A string is attached to the rear-view mirror of a car. A ball is hanging at the other end of the string. The car is driving around in a circle, at a constant speed. Which of the following lists gives all of the forces directly acting on the ball?Group of answer choicestensiontension and gravitytension, gravity, the centripetal force, and frictiontension, gravity, and the centripetal force
Question
A string is attached to the rear-view mirror of a car. A ball is hanging at the other end of the string. The car is driving around in a circle, at a constant speed. Which of the following lists gives all of the forces directly acting on the ball?Group of answer choicestensiontension and gravitytension, gravity, the centripetal force, and frictiontension, gravity, and the centripetal force
Solution
The forces directly acting on the ball are tension and gravity.
Tension is the force exerted by the string on the ball, pulling it upwards. Gravity is the force pulling the ball downwards towards the center of the Earth.
The centripetal force is not a separate force, but rather the result of the tension force providing the necessary centripetal acceleration for the ball to move in a circle.
Friction is not acting on the ball in this scenario as there is no contact with a surface moving relative to the ball.
So, the correct answer is "tension and gravity".
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