Newtons Laws Flashcards
How Many Newton’s Laws of Motion are there?
3
T/F: Newton’s laws are not absolute.
False. Newtons Laws are absolute. There are no exceptions.
What do Newton’s laws explain?
The motion of an object resulting from the forces acting on the object.
Newton’s First Law
If a body is at rest, it will remain at rest. If a body is moving with constant velocity, it will continue to do so unless acted upon by a net external force.
If an object is not ________________, it will continue to do so.
Accelerating
An object that is not _____________ and an object that is _____________ at a constant velocity are fundamentally __________________.
Moving; Moving; the same thing.
They are both NOT accelerating
What is a Force?
An interaction between two objects.
A force must be _____________.
External. It cannot come from us/within.
Forces act ____ an object.
ON
Forces are _____________ quantities. They can be _______________ or _________________.
Vectors. Positive; Negative
Net Force
The sum, or total of all forces acting upon an object
T/F When a body is at rest, it means that there are no forces acting upon it.
False. It means that all the forces are adding up to zero.
What external force allows us to walk and for a car to move?
Friction
Newton’s First Law is also referred to as what?
Law of Inertia
Inertia
The resistance of a body to change in its state of motion
Inertia is equal to what?
Mass measured in kg
The more _____________ an object is, the harder it is to change its state of motion.
Massive
Mass is a _________________ quantity
Scalar
Mass is totally independent of ________________.
Position (it is a scalar value)
Weight is a _______________ quantity.
Vector. It is positional dependent.
Conversion of Kg to Newtons
1 kg=9.8 N
Weight is a measure of _____________ attraction.
Gravitational
Weight (formula)
Fw=mg (Weight =mass * gravity)
What are 4 types of forces?
Weight (measure of gravitational attraction, Fw=mg)
Normal (applied by a surface perpendicular to the surface, Fn)
Friction (resistive due to the motion between two surfaces, Ff)
Tension (within ropes, strings, cables. Applied into the line and away from the object, Ft)
Newton’s Third Law
For every force that acts in nature, there must be an equal and opposite force. (for every action, there is an equal and opposite reaction)
According to Newton’s Third Law, when you push on a wall, what is the wall doing?
The wall is pushing back on you with a force equal in strength.
Why don’t action and reaction forces cancel each other out?
Because they act on different objects.
Newton’s Second Law
If an object is acted upon by a net external force, it must accelerate in the direction of the net force.
Net Force (equation)
Fnet=ma (net force=mass*acceleration)
