Impulse -01- Change in Velocity

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A ball of mass 0.2 kg is thrown with a velocity of 50 m/s at an angle of 30° from the horizontal. Using the concept of impulse, find the change in velocity in 3 s.  #impulse #momentum #collision

Transcript

00:00Hi friends, learning is the key to unlocking the door to success.

00:06Make every lesson an opportunity to grow and develop.

00:12One method of learning is to find the answer to a question.

00:17In this series, we will calculate the change in velocity using the concept of impulse.

00:25Let's discuss.

00:28A ball is thrown from the ground at an angle of 30 degrees.

00:33Of course the ball will go through a parabolic path.

00:39Why is that?

00:40Apparently the mass is attracted to the center of the earth by the force of gravity.

00:47Along the path, the ball gets a vertical gravitational force downward.

00:52In fact, the force causes acceleration.

00:56With another time, the ball moves accelerated downward.

01:00Meanwhile, in the horizontal direction, there is no force at all.

01:05The speed in the horizontal direction will not change.

01:09Indirectly, this question asks us to calculate the change in velocity in the vertical direction.

01:18We know that impulse is related to average force.

01:22J is the same as F t.

01:26On the other hand, impulse is also a change in momentum.

01:30J is the same as m delta V y.

01:35In V there is a subscript y as a marker for the direction of velocity.

01:42Compare the two equations.

01:46The force of gravity is the multiplication of mass and the acceleration due to gravity.

01:54It seems we can cross out the value of m.

02:00Delta V y is equal to g t.

02:03We can see the value from the problem sheet.

02:09The result is 30 meters per second.

02:12The direction of the impulse is in the same direction as the force.

02:19Since the direction of gravity is downward, we can give a minus sign to indicate that

02:24the impulse is also downward.

02:32Happy learning everyone!

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