3. A car goes around a circular road at a constant speed. Which one of the follo

Question

3. A car goes around a circular road at a constant speed. Which one of the following statements concerning the directions of velocity and acceleration is true? (a) Velocity and acceleration are the same direction (b) Velocity is perpendicular to the acceleration (c) Velocity and acceleration are in opposite directions (180 degrees apart) (d) Not enough information to determine the directions. 4. If you exert a horizontal 100-N force on a crate and it slides along a factory flow AT CONSTANT VELOCITY, then the magnitude of the force of friction between the crate and the floor is (a) somewhat less than 100 N (b) 100 N (c) somewhat more than 100 N (d) something that can't be known, only guessed

Explanation / Answer

(3)

The direction of velocity is always along the tangent at the point on the circular path. In addition to that, the direction of acceleration is towards center of the circular path. Therefore, the velocity and accelerations are perpendicular to each other. So option (b) is correct.

(4)

The net force acting on the crate is equal to zero when it is moving with constant velocity. In other words, applied force is equal to frictional force. Therefore, the frictional force is equal to 100 N. So correct option is (b).

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