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    an object is moving to the right, and experiencing a net force that is directed to the right. the magnitude of the force is decreasing with time. the speed of the object is

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    Conceptual question regarding net force and velocity

    Homework Statement An object is moving to the right in a straight line. The net force acting on the object is also directed to the right, but the...

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    Conceptual question regarding net force and velocity

    Thread starter physics120 Start date Feb 23, 2009 Feb 23, 2009 #1 physics120

    Homework Statement

    An object is moving to the right in a straight line. The net force acting on the object is also directed to the right, but the magnitude of the force is decreasing with time. The object will

    a) stop and then begin moving to the left.

    b) continue to move to the right, with its speed decreasing with time.

    c) continue to move to the right, with its speed increasing with time.

    d) continue to move to the right with a constant speed.

    The answer is c)

    Homework Equations

    Homework Equations The Attempt at a Solution

    My question is, can an object INCREASE in speed to the right at a DECREASING rate?

    If so, then I understand why the answer is c) However, I thought if an object was moving to the right and the net force was also moving to the right, that would mean the object was increasing, and since the net force is decreasing with time, then shouldnt that change how the object is moving? like doesnt that mean the object will begin to decrease in speed?

    Please explain to me the reason for the answer! (why it is c, and say, not b)

    Thank-you for any help!

    Answers and Replies

    Feb 23, 2009 #2 Doc Al Mentor physics120 said:

    My question is, can an object INCREASE in speed to the right at a DECREASING rate?

    Absolutely. As long as it moves to the right and it has an acceleration to the right, it's speed will increase. The at which the speed increases depends on the acceleration, which in turn depends on the net force.

    Feb 23, 2009 #3 Kruum

    Newton's second law: F=ma. What happens, if there is a force acting on the object and what happens when you take it off?

    DocAl was faster! Damn!

    Feb 23, 2009 #4 physics120 Thanks Doc Al! Share:

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    11 An object is moving to the right and experiencing a net force that is

    11 An object is moving to the right and experiencing a net force that is from PSYC MISC at Clemson University

    11 an object is moving to the right and experiencing

    Clemson University PSYC MISC Test Prep LarryHoover 5

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    Fnet, x= max= (1200 kg)(20 m/s2) = 24,000 NB15.In which reference frame are the Newton's laws valid?a.A car moving with constant velocity.b.Non-inertial reference frame.c.Accelerating reference frame.d.Inertial reference frame.e.None of the options listed here.ANS:D

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