2D Kinematics (Ch. 4)

Question 1

motion in the x-direction vs. motion in the y-direction

Answer 1

• motion in each direction is INDEPENDENT
• you need to determine which type of motion each direction has (constant velocity or constant acceleration)

Question 2

projectile motion

Answer 2

• a type of 2D motion where an object is in free fall in the vertical direction and moving with a constant velocity in the horizontal direction

Question 3

implicit information in projectile motion problems

Answer 3

• acceleration in the y-direction is always 9.8 m/s₂ downwards
  
  • therefore, it is a case of constant acceleration
• acceleration in the x-direction is always zero
  
  • therefore it is a case of constant velocity
• if at a zero-launch angle, there is no y-velocity, only x-velocity
• the y-velocity at the peak is zero
• there is velocity symmetry in the y-direction
• time symmetry in both

Question 4

which variable connects motion in the x and y directions?

Answer 4

• time