7 Physics 6A Energy

# 7 Physics 6A Energy - Physics 6A Work and Energy examples...

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Unformatted text preview: Physics 6A Work and Energy examples Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB 1) A boy exerts a force of 11.0N at 29.0 degrees above the horizontal on a 6.40kg sled. Find the work done by the boy and the final speed of the sled after it moves 2.00m, assuming the sled starts with an initial speed of 0.500m/s and slides horizontally without friction. Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB 1) A boy exerts a force of 11.0N at 29.0 degrees above the horizontal on a 6.40kg sled. Find the work done by the boy and the final speed of the sled after it moves 2.00m, assuming the sled starts with an initial speed of 0.500m/s and slides horizontally without friction. 29° F=11N Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB 1) A boy exerts a force of 11.0N at 29.0 degrees above the horizontal on a 6.40kg sled. Find the work done by the boy and the final speed of the sled after it moves 2.00m, assuming the sled starts with an initial speed of 0.500m/s and slides horizontally without friction. 29° F=11N Initially the sled is moving at 0.5 m/s, so its kinetic energy is: ( 29 ( 29 J 8 . 5 . kg 4 . 6 mv K 2 s m 2 1 2 2 1 = = = Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB 1) A boy exerts a force of 11.0N at 29.0 degrees above the horizontal on a 6.40kg sled. Find the work done by the boy and the final speed of the sled after it moves 2.00m, assuming the sled starts with an initial speed of 0.500m/s and slides horizontally without friction. 29° F=11N Initially the sled is moving at 0.5 m/s, so its kinetic energy is: ( 29 ( 29 J 8 . 5 . kg 4 . 6 mv K 2 s m 2 1 2 2 1 = = = Next we can find the work done by the boy’s pull, and add that to the kinetic energy. Remember – work always equals the change in the kinetic energy. Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB 1) A boy exerts a force of 11.0N at 29.0 degrees above the horizontal on a 6.40kg sled. Find the work done by the boy and the final speed of the sled after it moves 2.00m, assuming the sled starts with an initial speed of 0.500m/s and slides horizontally without friction. 29° F=11N The force is not aligned with the motion, so we need to use the x-component to get the work. ( 29 ( 29 ( 29 ( 29 J 24 . 19 m 2 29 cos N 11 W d cos F W = ⋅ ° ⋅ = ⋅ θ ⋅ = Initially the sled is moving at 0.5 m/s, so its kinetic energy is: ( 29 ( 29 J 8 . 5 . kg 4 . 6 mv K 2 s m 2 1 2 2 1 = = = Next we can find the work done by the boy’s pull, and add that to the kinetic energy. Remember – work always equals the change in the kinetic energy. Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB 1) A boy exerts a force of 11.0N at 29.0 degrees above the horizontal on a 6.40kg sled. Find the work done by the boy and the final speed of the sled after it moves 2.00m, assuming the sled starts with an initial speed of 0.500m/s and slides horizontally without friction. 0....
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7 Physics 6A Energy - Physics 6A Work and Energy examples...

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