topic 2 - motion + forces

• newtons second law states that the rate of change of momentum of an object is directly proportional to the net force applied to the object and occurs in the direction of the net force.
• newton's first law states that if there are no resultant forces acting on an object, it will continue to move at constant velocity or remain stationary.
• the force on an object is the product of its mass and acceleration
• newton's third law states that when two objects interact with one another they exert equal but opposite forces upon each other.
• the equation for newton's second law is F=ma
• force = mass x acceleration
• momentum = mass x velocity
• the acceleration due to gravity (g) is approximately 9.81 m/s^2
• a free body diagram shows all external forces acting on an object as vectors.
• average speed = total distance / time taken
• a vector quantity has both magnitude and direction
• scalar quantities have only magnitude