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Chapter 7 Impulse and Momentum. Chapter 7 Impulse and Momentum. Concepts learned so far: Impulse Momentum Impulse-Momentum theorem Conservation of momentum. Collisions in Two Dimensions. Collisions in Two Dimensions. Collisions in Two Dimensions.

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chapter 7 impulse and momentum2
Chapter 7Impulse and Momentum
  • Concepts learned so far:
  • Impulse
  • Momentum
  • Impulse-Momentum theorem
  • Conservation of momentum
collisions in two dimensions5
Collisions in Two Dimensions
  • Apply conservation of momentum in the X direction.
collisions in two dimensions6
Collisions in Two Dimensions
  • Apply conservation of momentum in the X direction.
  • Apply the conservation of momentum in the Y direction.
collisions in two dimensions7
Collisions in Two Dimensions
  • Apply conservation of momentum in the X direction.
  • Apply the conservation of momentum in the Y direction.
  • If the collision is elastic, apply the conservation of energy.
problem 35
Problem 35

A 50.0-kg skater is traveling due east at a speed of 3.00 m/s. A 70.0-kg skater is moving due south at a speed of 7.00 m/s. They collide and hold on to each other after the collision, managing to move off at an angle θ south of east, with a speed of vf. Find (a) the angle θ and (b) the speed vf, assuming that friction can be ignored.

7 5 center of mass
7.5 Center of Mass

The concept center of mass (abbreviated as “cm”) is very useful in dealing with larger objects.

For example, in dealing with Earth, we placed the mass of Earth at the cm of the Earth.

Earth

definition of cm
Definition of CM

The center of mass is a point that represents the average location for the total mass of a system.

center of mass
Center of Mass

Where is the cm of the following two 5-kg masses?

center of mass12
Center of Mass

Where is the cm of the following two 5-kg masses?

Answer: In the middle.

center of mass13
Center of Mass

Where is the cm of the following two, 5-kg & 12-kg masses?

center of mass14
Center of Mass

Where is the cm of the following two, 5-kg & 12-kg masses?

Answer: The center of mass “cm” of the two masses is located on a line between them and lies closer to the more massive 12-kg mass.