1. In which situation does the motion of an animal show that net force is acting on that animal?
A) An eagle remains flying at a constant velocity
B) A running tiger increases its speed from 4 m/s to 6 m/s
C) A sparrow remains stationary perched on a power line.
D) At 0 s, a snake slithers forward with a velocity of 2 m/s. 5 s later the snake's velocity is still 2 m/s

2. Which of the following is an example of a net force?
A) A 10 kg box of books has inertia
B) A car travels at a constant velocity of 10 m/s.
C) Friction pushes against an object, slowing it down.
D) A car in motion will tend to stay in motion, while a car at rest will tend to stay at rest.