Linear Kinematics & Kinetics

Kinematic tools

Asking: 1. Is it moving? 2. Is it getting faster or slower?

• Position: tells us where something is in space, RELATIVE to some other thing

• Displacement: how far something has moved relative to its initial position

• Velocity: displacement over time (m/s)

• Acceleration: change in velocity (m/s²)

Kinetics

Asking: Why is it moving? Why is it getting faster or slower?

• ∑F =ma

• a = ∑F/m

Examples:

• Standing

  • ∑F=ma

  • we a mass, but no acceleration so ∑F=O

• Rising

  • ∑F=ma

  • a = v_f- v_i /time

    • (0.5 m/s - 0 m/s)/1sec = +0.5 m/s²

  • ∑F=m(0.5m/s²)