Physical Science Practice Quiz: Trivia

Acceleration is the correct answer because it refers to the rate of change in velocity. Velocity is a vector quantity that includes both speed and direction, so when the velocity of an object changes, it means that either its speed or its direction or both are changing. Acceleration measures how quickly this change in velocity occurs, indicating the rate at which an object is speeding up, slowing down, or changing direction. Therefore, acceleration is the appropriate term to describe the rate of change in velocity.

According to the graph, the speed of the car increases as the distance increases. At 60 cm, the car is located between 200 cm/s and 250 cm/s. Since the speed is increasing, it is logical to assume that the car's speed at 60 cm would be closer to 250 cm/s rather than 200 cm/s. Therefore, the predicted speed of the car at 60 cm would be 250 cm/s.

The correct answer is "slowing down". This can be inferred from the speed vs. time graph. Point C represents a section where the speed of the object is decreasing over time, indicating that it is slowing down.

The acceleration of the car can be calculated using the equation: acceleration = (final velocity - initial velocity) / time. In this case, the final velocity is 0 m/s, the initial velocity is 85 m/s, and the time is 4.5 seconds. Plugging these values into the equation, we get: acceleration = (0 m/s - 85 m/s) / 4.5 s = -85 m/s / 4.5 s = -18.9 m/s². Since acceleration is a vector quantity, the negative sign indicates that the car is decelerating. Therefore, the correct answer is 18.9 m/s².

In 15 minutes, a snail can travel 0.50 meters per minute, so to find the total distance traveled, we multiply the speed by the time. Therefore, 0.50 meters/minute * 15 minutes = 7.5 meters.

The speed you have at a specific point in your journey is best called instantaneous speed because it refers to the speed at a particular moment or instant in time. It is the exact speed at that specific point, whereas average speed is calculated over a period of time. Acceleration refers to the rate at which speed changes, and fastest is a comparative term that does not accurately describe the speed at a specific point.

The speed is the greatest at point 2 because it is the highest point on the graph. As the graph represents speed over time, the higher the point on the graph, the greater the speed. Therefore, point 2 has the highest speed compared to the other points on the graph.

The slope of a distance vs. time graph represents the rate of change of distance with respect to time. In other words, it shows how quickly the distance is changing over time. Speed, which is defined as the distance traveled per unit of time, is directly related to this rate of change. Therefore, the correct answer is speed.

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The x-axis in a graph represents the independent variable. The independent variable is the variable that is intentionally changed or manipulated in an experiment or study. It is the variable that is believed to have an effect on the dependent variable, which is represented on the y-axis. Therefore, the x-axis is most closely related to the independent variable.

The acceleration of an object is calculated by dividing the change in velocity by the time taken. In this case, the change in velocity is 50 m/s - 10 m/s = 40 m/s, and the time taken is 2 seconds. Dividing the change in velocity by the time taken, we get 40 m/s / 2 s = 20 m/s/s. Therefore, the acceleration of the sled is 20 m/s/s.

The speed of an object can be calculated by finding the slope of the position vs. time graph. In this case, the slope of the graph is 0.5m/s, indicating that the object is moving at a constant speed of 0.5 meters per second.

The graph does not show any clear pattern or trend between the variables. The points are scattered randomly, indicating that there is no relationship between the variables.

If the direction and speed of a bicycle rider are unchanged, it means that she is maintaining a constant speed and moving in a straight line without any change in velocity. Acceleration is the rate of change of velocity, so if there is no change in velocity, there is no acceleration. Therefore, the bicycle rider would not be accelerating in this scenario.

The dependent variable in this graph is speed because it is the variable that is being measured and is dependent on the distance. The graph is likely showing how the speed changes as the distance increases or decreases.