1) A satellite in orbit around Earth is in uniform circular motion. What is the angle between the velocity vector and accelerati
on vector at any given point on the orbit?(1 point) 0º
0º
45º
45º
180º
180º
90º
2) A hammer thrower spins a hammer in a circle. What happens when the centripetal force drops to 0?(1 point)
The centripetal force cannot drop to 0.
The centripetal force cannot drop to 0.
The hammer continues in the circular motion.
The hammer continues in the circular motion.
The hammer drops straight to the ground.
The hammer drops straight to the ground.
The hammer flies off at a tangent to its circular path.
3) A bike racer follows a circular indoor track, racing at constant speed. In what direction is their acceleration, and why?(1 point)
In the direction of motion, accelerating their speed.
In the direction of motion, accelerating their speed.
Counter to the direction of motion, keeping her speed constant.
Counter to the direction of motion, keeping her speed constant.
Inward to the center of the track, the direction of the force needed to keep her on this path.
Inward to the center of the track, the direction of the force needed to keep her on this path.
Outward, the direction she would go if not constrained by the track.
4)A diagram shows the velocity vector for an object in uniform circular motion. Why is the vector tangential to the circle?(1 point)
The vector approximates the curved path at that point.
The vector approximates the curved path at that point.
The vector indicates the direction of the force on the object.
The vector indicates the direction of the force on the object.
The vector shows the path the object would follow if the net force acting on it stopped.
The vector shows the path the object would follow if the net force acting on it stopped.
The vector shows how the object pulls against the centripetal force.
5) A satellite is in uniform circular motion around the Moon. What happens to the direction of the acceleration vector during one full orbit?(1 point)
The acceleration vector always points in the direction of motion.
The acceleration vector always points in the direction of motion.
The acceleration vector always points outward.
The acceleration vector always points outward.
The acceleration vector oscillates back and forth.
The acceleration vector oscillates back and forth.
Since kinetic energy is a form of energy using the equation KE=¹/₂mv², the units of measurement is in Joules (J). Therefore, the tennis ball had more kinetic energy than the baseball since velocity is a larger factor than the mass is when determining kinetic energy.
