PHYSICS 3A Lecture Notes - Lecture 6: One Direction

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22 Jan 2019

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PHYSICS 3A Lecture Notes - Lecture 6: One Direction

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Physics 3a - lecture 6 - kinematics in one dimension problems. *images and problems from (1d velocity speed; barwick, steven) Rank the paths according to the average velocity of the objects with the greatest first (use only the symbols > and =, for example 1>2=4>3: 1>2>3>4, 1>2=3>4, 1=2=3=4, 4>2=1>3, none of the above. A) 1, b) 2, c) 3, d) 4, e) never. A) 1. 2 m/s, b) 2. 4 m/s, c) 0. 83 m/s: 0. 9 m/s. Find the average velocity during the first. A) 4 m/s, b) 2 m/s, c) 1 m/s, d) 0. 5 m/s. A) 4 m/s, b) 3 m/s, c) 2 m/s, d) 1 m/s, e) 0 m/s. Find the instantaneous velocity at t = 2. 0. A) 0. 83 m/s, b) 1. 2 m/s, c) 1. 0 m/s, d) 2. 0 m/s. Find the instantaneous velocity at t = 9. 0s. A) 2 m/s, b) 1 m/s, c) 0. 7 m/s, d) 0. 5 m/s. Find the average velocity for the total trip.

Related Questions

Thisis a graph of a particle's position along an x axis versustime.

(a) At time t = 0, what is the sign of the particle'sposition? (Minus or plus)

(b) Is the particle's velocity positive, negative, or zero att = 1 s?

(d) Is the particle's velocity positive, negative, or zero att = 3 s?

(e) How many times does the particle go through the pointx = 0?

If a particle's position is given by x=4-12t+3t²( wheretis in seconds and x is in meters), what is its velocity att=1s?(b)Is it moving in the positive or negative direction of xjust then?(c) what is its speed just then? (d)Is the speedincreasing ordecreasing just then?(Try answering the next twoquestions withoutfurther calculation.) (e) is there ever aninstant when the velocityis zero? If so, give the time t; if not,answer no. (f) Is there atime after t =3s when the particle ismoving in the negativedirection of x? If so, give the time t; ifnot answer no.

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?