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Which of the following is an example of an object moving in uniform circular motion?
A bird flying in the sky
A person walking on a sidewalk
A satellite in a circular orbit around the earth.
A car driving straight on a highway
A satellite in a circular orbit around the earth.
Uniform circular motion refers to the motion of an object traveling at a constant speed along a circular path. Since the direction of motion continuously changes, the velocity is not constant, even though the magnitude of the speed remains uniform.
Uniform circular motion refers to the motion of an object traveling at a constant speed along a circular path. Since the direction of motion continuously changes, the velocity is not constant, even though the magnitude of the speed remains uniform.
A satellite orbiting Earth is like a ball attached to a string being whirled around your head; the gravity (or string tension) constantly 'pulls' the object toward the center to keep it on its circular track.
v=T2╧АrтАЛ тАФ Velocity in circular motion
acтАЛ=rv2тАЛ тАФ Centripetal acceleration
In uniform circular motion, a centripetal force (FcтАЛ=rmv2тАЛ) acts radially inward toward the center of the circular path. This force changes the direction of the object's velocity vector at every point without changing its speed, resulting in centripetal acceleration (acтАЛ=rv2тАЛ).
Speed is constant, but velocity is variable due to constant change in direction.
Acceleration is always directed toward the center of the circular path.
The centripetal force is responsible for maintaining the path.
Satellite orbits around planets
Electron motion around a nucleus (Bohr model)
Uniform circular motion is an accelerated motion because velocity changes as direction changes.
Option A (Bird flying) involves variable speed and direction.
Option B (Person walking) is typically rectilinear motion.
Option D (Car driving straight) is linear motion (non-circular).
C is correct тАФ A satellite in a circular orbit moves at a constant speed along a circular path, which is the definition of uniform circular motion.
Remember that in physics, any change in direction implies acceleration, even if the speedometer reading remains constant!
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