Final Physics Review

What is the significance of the net force?

• It is the total mass of an object.

• It is the vector sum of all forces acting on an object, determining its acceleration according to Newton's Second Law.

• It is the force that opposes motion.

• It is the force that acts only when an object is at rest.

What is the difference between static and kinetic friction?

• Static friction acts on an object at rest, preventing it from moving, while kinetic friction acts on an object in motion.

• Static friction only occurs when an object is in motion, while kinetic friction occurs when an object is at rest.

• Static friction is always greater than kinetic friction regardless of the situation.

• Kinetic friction is the force that prevents an object from starting to move, while static friction is the force that acts on a moving object.

What is the acceleration due to gravity on Earth?

• Approximately 9.8 m/s².

• Approximately 8.5 m/s².

• Approximately 10.2 m/s².

• Approximately 9.0 m/s².

What is Newton's First Law of Motion?

• An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a net external force.

• An object will accelerate in the direction of the net force acting on it.

• For every action, there is an equal and opposite reaction.

• An object in motion will eventually come to a stop unless acted upon by an external force.

What is uniform acceleration?

• Uniform acceleration occurs when an object's velocity changes at a constant rate.

• Uniform acceleration occurs when an object's speed remains constant.

• Uniform acceleration occurs when an object moves in a circular path.

• Uniform acceleration occurs when an object's velocity fluctuates randomly.

What is Newton's Second Law of Motion?

• The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. (F = ma)

• An object in motion stays in motion unless acted upon by an external force.

• The total momentum of a closed system remains constant unless acted upon by an external force.

• For every action, there is an equal and opposite reaction.

Define potential energy.

• Potential energy is the energy of motion in an object.

• Potential energy is the energy stored in an object due to its position or configuration.

• Potential energy is the energy released during a chemical reaction.

• Potential energy is the energy associated with the temperature of an object.

What is Newton's Third Law of Motion?

• For every action, there is an equal and opposite reaction.

• Objects in motion stay in motion unless acted upon by an external force.

• The acceleration of an object is directly proportional to the net force acting on it.

• Energy cannot be created or destroyed, only transformed.

What is kinetic energy?

• The energy of an object due to its motion, calculated as KE = 0.5mv².

• The energy stored in an object due to its position.

• The energy released during a chemical reaction.

• The energy associated with the temperature of an object.

What is the coefficient of friction?

• A dimensionless scalar value that represents the frictional force between two bodies in contact.

• A measure of the weight of an object.

• The ratio of the mass of an object to its volume.

• A constant value that varies with temperature.