dynamics

• scalars only have magnitude - speed, mass, time, distance, energy
• vectors have magnitude and direction- velocity, displacement, acceleration, force
• acceleration is the change in velocity per second to measure - initial speed( length of card/time to cut lg1) and final speed ( length of card/time to cut lg2)
• newtons law 1 states that an object must remain at rest or travel at a contstant speed unless acted on my an unbalanced force
• newtons law 2 states F=Ma
• newtons law 3 states that every action force has an equal and opposite reaction force W=mg
• energy cant be created or destroyed only change form Ew=Ep=Ek
• a projectile is an object with vertical and horizontal motion
• instantaneous speed is the speed of an object at a particular instant in time. to measure - length of card - time to cut light gate