# Resistance of an object to a change in its motion inertia.

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resistance of an object to a change in its motion inertia

forces on an object that combine to give a zero net force and do not change the motion of the object balanced force

the rate of change in position at a given point in time instantaneous speed

If two balls collide and stick, it is an… Inelastic collision

the total distance an object travels divided by the total time of travel average speed

states that the acceleration of an object is in the same direction as the net force on the object, and that the acceleration equals the net force divided by the mass Newton's second law of motion

If two balls collide and bounce, it is an… elastic collision

force that opposes the motion between two touching surfaces friction

frictional force that prevents two surfaces from sliding past each other static friction

frictional force that opposes the motion of two surfaces sliding past each other sliding friction

Who categorized motion as either natural or violent motion? Aristotle

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

gravitational force exerted on an object weight

acceleration of an object toward the center of a curved path or circular path centripetal acceleration

states that when one object exerts a force on a second object, the second object exerts a force on the first object that is equal in strength and in the opposite direction Newton’s Third Law

property of a moving object that equals its mass times its velocity momentum

a push or pull first exerting force on a second What is a force?

The overall force of an object after all of the forces are added together. Net force

Equal forces acting on one object in an opposite directions. Balanced forces

When you add equal forces exerted in opposite directions, the net force is _____. zero

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

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? F=ma The net force of an object is equal to the product (addition) of its acceleration and mass.

P stands for momentum

p= p=mv

Change in p= Change in p = F*t

F= F=ma

p initial = p final

How does an increase of force affect acceleration? An increase of force causes an increase in acceleration.

What two factors does friction depend on? 1. The types of surfaces involved 2. How hard the surfaces push together

The force that pulls objects towards earth? Gravity

What is acceleration due to the force of gravity? 9.8 m/s squared

An object that is thrown and falls freely is called… A Projectile

The greater surface area of an object, the greater the ________ through the air. Air resistance

What is weight? The force of gravity on an object at the surface of a planet.

The greatest velocity a falling object reaches is the … terminal velocity

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 ________. Newtons or pounds

Mass is measured in Kilograms, not pounds

The gravitational force of attraction varies with what two factors? Mass + Distance

What is the unit of measure for momentum? kg x m/s

What is the equation you use to determine momentum? mass x velocity

What of the law of conversation of momentum state? The total momentum of the objects that interact does not change.

If two clay balls collide, how can you find their new momentum? Combine both of their old momentums together

change in velocity over time Acceleration

Total distance an object travels divided by the total time it takes to travel that distance. Average Speed

A force is exerted on a box and an equal and opposite force is exerted by the box. What law explains this? Newton's third law of motion

What unit is force measured in? Newtons

____________ describes how velocity changes with time. acceleration

When an object is at rest, what is its speed? 0 m/s

increasing speed, decreasing speed, changing direction examples of acceleration

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