1. A pen knocked off a desk: This is an example of acceleration. When the pen is knocked off the desk, it starts to move and its speed increases due to gravity. Acceleration is defined as a change in velocity, which includes speed or direction. In this case, the pen's speed is changing, so it is accelerating.

2. An ice skater gliding in a straight line, gently slowing down: This is also an example of acceleration. Even though the skater is slowing down, this is considered negative acceleration, or deceleration. The skater's speed is changing, so they are accelerating.

3. A statue, unmoving, in the park: This is not an example of acceleration. The statue is not moving, so its speed and direction are not changing. Therefore, it is not accelerating.

4. A skydiver at terminal velocity – when air resistance stops them going any faster: This is not an example of acceleration. Terminal velocity is the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration. So, the skydiver is not accelerating.

5. A car turning a corner: This is an example of acceleration. Even if the car is moving at a constant speed, its direction is changing as it turns the corner. Since acceleration is a change in velocity, which includes speed or direction, the car is accelerating.

Question

1. A pen knocked off a desk: This is an example of acceleration. When the pen is knocked off the desk, it starts to move and its speed increases due to gravity. Acceleration is defined as a change in velocity, which includes speed or direction. In this case, the pen's speed is changing, so it is accelerating.

2. An ice skater gliding in a straight line, gently slowing down: This is also an example of acceleration. Even though the skater is slowing down, this is considered negative acceleration, or deceleration. The skater's speed is changing, so they are accelerating.

3. A statue, unmoving, in the park: This is not an example of acceleration. The statue is not moving, so its speed and direction are not changing. Therefore, it is not accelerating.

4. A skydiver at terminal velocity – when air resistance stops them going any faster: This is not an example of acceleration. Terminal velocity is the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration. So, the skydiver is not accelerating.

5. A car turning a corner: This is an example of acceleration. Even if the car is moving at a constant speed, its direction is changing as it turns the corner. Since acceleration is a change in velocity, which includes speed or direction, the car is accelerating.

Knowee AI · Accepted Answer

1. A pen knocked off a desk: This is an example of acceleration. When the pen is knocked off the desk, it starts to move and its speed increases due to gravity. Acceleration is defined as a change in velocity, which includes speed or direction. In this case, the pen's speed is changing, so it is accelerating.

2. An ice skater gliding in a straight line, gently slowing down: This is also an example of acceleration. Even though the skater is slowing down, this is considered negative acceleration, or deceleration. The skater's speed is changing, so they are accelerating.

3. A statue, unmoving, in the park: This is not an example of acceleration. The statue is not moving, so its speed and direction are not changing. Therefore, it is not accelerating.

4. A skydiver at terminal velocity – when air resistance stops them going any faster: This is not an example of acceleration. Terminal velocity is the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration. So, the skydiver is not accelerating.

5. A car turning a corner: This is an example of acceleration. Even if the car is moving at a constant speed, its direction is changing as it turns the corner. Since acceleration is a change in velocity, which includes speed or direction, the car is accelerating.

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