Return to Question

If an objects mass, when measured in its frame of reference (even if that frame is moving), is invariant, then why does it require more and more energy to accelerate it? I can understand this when measured by an observer in a reference frame in relative motion to it, they would measure the mass as increased but to the moving object, there would be no change. I'm running myself in circles a little bit here but maybe someone can help?

If an object's mass, when measured in its frame of reference (even if that frame is moving), is invariant, then why does it require more and more energy to accelerate it? I can understand this when measured by an observer in a reference frame in relative motion to it, they would measure the mass as increased but to the moving object, there would be no change. I'm running myself in circles a little bit here but maybe someone can help?

If an objects mass when measured in its frame of reference (even if that frame is moving) is invariant then why does it require more and more energy to accelerate it. I can understand this when measured by an observer in a reference frame in relative motion to it, they would measure the mass as increased but to the moving object, there would be no change. I'm running myself in circles a little bit here but maybe someone can help?

Thank you

David

If an objects mass, when measured in its frame of reference (even if that frame is moving), is invariant, then why does it require more and more energy to accelerate it? I can understand this when measured by an observer in a reference frame in relative motion to it, they would measure the mass as increased but to the moving object, there would be no change. I'm running myself in circles a little bit here but maybe someone can help?