forces

• • Drag forces are resistive forces encountered by objects moving through the air or water, opposing their motion.
• Friction forces resist the motion between two surfaces. Friction is a contact force.
• Outcomes when forces acting on an object are unbalanced


  1. Acceleration

  2. Change in Motion

  3. Deformation or Rotation
• Acceleration


  The object will accelerate in the direction of the net force. The acceleration is directly proportional to the magnitude of the net force and inversely proportional to the mass of the object.
• Change in Motion

  If the object is already in motion, unbalanced forces can cause a change in its velocity, either speeding it up, slowing it down, or altering its direction, depending on the direction and magnitude of the net force.
• Deformation or Rotation


  In some cases, particularly with rigid or deformable objects, unbalanced forces can cause deformation or rotation rather than linear motion. This occurs when the net force causes a torque or twisting effect on the object.
• As you move further from a mass within a force field, like a gravitational field, the gravitational force weakens. This means that the force diminishes as the distance increases, following a proportional decrease inversely proportional to the square of the distance from the centre of mass.
• Forces push or pull effect on an object. There are two kinds of forces: contact forces, for example friction and air resistance, and non-contact forces, for example gravity and magnetism.
• Mass is the measure of the amount of matter in an object. Its SI unit is the kilogram (kg).
• Weight is the force exerted on an object due to gravity. Its SI unit is the newton (N).
• Deform

  • Squishing a stress ball in your hand deforms its shape temporarily; to change the shape or size of an object by applying force
• Compress

  • Squeezing a sponge compresses it, reducing its size
• Stretch

  • Pulling on a rubber band stretches it, increasing its length
• Extension

  • When you stretch a spring, it undergoes extension, getting longer
• Reaction force

  The force exerted by a surface on an object in response to the force exerted by the object on the surface; so, if you push against a wall, the wall pushes back on you with the same force
• Reaction force

  • When you stand on the ground, the ground exerts a reaction force upwards to support your weight
• Tension

  The pulling force exerted by a stretched object, such as a rope or a cable
• Tension

  • When you pull both ends of a rubber band, you apply tension to it, causing it to stretch
• Elastic limit

  • If you stretch a rubber band gently, it returns to its original shape, but if you stretch it too far beyond its elastic limit, it won't return to its original shape, showing permanent deformation
• What is Hooke's Law?


  Hooke's Law says that the force needed to stretch or compress a material is directly proportional to how far you stretch or compress it, as long as the material stays within it's elastic limit