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Net Force Particle Model. Newton’s Law Problems- unbalanced forces. Key Ideas . The amount by which the forces acting on an object are unbalanced is called the net force. When forces acting on an object are unbalanced, the object will accelerate.

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net force particle model

Net Force Particle Model

Newton’s Law Problems- unbalanced forces

key ideas
Key Ideas
  • The amount by which the forces acting on an object are unbalanced is called the net force.
  • When forces acting on an object are unbalanced, the object will accelerate.
        • Acceleration is a change in velocity, and velocity includes both magnitude (speed) and direction, so a net force will change the speed and/or the direction of an object’s motion.
        • Forces may be balanced in one direction and unbalanced in the other.
newton s 2 nd law
Newton’s 2nd Law
  • The net force on an object divided by its mass equals its acceleration
        • (Fnet) / m = a
        • Fnet = ma
  • Use Newton’s 2nd Law to qualitatively describe the relationship between: mass and acceleration, force and acceleration and mass and force.
        • If you double the mass, the acceleration will change by a factor of ….?
  • Use Newton’s 2nd Law to solve quantitative problems involving F, m and a.
        • Use a force diagram to find the net (unbalanced) amount of force.
        • List force and motion variables – knowns and unknowns. (next slide)
newton s 2 nd law1
Newton’s 2nd Law
  • List force and motion variables – knowns and unknowns.
        • Force Equation: Fnet = maForce Variables: acceleration, mass, net force
        • Motion Equations (Kinematic Eqns):Motion Variables: acceleration, initial velocity, final velocity, ∆t, ∆x (displacement)
  • Common variable: acceleration
  • Use what you know to solve for acceleration, then use it to solve for unknowns.
sample problems
Sample Problems
  • Draw a force diagram for a 900-kg car that exerts 5000-N of traction force on a level road while being opposed by 1000-N of friction and drag forces combined.
  • Write the net force equation for the car.
  • Calculate the acceleration of the car.
  • Draw a force diagram for a block sliding to a stop.
  • Label the magnitude of the forces for a 5-kg block that is initially traveling at 30 m/s and slows to a stop in 5 sec.