I am stuck on these two questions. thanks in advanced!
1. Which of the following is an inertial frame of reference?
a) a child on a moving swing observes the child next to them moving in sync
b) a child on a moving swing observes a ball that they throw to their parents standing on the ground
c) a child observes the motion of the planets in the night sky over many nights
d) a child observes the motion of the sun across the sky during the day
2. In a pulley problem involving an inclined plane:
a) the gravity need to be resolved into components
b) the tension need to be resolved into components
c) the friction need to be resolved into components
d) the direction convention is the same for both blocks