Student Beginning of the semester End of the semester 1 The concept of acceleration is the amount of how fast an object is moving by time. An unbalanced force can change the direction or magnitude of velocity. We know that acceleration is related to change in velocity and so there is a net force acting on an object in an accelerated motion. 2 Displacement is the area travelled by an object with respect to a starting point and the distance is [has] the whole area travelled from the starting point to the final point. The work done by a force is related to the displacement. Displacement is a vector that shows the position of an object with respect to its initial position. 3 A projectile motion is a uniform motion since the initial velocity is the same as final velocity and velocity is zero in the middle and the parabola is uniform. The acceleration is also uniform and is −9.81. Dynamic equilibrium is the same concept as uniform motion in which velocity is constant and acceleration is zero. 4 Velocity is a vector quantity, meaning magnitude and direction which is the distance an object has travelled relative to its starting point at two specific points in time. In a dynamic equilibrium, velocity is constant which means that change in object’s position over a given amount of time is constant. 5 Acceleration means speed is increasing and deceleration means speed is decreasing and accelerated motion means uniform increase in speed and has a direction since it is a vector. An object accelerates when its velocity changes. Newton’s second law shows that when an unbalanced force acts upon on an object the velocity changes and object accelerates. 6 Acceleration is the slope of velocity and velocity has a slope when object moves uniformly and this means that acceleration is constant and slope of acceleration is zero. A positive slope of velocity means that acceleration is positive and doesn’t mean that direction of motion is positive Acceleration and velocity have the same sign when an object is speeding up. An object speeds up when I drop it and so acceleration must be negative since velocity is downward. When it comes to Newton’s second law, net force is downward and has the same direction as acceleration. 7 Acceleration is most closely related to position versus time, just has a magnitude since it is a vector. Acceleration is a vector quantity meaning it has direction and magnitude. Acceleration is the rate of change of an object’s velocity in relation to the time. Newton’s second law states that an object’s acceleration is dependent on two variables, the net force acting on it, and the object’s mass. 8 Acceleration is the curve of velocity time graph. In a velocity time graph the line would curve representing that the object is speeding up. In a uniform motion velocity time graph is a straight line. An example of acceleration would be a car speeding up from rest after the traffic light turns green. In this example acceleration is positive. Acceleration can also be negative which shows that the object is slowing down. Newton’s second law of motion states that when a net force acts on an object, it will change the object’s velocity and cause an object to accelerate. The shape of the velocity time graph reveals useful information about the acceleration. A horizontal line shows that acceleration is zero. A positive slope shows a positive acceleration and a negative slope shows a negative acceleration.