What is a force?
a push or pull first exerting force on a second
The overall force of an object after all of the forces are added together.
Unbalanced forces can do three things. What are they?
3. Cancel each other out
Equal forces acting on one object in an opposite directions.
When you add equal forces exerted in opposite directions, the net force is _____.
What is Newton's First Law of Motion?
An object at rest will remain at rest, and an object that is moving at constant velocity will continue moving at constant velocity unless acted upon by a unbalanced force.
Newton's First Law of Motion is also called....
The Law of Inertia
What is mass?
The amount of matter in an object.
How can mass be defined in terms of inertia?
Mass can be defined as a measure of the intertia of an object.
What is Newton's Second Law of Motion?
The net force of an object is equal to the product (addition) of its acceleration and mass.
What is the equation that describes the relationship among quantities of force, mass, and acceleration.
Force=Mass x Acceleration
What equation for Newton's second law can you use to find accleration?
Accleration=Force divided by Mass.
How does an increase of force affect acceleration?
An increase of force causes an increase in acceleration.
What are two ways you can increase the acceleration of an object?
You can change the force and change the mass.
How does an increase fo mass affect accleration?
An increase of mass decreases acceleration?
What two factors does friction depend on?
1. The types of surfaces involved
2. How hard the surfaces push together
What direction does friction go?
Opposite to the object's direction.
What kind of friction requires more force to overcome?
The force that pulls objects towards earth?
When is an object said to be in free fall?
When the only force acting upon it is gravity.
What is acceleration due to the force of gravity?
9.8 m/s squared
An object that is thrown.
Air Resistance is...
Objects falling through the air (fluid friction).
The greater surface area of an object, the greater the ________.
What is terminal velocity?
The greatest velocity a falling object reaches
What is weight?
The force of gravity on an object at the surface of a planet.
How is weight different than mass?
Weight is the measure of the force of gravity and mass is a measure of the amount of matter in a object.
Weight is measured in ________.
What does the universal law of gravitation state?
The force of gravity acts between all objects in the universe.
The force of attraction varies with what two factors?
Mass + Distance
What is Newton's third law of motion?
If one objects exerts a force on another object, then the second object exerts a force of equal magnitude in the opposite direction of the first object.
The force exerted by the first object on a second object.
The force exerted by the second object back on the first object?
Forces can only be added together if...
they are acting on the same object
The product of an objects mass and velocity is
What is the equation you use to determine momentum?
mass x velocity
What is the unit of measure for momentum?
kg x m/s
What of the law of conversation of momentum state?
The total momentum of the objects that interact does not change.
Momentum is ______, but ________ to the other object.
What is Newtons 2nd law of motion?
the net force on an object is the product of its acceleration and its mass.
What is Newtons 1st law of motion?
an object at rest will remain at rest and an object in motion will remain in motion unless the object is acted upon by an unbalanced force.
What is newtons 3rd law of motion?
everytime there is an action force on an object the object will exert an equal and opposite reaction force.
Do action/reaction forces cancel out?
No because they are acting on two different objects.
What does momentum count on?
a greater mass or velocity
Momentum: Two moving objects
Momentum: One moving object
Transfered from one to another
Two connected objects
Velocity divided in half