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.