Part 2 - Determine if the following statements are true or false. 7. Inertia is the tendency of an object to resist motion.
8. Newton’s first law of motion is also called the law of acceleration.
9. If an object is at rest, inertia will keep it at rest.
10. The speed of an object changes only when it is acted on by an unbalanced force.
11. When you are moving at a high rate of speed, having a larger mass makes is harder to
stop.
12. Newton’s first law of motion applies only to objects that are already moving.
Gravity is a .
O velocity
O speed
O force
O weight
An object is accelerated when it is acted on by .
O an unbalanced force
O a balanced force
O velocity
O inertia
In which situation are the forces operating on an object unbalanced?
O A stack of books rests on a table.
O A car has a constant motion of 60 miles per hour.
O Two sides of a balance both support 20 kg.
O A baseball falls at a faster and faster speed.

Our planet has experienced five major extinctions in the four billion year history of life. the first, 450 million years ago, occurred shortly after the evolution of the first land-based plants and 100 million years after the cambrian explosion. the second extinction occurred 350 million years ago, causing the formation of coal forests. next earth experienced two mass extinctions during the triassic period, between 250 and 200 million years ago. the fifth mass extinction occurred 65 million years ago, ending the reptilian dominance of the earth. according to richard leakey, the sixth mass extinction is happening right now. leakey suggests that we, the human race, are the cause. each year, at our hand, approximately 50,000 species vanish from earth. he believes that man is destroying earth at a rate comparable with the impact of a giant asteroid. leakey's statistics indicate that 50% of earth's species will become extinct within the next 100 years assuming leakey's hypothesis of a sixth mass extinction to be true, how will we expect the model to change? a) a sharp spike in the graph approximately 100 million years from now b) a dip in the graph, followed by a sharp spike about 100 million years from now c) a sharp spike in the graph immediately following the "0" location of the x axis d) a plateau following the "0" mark on the x axis, followed by a gradual rise to a new peak