AST201H1 Chapter : AST— Jan 17 Lecture + Chapter Notes

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ivoryhedgehog777

29 Feb 2012

School

UTSG

Department

Astronomy & Astrophysics

Course

AST201H1

Professor

Michael Reid

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AST201H1 Full Course Notes

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How de we describe motion? y speed is the rate at which an object is moving. Acceleration is a change in velocity, meaning a change in either speed or direction. Sun: torque is the special type of force that can change an object s angular momentum ( twisting force ) How is mass different from weight? y an object s mass is the same no matter where it is located, but its weight varies with the strength of gravity or other forces acting on the object. How did newton change our view of the universe? y newton showed that the same physical laws that operate on earth also operate in the heavens, making it possible to learn about the universe by studying physical laws on. Inspired when he saw an apple fall to the ground y: realized that gravity making the apple fall was the same force that held the.

Related Questions

Match the following words with their descriptions:

1. Speed 2, Velocity 3, Acceleration 4. Force 5. Mass 6. Inertia

Rate at which an object covers a distance, disregarding direction.

Rate at which an object covers a distance in a given direction.

The tendency of objects to not change their state of motion unless acted on by an outside force.

Measure of the amount of matter in an object.

Rate at which an object changes its velocity.

A push or pull on an object, that when unopposed, results in a change in the object's state of motion.

ivoryllama613

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

Object A collides on a horizontal frictionless surface with an initially stationary target, object X. The initial and final velocities of object A are shown. The final velocity of object X is not given.

a). At an instant during the collision, is the net force on object A zero or non-zero?

b) [During the collision, is the momentum of object A conserved? Explain. Is the momentum of the system consisting of objects A and X conserved? Explain. On the same horizontal surface, object C collides with an initially stationary target, object Z. The initial speeds of objects C and A are the same, and m_x = m_z > m_A = m_c. After the collisions, object C moves in the direction shown and has the same final speed as object A. In the space below, copy the vectors v_C1 and v_cr with their tails together. Use these vectors to draw the change in velocity vector for glider C, Delta v_c. Is the magnitude of the change in velocity vector of object A greater than, less than, or equal to the magnitude of the change in velocity vector of object C? Explain? Is the magnitude of the change in the momentum vector of object A greater than, less than, or equal to the magnitude of the change in the momentum vector of object C? Explain? Is the final speed of object X greater than, less than, or equal to the final speed of object Z? Explain. Consider the following incorrect statement: Gliders A and C have some change in momentum. They have the same mass, and because they have the same initial speed and same final speed. Delta-v is the same for each of.them." Discuss the error(s) in the reasoning.

sangriaporcupine175

AST201H1 Chapter : AST— Jan 17 Lecture + Chapter Notes

AST201H1 Full Course Notes

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