Forces

• Tension forces result from the stretching of elastic materials.
• Contact forces are caused by direct physical contact between objects.
• Forces can be classified as contact forces (pushing/pulling) or non-contact forces (gravity).
• Friction converts mechanical work into thermal energy, which is dissipated as heat.
• The magnitude of friction depends on the nature of the surfaces in contact and the forces pressing them together.
• A force is any push or pull that changes the motion, shape or size of an object.
• Magnetic force is the force exerted by magnets or magnetic fields on other magnets, magnetic materials, or moving charges.
• The three laws of motion describe how forces affect the motion of objects.
• A spring is an example of an object that experiences tension when stretched or compressed.
• The force required to stretch a spring depends on its length, with longer springs requiring more force than shorter ones.
• When a spring is pulled by a force, it will continue to move until the applied force equals the restoring force (the force needed to return the spring to its original shape).
• Friction is a type of contact force that opposes motion or tends to slow down moving objects.
• Friction is a force that opposes motion, causing an object to slow down when moving across a surface.
• The frictional force depends on the nature of the surfaces involved and the amount of pressure applied.
• Air resistance acts against any moving object due to air molecules colliding with it.
• Spring force is the elastic restoring force experienced when stretching or compressing a spring.
• If the net force acting on an object is not zero, its acceleration is directly proportional to the net force and inversely proportional to its mass.
• Air resistance is the drag force acting against an object due to its interaction with air molecules.
• Acceleration = Net Force / Mass
• Newton's first law states that if there are no resultant forces acting on an object, it will remain at rest or continue moving with constant velocity.
• Forces can be represented as vectors using arrows, where the length represents the magnitude and the arrowhead indicates the direction.
• A vector quantity has both magnitude and direction, while a scalar quantity only has magnitude.
• Newton's First Law states that an object at rest stays at rest unless acted upon by an external force, while an object in motion continues in motion with constant speed and direction unless acted upon by an external force.
• Newton's second law states that if the net force acting on an object is not zero, its acceleration is directly proportional to the net force and inversely proportional to its mass.