NLN PAX Science: Physics

aim of physics correct answers to understand the physical laws and principles that influence every aspect of daily life displacement of an object correct answers the distance that an object is from some starting point, and is measured in units of length How does displacement change when an object is in motion? correct answers it is constantly changing How is motion described? correct answers by displacement, velocity (speed) and acceleration speed correct answers distance traveled by an object per unit of time speed = (distance traveled/time) velocity correct answers speed in a given direction What two things does velocity tell us about a moving object? correct answers its speed and direction acceleration correct answers the rate of change in velocity; can be any change in velocity, either positive or negative. deceleration correct answers negative acceleration or a decrease in velocity and can change in direction How is acceleration calculated? correct answers (final velocity-original velocity)/time Why can velocity and acceleration be described using vectors? correct answers because they have both magnitude and direction What quality do all moving objects have? correct answers momentum; an object traveling at a specific velocity has momentum calculate momentum correct answers Momentum = mass x velocity conservation of momentum correct answers the total movement of an isolated system is always constant, ie during a collision, the momentum of each body changes but the total momentum is conserved. One object may lose momentum, but this momentum is gained by other object