physics

kinematics

accuracy vs precision

accuracy vs precision

Accuracy refers to how close a measured or calculated value is to its true value. For example, if a person's weight is actually 150 pounds, a scale that reads 150 pounds is accurate. On the other hand, if the scale reads 140 pounds, it is not accurate.

Precision refers to how consistent a measurement or calculation is. For example, if a person weighs themselves multiple times on the same scale and gets readings of 149, 150, and 151 pounds, the scale is precise. However, if the readings are 140, 150, and 160 pounds, the scale is not precise.

Another example of precision is a marksman hitting the same spot on a target multiple times, even if it is not the correct spot. Accuracy, in this case, would be hitting the correct spot on the target.

differentiate between instananeous speed and velocity

Instantaneous speed is the magnitude of the velocity of an object at a particular moment in time,

while velocity is the speed of an object in a specific direction. In other words, velocity includes both the speed and direction of an object,

while instantaneous speed only refers to the magnitude of the speed at a specific moment.

explain why acceleration can involve a change in direction, a change in speed or both

Acceleration is the rate of change of velocity. Velocity is a vector quantity that has both magnitude and direction. Therefore, any change in velocity, whether it is a change in speed, direction, or both, will result in acceleration. For example, a car moving in a straight line that speeds up or slows down experiences acceleration. Similarly, a car turning a corner experiences acceleration because its direction is changing. Finally, a car that is both turning a corner and speeding up or slowing down experiences acceleration due to both changes in speed and direction.

mathematically relate acceleration and velocity

The relationship between acceleration and velocity is given by the equation:

a = dv/dt

where a is acceleration, v is velocity, and t is time. This equation states that acceleration is the rate of change of velocity with respect to time. In other words, acceleration is the change in velocity per unit time.

apply newton's 3 laws of motion in explaining the interaction of forces between objects and their states of motion

Sure, here's a brief explanation of how Newton's 3 laws of motion apply to the interaction of forces between objects and their states of motion:

1. Law of Inertia: An object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force. This means that if there are no external forces acting on an object, it will maintain its current state of motion (either at rest or moving at a constant velocity).

2. Law of Acceleration: The acceleration of an object is directly proportional to the force applied to it, and inversely proportional to its mass. This means that the greater the force applied to an object, the greater its acceleration will be, and the more massive an object is, the less it will accelerate for a given force.

3. Law of Action-Reaction: For every action, there is an equal and opposite reaction. This means that when two objects interact, they exert equal and opposite forces on each other.

By applying these laws, we can explain how forces interact between objects and affect their states of motion.

relate the magnitude of acceleration to the net force on an object and the object

The magnitude of acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the mass of the object. This relationship is described by Newton's second law of motion, which states that the acceleration of an object is equal to the net force acting on it divided by its mass. Therefore, the greater the net force acting on an object, the greater its acceleration will be, and the greater the mass of the object, the smaller its acceleration will be for a given net force.

apply the concepts of speed, velocity and acceleration in discussing the movement of observed objects under various steady and changing conditions

Speed is the rate at which an object moves, while velocity is the speed of an object in a given direction. Acceleration is the rate at which an object changes its velocity. When observing objects under steady conditions, their speed and velocity remain constant. However, under changing conditions, such as when an object is accelerating or decelerating, its speed and velocity will change accordingly. Acceleration can be positive (speeding up) or negative (slowing down). By applying these concepts, we can accurately describe and predict the movement of observed objects.

what is inertia with examples

Inertia is the tendency of an object to resist changes in its state of motion. An object at rest will remain at rest, and an object in motion will continue moving at a constant velocity, unless acted upon by an external force. Examples of inertia include a book at rest on a table, a moving car continuing to move forward even when the driver hits the brakes, and a person's body moving forward when a car suddenly stops.