The correct answers are B, C and E.
Explanation:
Centripetal force: It is the force which is required to keep the body in a circular motion. Otherwise, the body will follow straight line path. It makes the body to follow curved path.
The direction of the centripetal force is towards the center of the circle.
From the given options, the correct statements about the centripetal force are as follows;
Without centripetal force, an object would continue in straight line.
Friction can be centripetal force, such as when it keeps a car on road going around a curve. This force causes the car to turn in a circular path. It is due to friction between tires and road.
Gravity can be centripetal force, such as when it pulls a thrown baseball down to ground. For example, when the moon moves around the earth then the gravitational force is equal the centripetal force which keeps the moon moving in the circular path around the earth. Here, the centripetal force is gravity.
Therefore, the correct options are B, C and E.