PHYS 101 Study Guide - Final Guide: Drag Racing, Parallelogram, Projectile Motion

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PHYS 101 Full Course Notes

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Chapter 2 describing motion: kinematics in one dimension. Mechanics: study of the motion of objects, and the related concepts of force and energy, can be divided into two parts. Dynamics: deals with force and why objects move as they do. Point particle: mathematical point and to have no spatial extent (no size) can only undergo translational motion. Particle model is useful when the object"s size is not so significant. Any measurement of position, distance or speed must be made with respect to a reference frame or frame of reference. Example: a person walks toward the front of a train at 5 km/h. 80 km/h with respect to the ground, so the walking person"s speed relative to the ground is 85km/h. In physics, we often draw a set of coordinate axes to specify the direction of the motion and to represent a frame of reference. In three dimensions a z-axis perpendicular to the x and y axes is added.

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

Two objects move with initial velocity -8.00 m/s, final velocity 16.0 m/s, and constant accelerations. (a) The first object has displacement 20.0 m. Find its acceleration. (b) The second object travels a total distance of 22.0 m. Find its acceleration

14.82 CP An interesting, though highly impractical example of oscillation is the motion of an object dropped down a hole that extends from one side of the earth, through its center, to the other side. With the assumption (not realistic) that the earth is a sphere of uniform density, prove that the motion is simple harmonic and find the period. [Note: The gravitational force on the object as a function of the object's distance r from the center of the earth was derived in Example 13.10 (Section 13.6). The motion is simple harmonic if the acceleration at and the displacement from equilib- rium x are related by Eq. (14.8), and the period is then T = 27/.]

PHYS 101 Study Guide - Final Guide: Drag Racing, Parallelogram, Projectile Motion

PHYS 101 Full Course Notes

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