37239 Lecture Notes - Kinematics

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kpatil

4 Mar 2023

School

UC-Davis

Department

Physics

Course

PHY9A

Professor

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Document Summary

Velocity is a term used in physics to describe the rate at which an object changes its position. It is a vector quantity, which means it has both a magnitude and a direction. The magnitude of velocity is the speed of an object, while the direction is the direction in which the object is moving. Velocity is often confused with speed, but they are not the same thing. While speed only describes how fast an object is moving, velocity describes both the speed and the direction of motion. Velocity can be calculated using the formula: velocity = displacement/time where displacement is the change in position of the object and time is the duration over which the displacement occurs. If an object is moving in a straight line at a constant velocity, its velocity can be determined by measuring the displacement and the time it takes to travel that distance.

Related Questions

1. What is the difference between speed and velocity?

a. Speed is an average quantity while velocity is not.

b. Velocity contains information about the direction of motion while speed does not.

c. Speed is measured in mph, while velocity is measure in m/s.

d. The concept of speed applies only to objects that are neither. speeding up or slowing down, while velocity applies to every kind of motion.

e. Speed is used to measure how fast an object is moving in a straight line, while velocity is used for objects moving along curved paths.

2. The quantity 2.67 x 10³ has how many significant figures?

3. If Libby walks 100 m to the right, then 200 m to the left, her net displacement vector points

a. to the right.

b. to the left.

c. has zero length.

d. cannot tell without more information.

4. Velocity vectors point

a. in the same direction as displacement vectors.

b. in the opposite direction as displacement vectors.

c. perpendicular to displacement vectors.

d. in the same direction as acceleration vectors.

e. velocity is not represented by a vector.

chocolatemouse942

I. v = +2.0 m/s, Δt = 2.0 s

II. v = +3.0 m/s, Δt = 2.0 s

III. v = -3.0 m/s, Δt = 2.0 s

Which option ranks the displacement of there objects in decreasing order?

a. I, II, III

b. II, III, I

c. II, I, III

d. III, II, I

11. Which of these defines acceleration? Choose the correct answer.

a. the change in velocity

b. the change in displacement

c. change of velocity over time

d. the rate of change of displacement

12. An object moves at a constant speed in the direction of the arrow.

Which of these describes the object's movement? Choose the correct answer.

a. positive velocity

b. negative velocity

c. positive acceleration

d. negative acceleration

mariabran12

The speed of an object and the direction in which it moves constitute a vector quantity known as the velocity. An ostrich is running at a speed of 16.8 m/s in a direction of 67° north of west. What is the magnitude of the ostrich's velocity component that is directed in the following directions?

37239 Lecture Notes - Kinematics

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