance it travels during the 4 seconds. ANSWER

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