Question

part iv. modified true or false (10 pts) write true if the statement is correct. if it is false, change the underlined word(s) to make it correct. 1. speed is the rate at which position changes with direction. 2. a force is measured in joules. 3. balanced forces cause an object to accelerate. 4. newtons first law is also called the law of gravity. 5. in an inelastic collision, objects bounce and kinetic energy is conserved. 6. gravity pulls objects toward the center of earth. 7. acceleration can be a change in direction, not just speed. 8. force pairs act in equal and opposite directions. 9. the gravitational force becomes weaker as distance increases. 10. velocity is speed with a direction.

Explanation:

1. Speed is a scalar quantity. Velocity is the rate at which position changes with direction.
2. Force is measured in Newtons. Joules are the unit for energy.
3. Balanced forces result in no net force, so no acceleration. Unbalanced forces cause acceleration.
4. Newton's First Law is the law of inertia. The law of gravity is a different concept.
5. In an inelastic collision, objects stick together (not bounce) and kinetic energy is not conserved.
6. Gravity is a force that pulls objects toward the center of Earth.
7. Acceleration is the rate of change of velocity. Since velocity has direction, acceleration can be due to a change in direction.
8. According to Newton's Third Law, force pairs act in equal and opposite directions.
9. The gravitational force follows an inverse - square law. As distance increases, the gravitational force becomes weaker.
10. Velocity is a vector quantity, which is speed with a direction.

Answer:

1. False. Change "Speed" to "Velocity".
2. False. Change "Joules" to "Newtons".
3. False. Change "Balanced forces" to "Unbalanced forces".
4. False. Change "law of gravity" to "law of inertia".
5. False. Change "inelastic collision" to "elastic collision".
6. True.
7. True.
8. True.
9. True.
10. True.