PHY 2053 Chapter Notes - Chapter 1-2: International System Of Units, Equations For A Falling Body, Hockey Puck

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viridiancaribou590

3 Aug 2017

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What is a particle model? represents a moving object as if all its mass were concentrated at a ingle point. What do speed and velocity both measure? distance over time. A vector has both ___________________ and ________________ magnitude, direction. What is acceleration? change in velocity over change in time. What are the common units of acceleration? m/s . What is the distance between speed and velocity? velocity contiamo information about the direction of motion while speed does not. What are the si units for distance, mass, and time? meters, kilograms, and seconds. Velocity vectors point in the same direction as ____________________ vectors. What are scalar quantities? have only magnitude and can be represented by a single number. What are examples of scalar values? temperature, time, and mass. What are examples of vectors? velocity and displacement. What is the rule for using significant figures while multiplying, dividing, and using powers? set by the value with the fewest significant figures.

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

A food particle from your breakfast takes a circuitous path through your digestive system. Suppose its motion over a period of time can be represented by the four displacement vectors depicted in the figure below. Let the vectors have magnitudes A = 7.8 cm, B = 17 cm, C = 22 cm, and D = 5.7 cm.

Part A: What is the magnitude of the total displacement of the food particle?

Part B: What is the direction of the total displacement of the food particle?

Part C: If the average speed of the particle is 0.010 mm/s, what is the magnitude of its average velocity over the time interval of the four displacements?

carminesheep38

A common graphical representation of motion along a straight line is the v vs. t graph, that is, the graph of (instantaneous) velocity as a function of time. In this graph, time is plotted on the horizontal axis and velocity on the vertical axis. Note that by definition, velocity and acceleration are vector quantities. In straight-line motion, however, these vectors have only a single nonzero component in the direction of motion. Thus, in this problem, we will call the velocity and the acceleration, even though they are really the components of the velocity and acceleration vectors in the direction of motion, respectively. Here is a plot of velocity versus time for a particle that travels along a straight line with a varying velocity. Refer to this plot to answer the following question.

What is the average acceleration of the particle over the first 20.0 seconds?

beigecrow871

PHY 2053 Chapter Notes - Chapter 1-2: International System Of Units, Equations For A Falling Body, Hockey Puck

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