Physics - Newton's Laws

Define inertia.

• Inertia is the property of an object to resist changes in its state of motion. It is the tendency of an object to remain at rest or to continue moving at a constant velocity unless acted upon by an external force.

• Inertia is the force that causes objects to move in a circular path.

• Inertia is the energy required to change the temperature of an object.

• Inertia is the gravitational pull experienced by an object.

Define mass.

• Mass is a measure of the amount of matter in an object, typically measured in kilograms or grams.

• Mass is the force exerted by an object due to gravity.

• Mass is the volume of an object.

• Mass is the density of an object.

Define force.

• Force is an interaction that, when unopposed, will change the motion of an object. It can cause an object with mass to change its velocity (to accelerate) or to deform.

• Force is a type of energy that is stored in an object and can be released to do work.

• Force is a measure of the amount of matter in an object, typically measured in kilograms.

• Force is the ability of an object to resist changes in its state of motion.

Define net force.

• Net force is the vector sum of all the individual forces acting on an object. It determines the object's acceleration according to Newton's second law of motion.

• Net force is the scalar sum of all the individual forces acting on an object.

• Net force is the difference between the largest and smallest forces acting on an object.

• Net force is the force required to keep an object at rest.

Define balanced forces.

• Balanced forces are forces that are equal in size, but opposite in direction. When balanced forces act on an object, they do not cause a change in the object's motion.

• Balanced forces are forces that are unequal in size and act in the same direction, causing a change in the object's motion.

• Balanced forces are forces that are equal in size and act in the same direction, causing acceleration.

• Balanced forces are forces that are unequal in size and act in opposite directions, causing deceleration.

Define static equilibrium.

• Static equilibrium refers to a state in which an object is at rest and remains at rest, with all the forces acting on it balanced, resulting in no net force or net torque.

• Static equilibrium refers to a state in which an object is moving at a constant velocity with balanced forces.

• Static equilibrium refers to a state in which an object is accelerating due to unbalanced forces.

• Static equilibrium refers to a state in which an object is at rest but with unbalanced forces acting on it.

Define dynamic equilibrium.

• Dynamic equilibrium is a state in which the rates of forward and reverse reactions are equal, resulting in no net change in the concentration of reactants and products over time.

• Dynamic equilibrium is a state where only the forward reaction occurs, leading to a constant increase in product concentration.

• Dynamic equilibrium is a condition where the reverse reaction is faster than the forward reaction, causing a decrease in reactant concentration.

• Dynamic equilibrium is a scenario where reactions stop completely, and concentrations remain constant due to inactivity.

Answer explanation

Dynamic equilibrium occurs when the rates of forward and reverse reactions are equal, leading to stable concentrations of reactants and products. This distinguishes it from scenarios where reactions stop or only one direction occurs.

Define weight.

• Weight is the force exerted by gravity on an object, typically measured in units such as pounds or kilograms.

• Weight is the mass of an object divided by its volume.

• Weight is the amount of matter in an object, measured in grams or kilograms.

• Weight is the energy stored in an object due to its position.

Answer explanation

The correct definition of weight is the force exerted by gravity on an object, which is why it is measured in pounds or kilograms. The other options describe mass, density, or potential energy, not weight.

State Newton's First law of motion.

• Newton's First law of motion states that an object at rest will remain at rest, and an object in motion will continue in motion with the same speed and in the same direction unless acted upon by a net external force.

• Newton's First law of motion states that an object will change its state of motion only when a net external force is applied.

• Newton's First law of motion states that an object will always remain in motion unless stopped by a force.

• Newton's First law of motion states that an object at rest will start moving spontaneously without any force.

Answer explanation

The correct choice accurately describes Newton's First law, emphasizing that an object remains at rest or in uniform motion unless a net external force acts on it, highlighting the concept of inertia.

State Newton's Second law of motion.

• Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This can be expressed with the formula F = ma, where F is the net force, m is the mass, and a is the acceleration.

• Newton's Second Law of Motion states that every action has an equal and opposite reaction.

• Newton's Second Law of Motion states that 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 an unbalanced force.

• Newton's Second Law of Motion states that the force of gravity is proportional to the product of the masses and inversely proportional to the square of the distance between their centers.

Answer explanation

The correct choice accurately describes Newton's Second Law, stating that acceleration is proportional to net force and inversely proportional to mass, summarized by the formula F = ma.