Dynamics: Newton's Laws of Motion

What is Newton's first law of motion?

• An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

• An object will accelerate if no force is applied to it

• An object will move in a circular path unless acted upon by an external force

• Objects in motion will eventually come to a stop without any external force

State Newton's second law of motion.

• F = ma

• F = mv

• F = a/m

• F = 2ma

What is the formula for calculating force according to Newton's second law?

• F = m * a

• F = m + a.

• F = m / a

• F = m ^ a

Explain Newton's third law of motion with an example.

• Newton's third law states that every action has an unequal reaction

• An example of Newton's third law is when you walk. As you push back on the ground with your foot (action), the ground pushes forward on you with an equal force (reaction), propelling you forward.

• Newton's third law is about the force of gravity

• An example of Newton's third law is when a car accelerates

What is the SI unit of force?

• Watt

• Joule

• Volt

• Newton (N)

How does an object behave if the net force acting on it is zero?

• The object will shrink in size.

• The object will change direction randomly.

• The object will accelerate indefinitely.

• The object will either remain at rest or continue to move at a constant velocity in a straight line.

Define inertia in the context of Newton's laws of motion.

• Inertia is the acceleration of an object.

• Inertia is the force acting on an object in motion.

• Inertia is the energy stored in an object.

• Inertia is the resistance of an object to changes in its state of motion.

What is the relationship between acceleration and force according to Newton's second law?

• Force is inversely proportional to acceleration

• Force is directly proportional to acceleration

• Force and acceleration are unrelated

• Acceleration causes force

Give an example of a situation where all three of Newton's laws of motion are demonstrated.

• A car accelerating on a straight road

• A ball rolling down a hill

• A person walking on a treadmill

• A rocket launching into space

Explain the concept of action and reaction forces in Newton's third law.

• Action and reaction forces in Newton's third law refer to the equal and opposite forces that two interacting objects exert on each other.

• Action and reaction forces are always unequal in magnitude.

• Action and reaction forces act on different objects.

• Action and reaction forces do not follow the principle of conservation of momentum.