Motion
When an object's distance to another object changes over time, that object is said to be:
In motion
What happens when two forces act in the same direction?
They add together
Total distance traveled divided by the total time is:
Average Speed
The force of gravity on a person or object on the surface of a planet is called
Weight
Newton's ______ Law: An object at rest stays at rest, and an object in motion stays in motion at a constant velocity unless acted upon by an unbalanced force.
First
Balanced forces _________ change an object's motion.
Do not
What type of a force is air resistance
(Fluid) Friction
Speed in a given direction:
Velocity
A place or object used for comparison to determine if something is in motion is called:
A reference point
The achievement of lifting a rocket off the ground and into space can be explained by which of Newton's Laws
Newton's THIRD Law
The greater the mass of the object, the _________ the inertia.
Greater
The law of universal gravitation states that any two objects in the universe, without exception, ___________ ______ ________.
Attract each other
Name one way to increase acceleration.
Increase Force; Decrease Mass
Speed that does not change is referred to as __________ speed.
Constant
According to Newton's third law of motion, when a hammer strikes and exerts force on a nail, the nail does this:
Exerts an equal force back on the hammer.
When the only force acting on a falling object is gravity, the object is said to be
In free fall
As the distance between two objects increases, the gravitational force between them ____________.
decreases
Changing direction is an example of a kind of
Acceleration
The property of matter that resists a change in motion is called:
Inertia
The product of an object's mass and acceleration is called
Force
A person traveling in a car that stops suddenly keeps moving forward due to _____________.
Inertia
Friction acts in a direction __________ to an object's direction of motion.
Opposite
To determine the acceleration rate of an object, you must calculate the change in velocity divided by:
Time
The overall force on an object after all forces are added together is called the _______ force.
Net
What equation describes Newton's Second Law
Force = Mass x Acceleration