7. Introduction to Forces, Dynamics, & Newton's Law of MOtion

Question 1

Dynamics

Answer 1

Is the connection between kinematics and forces

Question 2

Force

Answer 2

Is a push or pull; an action capable of moving an object; measured in Newtons.

Question 3

Force also has a new unit known as the

Answer 3

Newton [N]

Question 4

Newton’s First Law of Motion is also known as…

Answer 4

Law of Inertia

Question 5

Law of Inertia

Answer 5

An object in motion remains in motion along a straight line path until an unbalanced force acts upon that object.

An object at rest remains at rest until a force acts upon that object.

Question 6

Inertia

Answer 6

Tendency of an object to maintain its state of rest or uniform motion.

Question 7

Mass

Answer 7

A measure of the amount of stuff of an object. (kg)

Question 8

Weight’s Unit

Answer 8

F_g

Question 9

Weight [F_g]

Answer 9

A force that represents the mass time gravity

Question 10

Equation for Weight

Answer 10

F_g = mg

Question 11

Newton’s Second Law of Motion is also known as…

Answer 11

[F=ma]

Question 12

Newton’s Second Law of Motion [F=ma]

Answer 12

The acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to its mass.

The direction of the acceleration is in the direction of the net force acting on object.

Question 13

Symbol of Sigma

Answer 13

Σ

Question 14

Σ [Sigma] means…

Answer 14

“The sum of”

Question 15

Symbol of Net Force and what it means…

Answer 15

ΣF= (the sum of all the forces added together)

Question 16

Hooke’s Law

Answer 16

“for relatively small deformations of an object, the displacement or size of the deformation is directly proportional to the deforming force or load. Under these conditions the object returns to its original shape and size upon removal of load.”

Question 17

Spring constant

Answer 17

When an object is stretched or compressed by a force. The object exerts a force back that is equal to the distance stretched times something known as S…C…, but opposite in direction.

Question 18

Explain F_spring= -kx

Answer 18

-k > Spring constant

x > Distance stretched

Question 19

Can k be zero?

Answer 19

Technically No

Question 20

Can k be negative?

Answer 20

NO!!!

Question 21

Newton’s Third Law is also known as…

Answer 21

action-reaction

Question 22

Newton’s Third Law [action-reaction]

Answer 22

Whenever an object exerts a force on a second object, the second object exerts an equal and opposite force in the first object.

“To every action there is an equal and opposite reaction”

Question 23

Free Body Diagram

Answer 23

To analyze the forces on an object we start with this concept.

(this are the arrows indicating the forces upon the object)

Question 24

Unit of Spring constant [-k]

Answer 24

N/M

Question 25

Normal Force is represented by the symbol…

Answer 25

Fn