Kinematics and Dynamics

Question 1

Dot product

Answer 1

When multiplying two vectors to get a scalar

A•B=|A||B|cosθ

Question 2

Cross product

Answer 2

When multiplying two vectors to get vector

AxB= |A||B|sinθ

Question 3

Vector Addition

Answer 3

The resultant vector of A+B is the same as B+A

Question 4

Vector Subtraction

Answer 4

Resultant vector of A-B has same magnitude as B-A but oriented in the opposite direction

Question 5

Displacement

Answer 5

A change in position in space. It is a vector quantity, with magnitude and direction

Question 6

Velocity (m/s)

Answer 6

It is a vector. It’s magnitude is measured as the rate of change of displacement in a given unit of time. Direction is the same as the direction of the displacement.

Question 7

Speed

Answer 7

Rate of actual distance traveled in a given unit of time.

Question 8

Force (N=(Kg•m)/s^2)

Answer 8

A vector quantity, experienced as a push or pull on objects, and can exist on objects that are not touching

Question 9

Gravitational Constant (G)

Answer 9

6.67x10^-11 (N•m^2)/kg^2

Question 10

Static Friction

Answer 10

Exists between stationary object and the surface it rests.
0<=fs<=μsN
Always larger then kinetic friction, and dissipates as you get an object in motion

Question 11

Kinetic Friction

Answer 11

Exists between a sliding object and the surface over which the object slides. Always present when there is sliding of two surfaces, so always constant unlike static friction.
fx=μkN

Question 12

Mass

Answer 12

Measure of a bodies inertia, the amount of matter in the object. A scalar quantity; independent of gravity.

Question 13

Weight

Answer 13

Measure is gravitational force on an objects mass. It is a vector because it is a force.

Question 14

Acceleration (m/s^2)

Answer 14

The rate of change of velocity that an object experienced as a result of some applied force. A vector quantity

Question 15

Newton’s first law

Answer 15

A body at rest or in motion with constant velocity will remain that way unless a net force acts upon it. Law of Inertia.
Fnet=ma=0

Question 16

Newtons Second Law

Answer 16

An object of mass m will accelerate when the vector sum of the forces results in some nonzero resultant force vector.
Fnet=ma

Question 17

Newtons Third Law

Answer 17

To every action, there is always an opposed but equal reaction. Law of action and reaction.

Question 18

Linear motion

Answer 18

Objects velocity and acceleration are along the line of motion so the pathway of the moving object continues along a straight line

Question 19

Kinematics (no displacement)

Answer 19

v=vo+at

Question 20

Kinematics (no final velocity)

Answer 20

x= vot + (at^2)/2

Question 21

Kinematics (no time)

Answer 21

v^2=vo^2+2ax

Question 22

Kinematics (no acceleration)

Answer 22

x=vt

Question 23

Projectile motion

Answer 23

Motion that follows a path along two dimensions.

Question 24

Incline planes (force components)

Answer 24

Fg parallel=mgsinθ

Fg perpendicular=mgcosθ

Question 25

Circular Motion

Answer 25

Occurs when forces cause an object to move in a circular pathway.
Fc=(mv^2)/r

Question 26

Uniform circular motion

Answer 26

Motion that contains instantaneous velocity vector tangent to the circular paths with centripetal force pointing radially inward. Constant speed/velocity

Question 27

Translational motion

Answer 27

Occurs when forces cause an object to move without any rotation

Question 28

Rotational motion

Answer 28

When forces are applied against an object in such a way as to cause the object to rotate around a fixed pivot point (fulcrum)

Question 29

Torque

Answer 29

Generates rotational motion
τ=rxF=rFsinθ
Clockwise rotation=negative
Counterclockwise rotation=positive