Physics Unit 3 Flashcards

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Questions and Answers

Define the term force. What is the SI Unit for force?

Force is a push or pull that acts on an object, the SI Unit for force is newton (N).

What two ways can the SI unit for force be written?

N or kg x m/s^2

What happens when an unbalanced force acts on an object?

The object will accelerate.

What happens when a pair of balanced forces act on an object in opposite directions?

No motion for the object. Signup and view all the answers

What happens when a net force of zero acts on an object?

No motion for the object. Signup and view all the answers

What is static friction?

It acts on objects that aren't moving in a direction opposite to the applied force. Signup and view all the answers

What is sliding friction?

It opposes the direction of a moving object as it slides over a surface, and it is less force than static friction. Signup and view all the answers

What is gravitational force?

An attractive force that acts between any two masses, the weakest universal force. Signup and view all the answers

What is electromagnetic force?

It is associated with charged particles, where like charges repel and different charges attract one another. Signup and view all the answers

What is nuclear force?

Forces that act within the nucleus to hold the protons and neutrons together. Signup and view all the answers

What is Newton's 1st law?

(Law of Inertia) An object in motion tends to stay in motion and an object at rest stays at rest unless acted upon by an outside force. Signup and view all the answers

What is Newton's 2nd law?

The relationship among an object's mass (m), acceleration (a), and an applied force (F) is Force equals mass times acceleration (F = ma). Signup and view all the answers

What is Newton's 3rd law?

For every action there is an equal and opposite reaction. Signup and view all the answers

What is inertia?

The property of matter that resists changes in motion. Signup and view all the answers

What is the formula for weight?

W = mg Signup and view all the answers

What is the formula for force?

F = ma Signup and view all the answers

What is the formula for mass?

M = D x V Signup and view all the answers

What is the formula for gravity?

gravity = mass/distance^2 (g = m/d^2) Signup and view all the answers

F = ma represents Newton's second law of motion.

True Signup and view all the answers

The force of gravity acting upon an object is the object's mass.

False Signup and view all the answers

To every action force, there's an equal and opposite reaction force is the law of conservation of momentum.

False Signup and view all the answers

Air resistance acts in the opposite direction to that of an object in motion.

True Signup and view all the answers

Study Notes

Force and Its Units

Force is defined as a push or pull acting on an object.
The SI unit for force is newton (N), equivalent to kg x m/s².

Effects of Forces

Unbalanced force results in acceleration of the object.
Balanced forces acting in opposite directions maintain the object's state, resulting in no motion.
A net force of zero on an object also leads to no motion.

Types of Friction

Static Friction: Acts on stationary objects, opposing the applied force.
Sliding Friction: Resists the motion of objects sliding over a surface and is less than static friction.

Fundamental Forces

Gravitational Force: The weakest universal force, attracts any two masses.
Electromagnetic Force: Involves charged particles; like charges repel and opposite charges attract.
Nuclear Force: The strong force that holds protons and neutrons together in the nucleus.

Newton's Laws of Motion

1st Law (Law of Inertia): An object stays in its state of rest or motion unless influenced by an external force.
2nd Law: Force (F) is the product of mass (m) and acceleration (a) represented as F = ma.
3rd Law: For every action, there is an equal and opposite reaction.

Inertia

Inertia is the resistance of matter to changes in its motion.

Key Formulas

Weight: W = mg (weight is mass multiplied by gravitational acceleration).
Force: F = ma (force equals mass times acceleration).
Mass: M = DxV (mass is density multiplied by volume).
Gravity: g = m/d² (gravity is mass divided by distance squared).

True/False Statements

F = ma accurately represents Newton's second law of motion. (True)
The object's mass is not the same as the force of gravity acting on it; it is its weight. (False)
The statement about action and reaction forces describes Newton's 3rd Law, not the law of conservation of momentum. (False)
Air resistance acts in opposition to the motion of an object. (True)

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Description

Test your knowledge of basic physics concepts with these flashcards focused on Unit 3. Explore the definitions of force, its SI unit, and the effects of balanced and unbalanced forces on objects. Perfect for quick revision or learning key terms.