Good. Note the key word velocity. How does that differ from speed?crysland said:
Exactly! So see if you can try to answer the question now.crysland said:
How about a car following any curved path while moving at constant speed? A section of road could be similar to a sine wave, ellipse, spiral, parabola, ..., and a car would be able to follow that path while moving at constant speed.crysland said:
Your answer is definitely correct!crysland said:
Do you remember the expression for centripetal acceleration?crysland said:
That would be speed^2 / (radius of curvature), which gets complicated for paths other than a circle.arildno said:
The simple answer is that centripetal force = centripetal acceleration x mass of the car.crysland said:
External force is a force that acts on an object from outside of the object itself. This force can cause the object to change its motion or shape.
Examples of external forces include gravity, friction, air resistance, and contact forces such as pushing or pulling.
External forces can cause an object to speed up, slow down, change direction, or stop moving altogether. The magnitude and direction of the external force determine how the object's motion will change.
Yes, external forces can cancel each other out if they are equal in magnitude and opposite in direction. This is known as a balanced force and it results in no change in an object's motion.
External forces can cause an object to change its shape by exerting pressure on the object. This can result in stretching, compression, or deformation of the object depending on the direction and magnitude of the external force.