PCS 120 Study Guide - Midterm Guide: Circular Motion, Kinematics

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7 Oct 2017

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Together, kinematics and dynamics form the branch of physics known as mechanics. Types of motion: moving in a straight line means constant velocity: motion in a straight line (translation motion, motion in a curved line (projectile moiton, motion in a circular path (circular motion, rational motion. Trajectory: the path along which an object moves. Motion diagram: composite photo showing an object"s position at several equally spaced instants of time. (uniform motion-with constant speed) Coordinate system: it is an official grid we place over problems motion diagaram in order to analize the motion. Orientation of the coordinate system: x and y axis. Time: t=0 and that"s when we start our clock and monitor and object"s motion. Before t=0, object may have moved, but it is our beginning of solving the problem. Independent on the coordinate system and the path travelled. Average speed does not include information about direction of motion. Velocity is a vector and it changes in two ways:

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.

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An object that moves along a straight line has the velocity-versus-time graph shown in the figure below. At time t = 0, the object has position x = 0.

a. At time t = 5 s, is the acceleration of the object positive, negative, or zero?

b. At time t = 8 s, is the object speeding up, slowing down, or moving with constant speed?

c. Write an expression for the position of the object as a function of time.

d. Use your expression from part (c) to determine (if any) at which the object reaches its maximum position.

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PCS 120 Study Guide - Midterm Guide: Circular Motion, Kinematics

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