Science Ch. 2 Lessons 3-4

When you push against an object is called the *blank*

Action force

When an object applies a force on another object, the second object applies a force of the same strength on the first object, but the force is in the opposite *blank*

Direction

True or False, Unbalanced forces DO NOT change the velocity of an object?

False

The forces two objects apply to each other.

Force pairs

What causes an object's velocity do to make an object want move along a straight path?

Inertia

What is Velocity?

A speed in a certain direction.

An object that is moving in a circle accelerates in the direction of the *blank*

Centripetal force

The force that acts perpendicular to the direction of motion toward the center of the curve, in circular motion.

Centripetal force

Any motion in which an object is moving along a curved path.

Circular motion

The total momentum of a group of objects stays the same unless outside forces act on the objects.

Law of conservation of momentum

A measure of how hard it is to stop a moving object.

Momentum

The acceleration of an object is equal to the net force acting on an object divided by the object's mass.

Newton's Second law of motion

When one object exerts a force on a second, the second object exerts s force in the opposite direction on the first object.

Newton's third law of motion

For every action force, there is a *blank* force that is equal in strength but opposite in direction.

Reaction

Force applied by the object is called *blank*

Reaction force

If the direction of the net force on an object is opposite to the direction the object moves, the object *blank*

Slows down

If the net force acting on a moving object is in the direction that object is moving, the object will, *blank*

Speed up

What happens when unbalanced act on an object at rest?

The object begins moving in the direction of the net force.

True or False, Only unbalanced forces change a object's velocity.

True

True or false newtons second law of motion describes the relationship between an object's change in velocity overtime, or acceleration, and unbalanced forces acting on the object.?

True

And objects momentum is in the same direction as it's *blank*

Velocity

What are two ways to velocity can change?

Velocity can change because of changing direction and because of unbalanced forces.