Unit 4 Forces ~newton's laws of motion

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What are Contact Forces?

Back

Contact forces are forces that occur when two objects are in physical contact with each other. Examples include friction, tension, and normal force.

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What is Newton's 1st Law of Motion?

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Newton's 1st Law states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity unless acted upon by a net external force.

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What is Newton's 2nd Law of Motion?

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Newton's 2nd Law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It can be expressed with the formula F = ma.

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What is Newton's 3rd Law of Motion?

Back

Newton's 3rd Law states that for every action, there is an equal and opposite reaction. This means that forces always occur in pairs.

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What is the formula to calculate weight?

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Weight can be calculated using the formula: Weight (W) = mass (m) × acceleration due to gravity (g), where g is approximately 9.81 m/s².

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What is Spring Force?

Back

Spring force is the force exerted by a compressed or stretched spring. It follows Hooke's Law, which states that the force exerted by a spring is proportional to its displacement.

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What is Inertia?

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Inertia is the tendency of an object to resist changes in its state of motion. It is directly related to the mass of the object.

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What is the difference between field forces and contact forces?

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Field forces act at a distance without physical contact (e.g., gravitational force), while contact forces require physical interaction between objects.

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How does mass affect acceleration according to Newton's 2nd Law?

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According to Newton's 2nd Law, as mass increases, acceleration decreases for a given force. This means heavier objects require more force to accelerate.

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What is an example of Newton's 3rd Law in everyday life?

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An example of Newton's 3rd Law is when you jump off a small boat; as you push down on the boat to jump up, the boat pushes you back down into the water.