Physics Problems on Velocity, Position, and Newton's Laws, Slides of Engineering Physics

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1.7 Velocity

• Average vs instantaneous
• Position update docsity.com

Q1.7.a A bee flies in a straight line at constant speed. At 15 s after 9 AM, the bee's position is < 2, 4, 0> m. At 15.5 s after 9 AM, the bee's position is < 3, 3.5, 0> m.

What is the average velocity of the bee?

1. < 6, 7, 0 > m/s
2. < .193, .225, 0 > m/s
3. 2.236 m/s
4. < 0.500, -0.250, 0 > m/s
5. < 2.000, -1.000, 0 > m/sdocsity.com

At 12.18 s after 1:30 PM, a ball's position is < 20, 8, -12> m, and the ball's velocity is < 9, -4, 6 > m/s.

What is the (vector) position of the ball at 12.21 s after 1:30 PM? Assume that the ball's velocity does not change significantly in this short time interval.

1. 24.75 m
2. < 20.27, 7.88, -11.82 > m
3. < 0.27, -0.12, 0.18 > m
4. < 129.62, -40.72, 61.08 > m
5. < 129.89, -40.84, 61.26 > m

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The change in velocity ∆v of an object is zero over a time interval ∆t.

Which of the following must be true. The object must:

1. be at rest.
2. have constant acceleration over the interval.
3. have constant velocity over the interval.
4. have zero average acceleration over the interval.
5. have zero average velocity over the interval.

Clicker Quiz

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Clicker Quiz

If a sattelite orbits in a circular path at the same speed. Is it’s momentum changing?

1. Yes
2. No docsity.com

1.4 Newton’s First Law of Motion

An object moves in a straight line and at

constant speed except to the extent that it

interacts with other objects.

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