Bellringer Thursday, March 1, 2018:

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Presentation transcript:

Bellringer Thursday, March 1, 2018: Describe how each egg spins. Why do they spin differently? Hard boiled egg Raw egg

Momentum: A property of how much force is required to change the object’s motion The object’s mass times its velocity SI UNIT for momentum = (Kgx m)/s p = m×v p = momentum (kgxm)/s) m = mass (kg) v = velocity (m/s) If an object has no velocity, it has no momentum.

Momentum Example: What is the momentum of a car with a mass of 1500 kg traveling at a velocity of 28 m sec? p=1500 kg p= m x v p=1500 kg x 28 m p= 36,400 kg x m V= 28 m sec sec sec

Write text only m1v1 = m2v2 Law of Conservation of Momentum Momentum may be transferred to another object The total momentum before a collision is equal to the total momentum after the collision m1v1 = m2v2 Write text only

Types of Collisions Elastic collisions the total kinetic energy (motion) before the collision is equal to the total kinetic energy (motion) after the collision. Usually the objects bounce off of each other.

Inelastic collisions the total kinetic energy before the collision is NOT equal to the total kinetic energy after the collision. Usually the objects stick together

The Truck and The Ball A pickup truck is moving with a constant speed. In the course of its motion, a ball is projected straight upwards by a launcher located in the bed of the truck. Assume the ball does not encounter a significant amount of air resistance. What will be the path of the ball and where will it be located with respect to the pickup truck?

Many would insist that there is a horizontal force acting upon the ball since it has a horizontal motion. Yet this is simply not the case. The horizontal motion of the ball is the result of its own inertia. When projected from the truck, the ball already possessed a horizontal motion, and thus will maintain this state of horizontal motion unless acted upon by a horizontal force. An object in motion will continue in motion with the same speed and in the same direction ... (Newton's first law).

Newton's Law Review physclips newton's laws http://www.phys.unsw.edu.au/einsteinlight/