3. Newtons Laws of Motion Flashcards
the study of how forces affect the
motion of objects and systems.
Dynamics
Two main factors need to be addressed to answer questions about why the motion of an object will change
- Forces acting on the object.
- The mass of the object.
Vector force: has ___ and ___
magnitude and direction
a resultant force acting on object
Net Force
Newton’s laws relate force to (3)
acceleration, motion and mass of the body.
What law: If an object does not interact with other objects, it is possible to identify a reference frame in which the object has zero acceleration.
It defines a special set of reference frames called inertial frames. We call this an ___
Law of Inertia
inertial frame of reference.
Property of an object that specifies how much resistance of an object
exhibits to changes in its velocity
Mass
the tendency of the body to resist
motion or changes in motion.
Inertia
Types of Inertia
Inertia of Rest
Inertia of Motion
Inertia of Direction
What is the 2nd Law?
The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This is often expressed as the formula:
𝐹=𝑚⋅𝑎
F is the net force applied,
m is the mass of the object, and
a is the acceleration produced.
Example: Pushing a lighter object (like a toy car) will make it accelerate more than pushing a heavier object (like a real car) with the same force.
What is the 3rd Law?
Action and Reaction Law:
For every action, there is an equal and opposite reaction. (example: boat)
Types of Forces:
Weight
Tension
Normal Reaction
Friction/Air resistance
TOF:
The magnitude of the gravitational force acting on an object of mass m
near the Earth’s surface is called the weight w of the object: w = mg
Weight
the point where the force of
gravity acts on the object.
Center of Gravity
point where the mass of the body is considered to be located
Center of Mass
