Chapter 4: The Laws of Motion 

The British scientist ________, who lived from 1642 to 1727, published a set of three rules in 1687 that explained how forces and motion are related.

________: an attractive force between any two objects that depends on the masses of the objects and the distance between them.

On the ________, the gravitational force on the astro- naut is less than it is on Earth.

________: Anything thats thrown or shot through the air.

When all forces except gravity acting on an a falling object can be ignored, the object is said to be in ________.

________: the tendency of an object to resist a change in its motion.

________: describes action- reaction pairs this way: When one object exerts a force on a second object, the second one exerts a force on the first that is equal in strength and opposite in direction.

________ is one of the four basic forces.

the tendency of an object to resist a change in its motion

states that the acceleration of an object is in the same direction as the net force on the object, and that the acceleration can be calculated from the following equation

an attractive force between any two objects that depends on the masses of the objects and the distance between them

gravitational force = (constant) x (mass 1) x (mass 2) / (distance) (squared)

gravitational force(N)

The gravitational force exerted on an object

weight (N) = mass (kg) X gravitational acceleration (m/s2)

Anything thats thrown or shot through the air

Acceleration toward the center of a curved or circular path

The net force exerted toward the center of a curved path

the product of its mass and velocity

momentum (kg m/s) = mass (kg) X velocity (m/s)

if a group of objects exerts forces only on each other, their total momentum doesnt change

states that if the net force acting on an object is zero, the object remains at rest, or if the object is moving, it continues moving in a straight line with constant speed.

states that the acceleration of an object is in the same direction as the net force on the object, and that the acceleration can be calculated from the following equation:

The gravitational force exerted on an object

Acceleration toward the center of a curved or circular path

The net force exerted toward the center of a curved path

describes action-reaction pairs this way: When one object exerts a force on a second object, the second one exerts a force on the first that is equal in strength and opposite in direction

the product of its mass and velocity.

if a group of objects exerts forces only on each other, their total momentum doesn’t change.