Question

Acceleration is
• (1 point)
• An object's direction's rate of change
• An object's speed when its motion is constant
• An object's speed in a specific direction
• An object's velocity's rate of change

Answer 1

A motorcycle goes north at 40 miles per hour. A car goes South at 40 miles per hour on the same street. Which statement is true?
• The vehicles have the same velocity, but not the same speed.
• The vehicles have the same speed, but different velocity.
• The vehicles have the same speed and velocity.
• The vehicles are going in opposite directions, so their speed is not
the same.

Answer 2

What do unbalanced forces do? (1 point)
• Unbalanced forces cannot change an object's direction.
• Unbalanced forces cause an object's motion to change.
• Unbalanced forces allow an object's motion to stay the same.
Unbalanced forces can make an object move in the opposite direction of the force that is applied.

Answer 3

In a boat race, the boats all sail the same distance. In addition to the distance covered, what information is necessary to calculate the winner? (1 point)
• Each boat's size
• The wind's speed
• The time each boat takes to get to the finish line
• The skill of each boat's crew

Answer 4

The correct answer is:

• An object's velocity's rate of change

Acceleration refers to the rate at which an object's velocity changes over time.

Answer 5

The correct statement is:

• The vehicles have the same speed, but different velocity.

Although both the motorcycle and the car are traveling at 40 miles per hour, they are moving in opposite directions, which means their velocities are different.

Answer 6

The correct answer is:

• Unbalanced forces cause an object's motion to change.

Unbalanced forces result in a change in the speed or direction of an object's motion.

Answer 7

The correct answer is:

• The time each boat takes to get to the finish line.

To determine the winner of the race, you need to know how long each boat took to cover the same distance.