Mr W's Online Physics Quiz 2

The SI unit to measure force is the Newton. The Newton is defined as the amount of force required to accelerate a one-kilogram mass by one meter per second squared. It is named after Sir Isaac Newton, who formulated the laws of motion. The Newton is widely used in physics and engineering to quantify forces and their effects.

Distance refers to the total length covered along a path, regardless of direction. It is a scalar quantity that only considers the magnitude of the travel. Displacement, on the other hand, refers to the change in position from the starting point to the ending point, taking into account both magnitude and direction. Position refers to the specific location of an object at a given time. Motion refers to the act of moving or changing position. Therefore, distance is the correct answer as it specifically refers to how far one travels along a path.

Distance refers to the total length covered along a path, regardless of the direction. It is a scalar quantity and is measured in units such as meters or kilometers. In the context of the given question, distance represents the total amount of travel along a path, without considering any changes in direction or position.

The correct answer is m/s^2 or m/s/s. Acceleration is the rate at which an object changes its velocity. It is measured in meters per second squared (m/s^2) or meters per second per second (m/s/s). This unit indicates the change in velocity per unit of time. The other units listed, such as m/s and km/min, measure velocity and not acceleration. Therefore, the correct unit to measure or indicate acceleration is m/s^2 or m/s/s.

A reference point is an object or location that is used to determine one's position, location, or motion. It serves as a fixed point of comparison, allowing us to understand our own movement or change in position relative to it. By using a reference point, we can establish a frame of reference and measure distances, displacements, or changes in position accurately. It helps in navigation, tracking, and understanding the movement of objects or individuals in relation to a known point.

Acceleration refers to how quickly an object changes its velocity, which includes both its speed and direction. It measures the rate of change of velocity over time. Therefore, acceleration is the correct answer to the question.

A graph with speed on the Y-axis and time on the X-axis is a graph showing acceleration. Acceleration is the rate at which an object changes its velocity over time. In this graph, the slope of the line represents the change in speed over time, indicating the acceleration of the object.

The average speed for the whole afternoon can be calculated by dividing the total distance traveled by the total time taken. In this case, the total distance traveled is 7 km + 5 km + 6 km = 18 km, and the total time taken is 1 hour + 1 hour + 1 hour = 3 hours. Therefore, the average speed is 18 km / 3 hours = 6 km/hr or 6 kph.

To determine the storm's velocity, you would need to know both its speed and direction. Speed refers to how fast the storm is moving, while direction indicates the path it is taking. By knowing both speed and direction, you can calculate the storm's velocity vector, which gives the magnitude and direction of its motion. Displacement, distance, and acceleration are not directly related to determining the storm's velocity.

A graph showing distance on the Y-axis and time on the X-axis is a speed graph because speed is defined as the distance traveled per unit of time. By plotting distance against time, we can determine the speed at which an object is moving.

The unit "m/s" indicates velocity. In this case, the addition of "West" indicates the direction of the velocity, making it a vector quantity.