(a)
Whether the work done by the force is positive, negative or zero when a ball is moving upward, acted on by a downward gravitational force and whether the kinetic energy of the ball increases, decreases or remains the same.
(b)
Whether the work done by the force is positive, negative or zero when a ball is falling downward, acted on by a downward gravitational force and whether the kinetic energy of the ball increases, decreases or remains the same.
(c)
Whether the work done by the force is positive, negative or zero when a car is moving rapidly to the left and Superman exerts a force on it to the right to slow it down and whether the kinetic energy of the ball increases, decreases or remains the same.
(d)
Whether the work done by the force is positive, negative or zero when a ball is thrown downward, acted on by the force of the person’s hand on the ball while they are in contact and whether the kinetic energy of the ball increases, decreases or remains the same.
(e)
Whether the work done by the force is positive, negative or zero during the circular motion of the Earth acted upon by the gravitational force by the Sun and whether the kinetic energy of the ball increases, decreases or remains the same.
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MATTER+INTERACTIONS(LL)+WILEYPLUS
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