![]() Comment: We assume the object is falling downward. Newton’s Second Law of Motion CHECK YOUR ANSWER At one instant an object in free fall has a speed of 40 m/s. Its speed one second later is (answers have been rounded) A. Newton’s Second Law of Motion CHECK YOUR NEIGHBOR At one instant an object in free fall has a speed of 40 m/s. This means the object’s velocity changes by 9.8m/s each second it falls. An object in free fall accelerates toward Earth (or down) at 9.8m/s2. Newton’s Second Law of Motion free fall - When the only force acting on a falling object is gravity (negligible air resistance / drag). The mass of the cart doubled when the force doubled. If the acceleration remains the same, what is a reasonable explanation? A. Newton’s Second Law of Motion CHECK YOUR ANSWER Push a cart along a track so twice as much net force acts upon it. The cart experiences a force that it didn’t before.Newton’s Second Law of Motion CHECK YOUR NEIGHBOR Push a cart along a track so twice as much net force acts upon it. If the force remains the same while the mass of the cart decreases to half, the acceleration of the cart A. Newton’s Second Law of Motion CHECK YOUR ANSWER Consider a cart pushed along a track with a certain force. Newton’s Second Law of Motion CHECK YOUR NEIGHBOR Consider a cart pushed along a track with a certain force. Newton’s Second Law of Motion _net force, _mass _acceleration _ net force, _mass _ acceleration small large small large small large Newton’s Second Law of Motion The acceleration produced by a net force on an object is directly proportional to the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object. Newton’s First Law of Motion CHECK YOUR ANSWER If you swing a stone overhead in a horizontal circle and the string breaks, the tendency of the stone is to follow a A. Newton’s First Law of Motion CHECK YOUR NEIGHBOR If you swing a stone overhead in a horizontal circle and the string breaks, the tendency of the stone is to follow a A. gravity pulls harder on the can than on the paper. Newton’s First Law of Motion CHECK YOUR ANSWER A sheet of paper can be quickly withdrawn from under a soft-drink can without the can toppling, because A. ![]() ![]() ![]() Newton’s First Law of Motion CHECK YOUR NEIGHBOR A sheet of paper can be quickly withdrawn from under a soft-drink can without the can toppling, because A. Newton’s First Law of Motion Also called the law of inertia States: Every object continues in a state of rest or constant speed in a straight line unless acted on by a nonzero net force. The forces acting on the object are not balanced so its motion changes in the direction of the net force Unbalance Forces – All the forces acting on the object are not balanced so the net force on the object is not zero. Sum of all forces acting on an object Balance Forces – All the forces acting on the object are balanced so the net force on the object = zero.Net Force The forces acting on the object are balanced so it continues with constant motion due to inertia E N D - Presentation Transcriptįorce, Mass, and Acceleration Foundations of Physics ![]()
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