6. When a ball is thrown up into the air, what two forces are at work?
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1 point
a Air Resistance
b Friction
c Inertia
a Air Resistance
c Inertia
When a ball is thrown up into the air, two forces that are at work are:
1. Gravity: Gravity is pulling the ball downwards towards the Earth. This force acts in the opposite direction to the ball's motion, causing it to slow down and eventually start falling back towards the ground.
2. Air Resistance: As the ball moves through the air, it encounters resistance from the air molecules. This force opposes the ball's motion, making it harder for the ball to move through the air. The effect of air resistance becomes more noticeable as the ball's speed increases or if it has a larger surface area.
When a ball is thrown up into the air, two forces that are at work are:
a) The force of gravity, which pulls the ball downwards towards the Earth.
b) The force exerted by the person throwing the ball, which propels the ball upward.
To understand this, let's break it down step by step:
1. When the ball is thrown up, a force is applied to it by the person's hand. This force overcomes the force of gravity and propels the ball upwards.
2. As the ball moves upward, gravity continues to act on it and tries to pull it back down towards the ground. This force of gravity is constantly working against the upward motion of the ball.
3. Additionally, another force that comes into play is air resistance. As the ball moves through the air, it encounters resistance from the air molecules. This resistance slows down the ball's upward motion and ultimately affects its trajectory.
4. Inertia is not a force, but rather a property of matter. It is the tendency of an object to resist any changes in its state of motion. In this case, the ball's inertia plays a role in its upward trajectory, as it initially resists the change from being at rest to being thrown upward.
So, to summarize, the two forces at work when a ball is thrown up into the air are the force of gravity and the force applied by the person throwing the ball.