PHYSICS 201 WEEK 1 NOTES 1D Motion Scalars & Vectors • Scalars: Quantities that have a magnitude ➢ time, temperature, mass, speed • Vectors: Quantities that have both a magnitude and a direction ➢ Force, velocity, acceleration, torque Distance & Displacements (m) • Distance (scalar): how much ground an object has covered • Displacement (vector): how far out of place an object it is ➢ ∆X=X-X f i ➢ Can be negative Velocity (m/s) • Speed (scalar): how fast an object is moving ➢ Never negative ➢ Avg. Speed = Distance Traveled/ Time of Travel • Velocity (vector): rate at which an object is displaced ➢ Avg. Velocity = Displacement/ Time ➢ Negative Velocity is usually left or down 2 Acceleration (m/s ) • Acceleration (vector): rate at which the velocity is changed ➢ Avg. Acceleration = ∆Velocity/ Time • Acceleration Vectors depend on two things 1. Is object speeding up or slowing down 2. Is object moving in the + or – direction ➢ If an object is slowing down, then the vector is in the opposite direction of its motion ➢ If an object is speeding up, then the vector is in the same direction of its motion ➢ + and – are directional adjectives meaning up and down respectively and left and