Forces

• Magnetic force is the force exerted by magnets or magnetic fields on other magnets, magnetic materials, or moving charges.
• For every action, there is an equal and opposite reaction.
• Contact forces are caused by direct physical contact between two surfaces.
• 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.
• Forces can be classified as contact forces (forces between objects) or field forces (forces acting at a distance).
• 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.
• A force is any push or pull that changes the motion, shape or position of an object.
• The second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
• The first law of motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will stay in motion with the same velocity, unless acted upon by an external force.
• The magnitude of the resultant force depends on the masses of the objects involved and their relative speeds.
• Friction is a type of contact force that opposes motion between two objects in contact.
• The magnitude of frictional force depends on the nature of the surface and the speed at which they move relative to one another.
• Newton's third law states that if two objects interact with one another, they do so equally and simultaneously.
• When forces act at different angles to each other, the resultant force can be found using vector addition.
• Friction is a type of contact force that opposes motion between two surfaces in contact.
• Gravity is a fundamental force of nature that causes all matter to attract one another with varying strengths depending on their masses.
• Static friction occurs when two stationary objects try to slide over each other.
• Inertia is the tendency of an object at rest to remain at rest and an object in motion to continue moving at constant velocity unless acted upon by a resultant force.
• Gravity is a universal force of attraction between all matter in the universe.
• Field forces act over a distance without touching another object, including gravitational attraction, electrostatic repulsion/attraction, magnetic attraction/repulsion, and nuclear forces.
• Friction is a resistive force which opposes relative movement between two bodies in contact.
• Newton's third law of motion states that when two objects interact, they exert equal and opposite forces on each other.
• Gravity is a non-contact force that pulls all objects towards the center of Earth.
• Newton's third law of motion states that when one body exerts a force on another body, the other body simultaneously exerts a force equal in size but opposite in direction on the first body.
• Contact forces are forces exerted when two surfaces touch each other, such as friction, tension, normal reaction, air resistance, and pressure.
• Newton's first law of motion states that if there is no resultant force acting on an object then it will remain stationary or continue moving at constant velocity.
• When a resultant force does act on an object, Newton’s second law describes how this results in a change in the object’s velocity.
• If an object is initially stationary, it will remain so until acted upon by an external force.
• If an object has a non-zero velocity, then a resultant force must act on it.
• Contact forces are forces that act between objects that touch each other, such as friction, tension, air resistance, normal reaction, and weight.
• Tension is a pulling force exerted by a stretched string or cable.
• Field forces are forces that act over a distance without touching another object, such as gravitational attraction and electrostatic repulsion/attraction.
• Air resistance is a type of non-contact force that acts against moving objects due to air molecules colliding with them.
• Newton's third law states that if one body A exerts a force on another body B, then there is an equal and opposite force from B back onto A.
• Spring Force is a pushing/pulling force exerted by a spring when it is compressed or extended.
• Gravity is a universal force that attracts all matter towards each other.
• Forces can be classified into three types based on their origin: internal forces (within an object), external forces (acting from outside the object), and resultant forces (the sum of all other forces).
• Forces acting perpendicularly to each other add up like vectors.
• Weight is the gravitational force exerted on an object by Earth's gravity.
• Forces are vectors, meaning they have both magnitude (size) and direction.