11.3 Acceleration Answer Key

Question: The rate at which velocity changes is called ________?

Answer: acceleration

Question: In terms of speed and direction, in what ways can an object acceleration?

Answer: It can change its speed, direction, or both.

Question: Because acceleration is a quantity that has both magnitude and direction, it is a(n) _______.

Answer: vector

Question: Is the following true or false? Acceleration is the result of increases or decreases in speed.

Answer: false

increases or decreases in speed and direction.

Question: Ignoring air resistance, a rock in free fall will have a velocity of ________ after 4.0 seconds.

Answer: 39.2 m/s

acceleration of gravity=9.8 m/s ^2

Question: A horse on a carousel that is moving at a constant speed is accelerating because ______________.

Answer: its direction is constantly changing

Question: Describe constant acceleration.

Answer: constant acceleration is a steady change in velocity

Question: Type the equation used to calculate the acceleration of an object.

Answer: Acceleration=change in velocity/total time

or

final velocity- initial velocity/ change in time

Question: Is the following sentence true or false? When the final velocity is less than the initial velocity of an object, the acceleration is negative.

Answer: true

Question: A skateboarder begins down a ramp at a speed of 1.0 m/s. After 3 seconds, her speed has increased to 40 m/s. Calculate her acceleration.

Answer: 1.0 m/s