Studied by 2 people
formula for momentum
p=mv
What does conservation of momentum mean
If 2 objects collide, the momentum before the collision is equal to the momentum after the collision
What is the formula for the conservation of momentum
m1v1 + m2v2 = m1v1 +m2v2
How is force defined?
A push or a pull
What is net force
The sum of all forces acting on an object
If the net force is zero
The forces are balanced and the object is at rest
If the net force IS NOT zero
The forces are unbalanced and the object is accelerating
What is the result of balance forces on an object
object is either not moving or moving with constant velocity
What is the result of an unbalanced force on an object
the object is accelerating
State the metric unit for force with its abbreviation.
Newton (N)
Net force formula
F=ma
Static friction
occurs when objects are in contact but not moving
Sliding friction
occurs when objects are in contact and sliding
Rolling friction
occurs when objects are in contact and rolling (such as wheels)
How would you recognize an unbalanced force acting on an object?
the object would be accelerating
How would you recognize a balanced force acting on an object?
the object is either moving or not moving with a constant velocity
Types of free body diagram forces
gravity, normal, friction, applied, air resistance, tension or spring
What is weight
the gravitational force exerted on an object
Formula for weight
W=mg
How is weight different from mass
Mass is the amount of matter in an object, weight depends on mass and gravity
Value for Earth's gravitational strength
9.8m/s^2
Newton's First Law
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
If the forces on an object are balanced, what does it say about the motion of the object
It will remain at rest until an unbalanced force acts on it
What is interia
The tendency of an object to resist a change in motion
Do all objects have inertia?
Yes
How does the mass of the object affect its inertia?
Greater the mass, the greater the inertia
Do all objects resist changes in motion
Yes
Briefly explain how inertia works by passenger in a car
The car is traveling down the road at 50 mph, and the passengers are moving at the same speed. If it stops suddenly, the people will continue to fly forward until acted upon by an outside force, like a seatbelt
Netwon's second law
The unbalanced force acting on an object is equal to the object's mass times its acceleration (F=ma)
Does the 2nd law deal with balanced or unbalanced forces? Or both?
Unbalanced forces
According to the 2nd law, if I apply a force on an object what should it do
The mass won't change, but the object will accelerate
Newton's Third Law
For every action there is an equal and opposite reaction
4 facts about the 3rd law
Forces act in pairs
Forces are the same size but in opposite directions
Forces do not act on the same object
Forces occur at the same time
Note
Flashcard