Question

b. cross out the incorrect word in each sentence below and write the correct word above it to make the statement true. 1. gravity keeps an object moving in a straight line at a constant speed. 2. the path of a baseball is unaffected by the laws of motion. 3. the more mass an object has, the less inertia it has.

Explanation:

For sentence 1: According to Newton's first law, inertia (not gravity) is what keeps an object in uniform motion (straight line, constant speed) in the absence of net force. So cross out "Gravity" and write "Inertia" above.
For sentence 2: The path of a baseball (a projectile) is governed by the laws of motion (especially Newton's laws and projectile motion principles). So cross out "unaffected" and write "affected" above.
For sentence 3: Inertia is directly proportional to mass—more mass means more inertia. So cross out "less" and write "more" above.

Answer:

1. Cross out "Gravity", write "Inertia" above.
2. Cross out "unaffected", write "affected" above.
3. Cross out "less", write "more" above.