What is Newton's first law?
Why do objects slow down?
What do force, external force, and net force mean?
What does mass mean?
What do solved questions involving Newton's first law look like?
Example 1: space probe drift
b. The space probe would speed up.
c. The space probe would slow down and eventually stop.
d. The space probe would immediately stop.
Example 2: elevator lift
b. is equal to .
c. is smaller than .
d. could be larger or smaller than depending on the mass of the elevator.
Example 3: space probe path
b. Path b
c. Path c
d. Path d