A ball placed on a table starts rolling when table is tilted. Which is the force which causes this motion?

friction

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push by table

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rolling force

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gravitational pull by earth

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Solution

The correct option is D gravitational pull by earth
When the table is tilted as shown in the figure, then the component of gravitational force $m g$ of the bell acts along the inclined surface of the table $(m g sin θ)$ which causes the bell to roll along the table.

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