SC-1147
Contact and non-contact forces
Lower Sec Science · Secondary 2 · Medium · Contact and non-contact forces
After you rub a balloon on your hair, it becomes charged. When you bring it close to a wall, the balloon moves towards the wall even before touching it. What mainly causes this motion?
- A non-contact electrostatic force between the balloon and the wall
- A contact frictional force between the balloon and the wall
- A contact push force from the surrounding air on the balloon
- A contact force caused by the wall vibrating and hitting the balloon
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