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College Forces and Motion Questions

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College Forces and Motion
The sum of all the external forces on a system of particles is zero. Which of the
following must be true of the system?
1. The total mechanical energy is constant.
2. The total potential energy is constant.
3. The total kinetic energy is constant.
4. The total linear momentum is constant.
5. It is in static equilibrium.
College Forces and Motion
If a particle moves in a plane so that its position is described by the functions
$x=Acosomegat$ and $y=Asinomegat$, the particle is
1. moving with constant speed along a circle.
2. moving with varying speed along a circle.
3. moving with constant acceleration along a straight line.
4. moving along a parabola.
5. oscillating back and forth along a straight line.
College Forces and Motion
A football is tossed up into the air in the +y direction. Which of the following is true at the point where the football reaches the ground?
1. the velocity of the ball is negative and the acceleration is negative
2. the velocity of the ball is negative and the acceleration is positive
3. the velocity of the ball is positive and the acceleration is negative
4. the velocity of the ball is positive and the acceleration is positive
5. the velocity of the ball is zero and the acceleration is negative
College Forces and Motion
Aristotle incorrectly taught that earth and water fall with a constant velocity to reach their
1. Lowest Point
2. Natural Place
3. Least Resistant Path
4. Terminal Velocity
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