Suppose you're riding the bus one day. All the seats were taken, so you're standing in the aisle, facing the front of the bus, while the the bus is moving. Suddenly, the bus driver slams on the brakes and you fly forward! Which of the following forces pushed you to the front of the bus? The force of static friction between you and the floor of the bus. No force pushed you to the front of the bus. An applied force of the bus. The force of gravity.
Question
Suppose you're riding the bus one day. All the seats were taken, so you're standing in the aisle, facing the front of the bus, while the the bus is moving. Suddenly, the bus driver slams on the brakes and you fly forward! Which of the following forces pushed you to the front of the bus? The force of static friction between you and the floor of the bus. No force pushed you to the front of the bus. An applied force of the bus. The force of gravity.
Solution
The correct answer is "No force pushed you to the front of the bus." This is due to the concept of inertia. Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion.
When the bus was moving, your body was also moving at the same speed as the bus. When the bus suddenly stopped, your body wanted to keep moving forward due to inertia. This is why you "flew" forward. It's not that a force pushed you forward, it's that no force was there to stop you from continuing your forward motion when the bus stopped.
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