Why the minus sign?mailmas said:The Attempt at a Solution
I = 100(20 (j) - 25(i))[/B]
Because these are before and after velocities.rude man said:Why the minus sign?
mailmas said:and then
Oh yes? I interpreted the problem as starting from zero velocity and ending with 25 i + 20 j. The change is just that.haruspex said:Because these are before and after velocities.
You are still ignoring the "and then". These are sequential circumstances.rude man said:Oh yes? I interpreted the problem as starting from zero velocity and ending with 25 i + 20 j. The change is just that.
A car changes speed and direction through the application of forces. When the driver presses the accelerator or brake pedal, the engine produces a force that either increases or decreases the car's speed. Similarly, turning the steering wheel creates a force that changes the car's direction.
Inertia is the tendency of an object to resist changes in its state of motion. In the case of a car changing speed and direction, the car's mass and velocity contribute to its inertia. The more massive the car is, the more force is needed to change its speed or direction.
Friction is the resistance force that opposes motion between two surfaces in contact. In a car, friction is important for maintaining traction and control. When the car's tires grip the road, it can change speed and direction. However, if there is too much friction, it can make it difficult for the car to move or turn.
Acceleration is the rate of change of an object's speed over time. In a car, pressing the gas pedal increases the car's speed, while pressing the brake pedal decreases the speed. Deceleration, on the other hand, is a type of negative acceleration, where the car's speed decreases in a given amount of time.
A car's weight is a measure of the force of gravity acting on the car. The heavier the car is, the more force is needed to change its speed or direction. This is because the car's weight contributes to its inertia, making it more difficult to accelerate or decelerate. However, a heavier car may also have more traction and stability, making it easier to maintain control when changing speed or direction.