Physics: Acceleration and Velocity
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Questions and Answers

What is acceleration?

Acceleration is the rate of change of velocity.

Acceleration can occur when an object changes its speed, its direction, or both.

True

Accelerations occurs when an object changes its speed, its direction, or __________.

both

When an object is slowing down, what type of acceleration does it experience?

<p>Negative acceleration</p> Signup and view all the answers

How is acceleration calculated?

<p>Acceleration is calculated by dividing the change in velocity by the time interval over which the change occurred.</p> Signup and view all the answers

Match the following accelerations with their corresponding scenarios:

<p>Positive acceleration = Jet airliner speeding up from rest Negative acceleration = Skateboarder slowing down to a stop No acceleration = Horse moving at a constant speed in a carousel</p> Signup and view all the answers

Study Notes

Acceleration

  • Acceleration is the rate of change of velocity.
  • A change in velocity can be either a change in speed (how fast something is moving) or a change in direction.

Speeding Up and Slowing Down

  • Acceleration occurs when an object changes its speed, direction, or both.
  • If the acceleration is in the same direction as the velocity, the speed increases and the acceleration is positive.
  • If the speed decreases, the acceleration is in the opposite direction from the velocity, and the acceleration is negative.

Changing Direction

  • A change in velocity can be either a change in how fast something is moving or a change in the direction of movement.
  • Any time a moving object changes direction, its velocity changes, and it is accelerating.

Calculating Acceleration

  • To calculate the acceleration of an object, the change in velocity is divided by the length of time interval over which the change occurred.
  • If the direction of motion doesn't change and the object moves in a straight line, the change in velocity is the same as the change in speed.
  • The change in velocity then is the final speed minus the initial speed.

Calculating Positive Acceleration

  • The acceleration for an object that is speeding up is positive.
  • The final speed is greater than the initial speed, and the acceleration is positive.

Calculating Negative Acceleration

  • The acceleration for an object that is slowing down is negative.
  • The final speed is less than the initial speed, and the acceleration is negative.

Amusement Park Acceleration

  • Engineers use the laws of physics to design amusement park rides that are thrilling but harmless.
  • Steel roller coasters can offer multiple steep drops and inversion loops, which give the rider large accelerations.
  • Acceleration occurs when riders go around a sharp turn, making them feel as if a force is pushing them toward the side of the car.

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Description

Understand the concept of acceleration, its relation to velocity, and how it occurs when an object changes its speed or direction.

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