Unformatted text preview: the product of mass and velocity, and is a vector quantity. momentum = mass x velocity p = mv
· SI unit for momentum is kg×m/s or Ns.
· To change the linear momentum of an object, a net unbalanced force is required. Force produces linear motion Examples: 1. Which has a greater momentum: the boulder or the runner? Why? 2. Calculate the momentum of a baseball that has a mass of 0.20 kg and is moving at a velocity of 30 m/s. m = v = p =
3. A truck with a momentum of 85000 kgm/s is moving with a velocity of 50 m/s. Determine its mass. m = v = p = 10 Physical Science 1 Chapter 3 ANGULAR MOMENTUM
· Objects that move around an axis of rotation possess angular momentum.
· A planet orbiting the sun (axis of rotation) possesses angular momentum.
· Angular momentum is the product of mass, velocity and distance from axis or rotation. Angular momentum = mass x velocity x distance from axis of rotation L = m v r
· To change the angular momentum of an object, a net unbalanced torque is required.
· The opposite forces applied to the steering wheel produce a net torque which rotates the wheel. Therefore, Torque produces rotational motion
· Torque is the product of force and lever arm. Torque = force x lever arm τ = F x r
· The same force applied through a longer lever arm produces a larger torque. 11 Physical Science 1 Chapter 3 CONSERVATION OF MOMENTUM
· The total momentum of a system remains unchanged before and after an event.
· A system is a collection of ob...
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