force, friction gravity and the laws of motion

• The weight of an object is equal to its mass times gravitational field strength.
• Newton's First Law states that if there are no forces acting on an object, it will continue moving at a constant velocity or remain stationary.
• For every action, there is an equal and opposite reaction.
• Gravity is the force that pulls objects towards one another due to their masses.
• The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
• The weight of an object is equal to its mass multiplied by the acceleration due to gravity.
• An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
• If an unbalanced force acts on an object, it will accelerate in the direction of the net force.
• Frictional forces act between two surfaces in contact and oppose relative movement between them.
• Frictional forces act between two surfaces in contact with each other and oppose relative movement between them.
• Acceleration is directly proportional to the magnitude of the net force acting on an object and inversely proportional to its mass.
• Static friction acts when one body is not moving against another, while kinetic friction acts when both bodies are moving relative to each other.
• Static friction acts when one body tries to move against another static body.
• Kinetic friction acts when one body moves over another kinetic body.
• Friction is the resistance between two surfaces when they move against each other.
• Inertia is the tendency of an object to resist changes in its state of rest or uniform motion.
• Acceleration is the rate of change of velocity with respect to time.
• Rolling friction occurs between wheels and the ground.
• Kinetic friction acts when two surfaces are sliding over each other.
• Static friction acts when two surfaces are not sliding over each other but have some tendency to slide.
• Static friction occurs when two surfaces are not sliding against each other but are held together by some form of attraction.
• Kinetic friction occurs when two surfaces are moving relative to each other.
• Frictional forces act between two surfaces in contact when they are moving relative to each other or if they have different shapes.
• Kinetic friction occurs when there is relative movement between two surfaces in contact.
• Static friction occurs when two surfaces are stationary relative to each other but can move past each other.
• Static friction occurs when there is no relative movement between two surfaces in contact.
• Static friction occurs when there is no relative movement between two objects that are touching each other.
• Rolling resistance is the frictional force opposing the rolling motion of an object over a surface.
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