Inertia And Nwetons To ors That Flashcards
What is inertia?
The tendency for motion to remain unchanged until acted on by a resultant force.
According to Newton’s First Law, what happens to objects at rest?
Objects at rest stay at rest until acted on by a resultant force.
What is the definition of inertia in terms of motion?
The tendency to keep moving with the same velocity until acted upon by a force.
How is inertial mass defined?
Inertial mass measures how difficult it is to change the velocity of an object.
How can inertial mass be calculated?
Using Newton’s Second Law, F = ma, where m = F/a.
What does Newton’s Third Law state?
When two objects interact, the forces they exert on each other are equal and opposite.
What happens when you push a shopping trolley?
The trolley will push back against you with equal force.
Why does something move if action and reaction forces are equal?
Because the two forces act on different objects.
In the example of skater A and skater B, which skater accelerates more?
Skater A accelerates more because she has a smaller mass.
What explains the principle of conservation of momentum?
The equally-sized forces in opposite directions acting on different objects.
What occurs when an object is in equilibrium?
The forces acting on it are equal and opposite, resulting in no movement.
What are the forces acting on a book sitting on a table?
The weight of the book pulls it down, and the normal reaction force from the table pushes it up.
How do the forces acting on the book differ from those in Newton’s Third Law?
The forces acting on the book are different types and both act on the book.
What are the pairs of forces according to Newton’s Third Law in the book example?
- The book is pulled down by gravity from Earth
- The book pulls back up on the Earth
- The normal contact force from the table pushes up on the book
- The book pushes down on the table
What is momentum?
Momentum is defined as the product of mass and velocity.
What happens to momentum in a closed system?
The total momentum remains the same.
In the example of snooker balls, what can be observed about momentum?
The momentum of the balls before and after the collision can be compared.
What is a common misconception regarding Newton’s Third Law?
It can be confusing because it involves understanding the forces acting on different objects.
Fill in the blank: A car moving at constant velocity along a road is in _______.
[equilibrium]
Give an example of a pair of forces demonstrating Newton’s Third Law in a car moving at constant velocity.
- The force of the car’s weight downward
- The normal force from the road upward.
