AC HPAT Physics Exam Questions Complete Solutions

AC HPAT Physics Exam Questions Complete Solutions DIstance - ANSWER- · Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion. Displacement - ANSWER- · Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position. Position - ANSWER- · Position is a place where someone or something is located or has been put. In physics, position is usually a number on an axis. ... Position is a vector, because direction matters. But distance is a scalar. Distance is how far you've traveled. Speed - ANSWER- · Speed is the distance traveled per unit of time. It is how fast an object is moving. Speed is the scalar quantity that is the magnitude of the velocity vector. It doesn't have a direction. Acceleration - ANSWER- · Acceleration is the rate of change of velocity with time. Instantenous velocity - ANSWER- · Instantaneous velocity is the velocity of an object in motion at a specific point in time. This is determined similarly to average velocity, but we narrow the period of time so that it approaches zero. If an object has a standard velocity over a period of time, its average and instantaneous velocities may be the same. A force - ANSWER- a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull Net force - ANSWER- · Net force is the vector sum of forces acting on a particle or body. The net force is a single force that replaces the effect of the original forces on the particle's motion. It gives the particle the same acceleration as all those actual forces together as described by the Newton's second law of motion. Uniform vs. non-uniform motion - ANSWER- · Difference between uniform and nonuniform motion with examples. In Uniform motion, movement of a body is along the straight line with constant speed. In non uniform motion, movement of a body is along the straight line with variable speed. In uniform motion, body covers equal distance in equal interval of time What is the difference between constant, instantaneous, and average speed? - ANSWER- · constant speed is where the speed is the same throughout and instantaneous speed is speed given at any moment and average speed is a total distance traveled divided by the amount of time it took to travel it. Newtons Laws - ANSWER- Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The third law states that for every action (force) in nature there is an equal and opposite reaction.