Force Concepts
What is the definition of force in physics?
What is a push or pull on an object?
Newton's First Law is also known as the law of ________.
What is inertia?
Newton's Second Law states that the acceleration of a system is directly proportional to the net external ________ acting on the system.
What is force?
Newton's Third Law states that for every action, there is an equal and opposite ________.
What is reaction?
The force that opposes the motion of two surfaces sliding past each other is called ________.
What is friction?
Forces are vectors because they have both ________ and ________.
What are magnitude and direction?
An object at rest will stay at rest unless acted upon by a ________.
What is a net external force?
The equation form of Newton's Second Law is ________.
What is F=ma?
When you push on a wall, the wall pushes back with ________ force.
What is equal?
The force that acts perpendicular to the surface of an object in contact with another surface is called the ________ force.
What is normal?
The unit of force in the International System of Units (SI) is the ________.
What is the newton (N)?
Inertia is related to an object’s ________.
What is mass?
The net external force on an object is the vector sum of all ________ acting on the object.
What are forces?
Newton's Third Law applies to forces between ________ objects.
What are two?
The pulling force transmitted along a rope, string, or cable is called ________.
What is tension?
An object is in equilibrium if the net external force acting on it is ________.
What is zero?
If no net external force acts on an object, its velocity is ________.
What is constant?
If a constant, nonzero force is applied to an object, the object will have a constant ________.
What is acceleration?
The forces described by Newton's Third Law are always equal in ________ and opposite in ________.
What are magnitude, direction?
The force exerted by a compressed or stretched spring upon any object that is attached to it is called ________ force.
What is spring?
The graphical representation of all external forces acting on a body is called a ________.
What is a free-body diagram?
Newton's First Law applies to objects in an ________ frame of reference.
What is inertial?
When considering Newton's Second Law, internal forces within a system ________ (do/do not) affect the acceleration of the system.
What is do not?
A rocket's thrust is an example of Newton's Third Law, where the action is the expulsion of gas and the reaction is the ________ of the rocket.
What is movement?
The gravitational force acting on an object is also known as its ________.
What is weight?