Force, inertia, and momentum are fundamental concepts in dynamics that describe the motion of objects. Force is defined as a push or pull that can cause an object to move, stop, or change direction. Inertia is the property of an object that resists changes to its state of rest or uniform motion, with greater mass resulting in greater inertia. Momentum, on the other hand, is the quantity of motion an object possesses, calculated as the product of its mass and velocity (P = mv). Together, these concepts help explain how and why objects move, interact, and respond to various forces in their environment, forming the basis of Newton's laws of motion.
What is force?
Force is a push or pull that can cause an object to move, stop, or change its direction. It is measured in newtons (N).
How is inertia defined?
Inertia is the property of an object that resists changes to its state of rest or uniform motion. The greater the mass of an object, the greater its inertia.
What is momentum?
Momentum is the quantity of motion an object possesses, calculated as the product of its mass and velocity (P = mv). It is a vector quantity, meaning it has both magnitude and direction.
How does mass affect inertia?
Mass directly affects inertia; an object with a larger mass has greater inertia, making it more resistant to changes in its motion compared to an object with a smaller mass.
What is Newton's first law of motion?
Newton's first law states that a body at rest remains at rest, and a body in motion continues in motion with the same speed and in the same direction unless acted upon by a net external force.
What is the SI unit of force?
a) Joule
b) Newton
c) Pascal
d) Watt
Answer: b) Newton
Which of the following best describes inertia?
a) The tendency of an object to change its velocity
b) The resistance of an object to any change in its state of motion
c) The force acting on an object
d) The speed of an object in a given direction
Answer: b) The resistance of an object to any change in its state of motion
What is the formula for momentum?
a) P = F × t
b) P = m × a
c) P = m × v
d) P = F × d
Answer: c) P = m × v
According to Newton's first law of motion, an object at rest will remain at rest unless:
a) A force is applied
b) It is acted upon by another object
c) It is in a vacuum
d) It is in motion
Answer: a) A force is applied
Which of the following statements is true about momentum?
a) Momentum is a scalar quantity.
b) Momentum is always conserved in a closed system.
c) Momentum can only be calculated for moving objects.
d) Momentum is independent of mass and velocity.
Answer: