Forces and Friction

Who wrote the three laws of motion?

• Sir Isaac Newton
• Albert Einstein
• Galileo Galilei
• Niels Bohr

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Who originally wrote Newton's First Law of Motion?

• Sir Isaac Newton
• Niels Bohr
• Galileo Galilei
• Albert Einstein

What is the cause of motion?

• Inertia is the cause of motion.
• Friction is the cause of motion.
• Force is the cause of motion.
• Gravity is the cause of motion.

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What is the study of motion?

• Statistical Mechanics
• Kinematics
• Dynamics
• Thermodynamics

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What is a universal law?

• A principle or rule that is universally applicable.
• A rule that is often ignored by society.
• A guideline that varies by culture.
• A law that only applies in specific situations.

What is a force?

• A force is a type of energy that cannot be measured.
• A force is a fixed quantity that does not change.
• A force is a push or pull on an object.

• A force is an object that moves on its own.

What is net force?

• The net force is the total force acting on an object, taking into account all individual forces.
• Net force is the force that opposes motion only.
• Net force is the sum of all forces without direction.
• Net force is the force applied by a single object.

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What is an external force?

• A force that does not affect the motion of a system.
• An external force is a force acting on a system from outside that system.
• A force that is always equal to the internal forces.
• A force that only acts within a system.

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What is friction?

• Friction is the force that enhances the motion of two surfaces in contact.
• Friction is the energy lost when two surfaces are in motion.
• Friction is the force that opposes the relative motion of two surfaces in contact.
• Friction is the temperature increase caused by two surfaces rubbing together.

How many types of friction are there?

• Five types of friction
• Four types of friction
• Three types of friction
• Two types of friction