Question

answer the following. 7. if two different net forces are applied to the same object at different times, which one will cause the object to accelerate at a greater rate - the larger or smaller net force? 8. what are the two types of motion an object can experience when acted upon by balanced forces? 9. what is the equation for newtons second law? 10. define newtons third law in your own words, and give an example. 11. explain the action - reaction pair involved when a person walks down a sidewalk.

Explanation:

1. According to Newton's second - law ($F = ma$ where $F$ is net force, $m$ is mass and $a$ is acceleration), with mass constant, a larger net force causes a greater acceleration.
2. An object under balanced forces can be at rest (static equilibrium) or in uniform motion (dynamic equilibrium).
3. Newton's second - law is expressed as $F_{net}=ma$, where $F_{net}$ is the net force acting on an object, $m$ is the mass of the object and $a$ is the acceleration of the object.
4. Newton's third law states that for every action, there is an equal and opposite reaction. For example, when a book is placed on a table, the book exerts a downward force on the table (action), and the table exerts an equal upward force on the book (reaction).
5. When a person walks down a sidewalk, the person's foot exerts a backward force on the sidewalk (action). According to Newton's third law, the sidewalk exerts an equal and opposite forward force on the person's foot, which propels the person forward.

Answer:

1. The larger net force.
2. Rest and uniform motion.
3. $F_{net}=ma$
4. For every action, there is an equal and opposite reaction. Example: Book on a table - book exerts downward force, table exerts upward force.
5. Person's foot exerts backward force on sidewalk (action), sidewalk exerts forward force on person's foot (reaction).