Particle Kinematics

Question 1

What are the properties of a particle?

Answer 1

Negligible dimensions and rotation

Question 2

What is Kinematics?

Answer 2

Discipline of mechanics that deals with the motion of particles over time without reference to the forces that cause displacement, velocity and acceleration of the particle.

Question 3

What is a scalar quantity?

Answer 3

Defined only by amount or magnitude.

Question 4

What is a vector quantity?

Answer 4

Magnitude; Direction

Question 5

What are the types of plane motion?

Answer 5

Rectilinear; Curvilinear

Question 6

What is displacement?

Answer 6

Amount of change in position

Question 7

What is the magnitude of displacement?

Answer 7

Distance

Question 8

If the displacement is not 0…

Answer 8

The particle is moving.

Question 9

What is velocity?

Answer 9

Rate of change of the position

Question 10

What is the formula for velocity?

Answer 10

Delta X/ Delta T

Question 11

What is the magnitude of velocity?

Answer 11

Speed

Question 12

If the velocity is changing then…

Answer 12

the particle is accelerating

Question 13

If the velocity of a particle is constant…

Answer 13

then its speed AND direction does not change

Question 14

What is the rate of change of the velocity of a particle?

Answer 14

Acceleration

Question 15

What is the formula for acceleration?

Answer 15

A= delta v/delta t

Question 16

What did Aristotle believe?

Answer 16

All motion on earth is linear. Heavens–curved. Two balls of different weights fall at different rates. Natural tendency of massive objects to seek the center of the earth.

Question 17

What did Galileo do?

Answer 17

Performed studies on the acceleration of spherical bodies.

Question 18

Why is it that objects do not always fall at the same time?

Answer 18

Friction

Question 19

Who developed mechanics?

Answer 19

Newton

Question 20

What are Newton’s Laws of Motion?

Answer 20

Inertia, Acceleration, Action-reaction

Question 21

What is a projectile?

Answer 21

an object upon which the only force acting is GRAVITY

Question 22

A projectile is any object which was once thrown which…

Answer 22

continues in motion by inertia; influenced only by gravity

Question 23

What are the two components of projectile motion?

Answer 23

Horizontal and vertical

Question 24

Max range? Max elevation?

Answer 24

45 deg. and 90 deg.

Question 25

What is uniform circular motion?

Answer 25

Motion of an object in a circle with a constant or uniform speed

Question 26

For circular motion what is the formula for Avg. Speed?

Answer 26

Avg. Speed = 2pi r / t

Question 27

Does velocity equal speed?

Answer 27

No

Question 28

An object moving along a circle…(in terms of direction)

Answer 28

Constantly changes direction

Question 29

What is the velocity where magnitude is constant but direction is changing?

Answer 29

Tangential velocity

Question 30

Explain how despite constant speed, an object in circular motion is still accelerating?

Answer 30

Acceleration is change in velocity NOT speed

Question 31

What is acceleration directed inwards?

Answer 31

Normal acceleration

Question 32

What is the equation for normal acceleration?

Answer 32

An = v^2 / r

Question 33

What does normal acceleration account for?

Answer 33

Change in direction NOT magnitude

Question 34

What does tangential acceleration account for?

Answer 34

Change in magnitude

Question 35

What is the “center seeking” force?

Answer 35

Centripetal force

Question 36

What is required for objects to move in circles?

Answer 36

Since objects usually travel in straight lines, you need the presence of an UNBALANCED FORCE

Question 37

What are the requirements for centripetal force?

Answer 37

Friction, Tension and Gravity

Question 38

Centripetal force for uniform circular motion alters ______ without altering ______

Answer 38

Direction without altering speed

Question 39

What is the motion with respect to another moving reference?

Answer 39

Relative motion