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Physics Ch. 4

QuestionAnswer
Define force. The cause of an acceleration, or the change in an object's velocity.
Force can cause objects to do what? Start moving, stop moving, or change direction.
What is the unit of force? Newton.
Who is the newton named after? Sir Isaac Newton.
1 Newton= ? (1kg)(1m/s^2)
What are the two ways force can occur? 1.) Contact. 2.) Field.
Define contact force. Force that arises from the physical contact of two objects. Ex- Catching a football.
Define field force. Force that can exist between objects, even in the absence of physical contact between the objects. Ex- Force of gravity.
Define force diagrams. A diagram of the objects involved in a situation and the forces exerted on the object.
Is force a scalar or vector quantity? Vector.
Define net external force. The total force resulting from a combination of external forces on an objects. A.K.A. resultant force.
When on a flat surface, Fnorm is equivalent to what? Fgravity.
Define Newton's First Law. An object at rest remains at rest, and an object in motion continues in motion with constant velocity unless the object experiences a net external force.
Define inertia. The tendency of an object to maintain its state of motion.
Which has more inertia: a toy car or a real car? A real car.
______ is measurement of inertia. Mass.
Define equillibrium. The state in which there is no change in a body's motion.
Define Newton's Second Law. The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the object's mass.
Define Newton's Third Law. For every action, there is an equal and opposite reaction.
Define weight. The magnitude of the force of gravity acting on an object.
Define normal force. A force exerted by one object on another in a direction perpendicular to the surface of contact.
Define static friction. The resistive force that opposes the relative motion of two contacting surfaces that are at rest with respect to one another. (Fs)
Define kinetic friction. The resistive force that opposes the relative motion of two contacting surfaces that are moving past one another. (Fk)
Define coefficient of friction. The ratio of the force of friction to the normal force acting between two objects.
Which is more: static friction or kinetic friction. Why? Static friction because Law of Inertia states it takes more force to put an object into motion than to keep it in motion.
Created by: OliviaRoark
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