What are the two types of forces?

Contact forces and forces acting at a distance

Forces that occur when objects physically touch (e.g., friction, normal force)

Forces Acting at a Distance

Forces that can affect objects without physical contact (e.g., gravity, electrical force, magnetic force)

What are specific examples of forces?

Gravitational force, electrical force, magnetic force, friction

Newton's First Law of Motion

An object at rest stays at rest, and an object in motion stays in motion with the same speed and direction, unless acted upon by an unbalanced force.

Example of Newton's First Law

Imagine you're riding in a car and it suddenly stops. Your body continues moving forward because it wants to stay in motion. Seatbelts provide the force needed to stop our bodies along with the car.

The acceleration of an object depends on two things: the net force acting on the object and the object's mass. Expressed as: Force = Mass \times Acceleration (F = ma).

Example of Newton's Second Law

When you kick a soccer ball, you apply a force to it. The ball accelerates based on how hard you kick it (the force) and how heavy the ball is (its mass). A harder kick or a lighter ball results in greater acceleration.

- Forces have magnitude (strength) - Forces have direction - Multiple forces can act on an object simultaneously

What are the effects of forces on the motion of objects?

- Forces can cause objects to move, stop moving, or change direction - Forces can change an object's shape or size

When forces are balanced, an object remains at rest or moves at constant velocity.

What do unbalanced forces cause?

When forces are unbalanced, an object accelerates (changes velocity).

What is the relationship between net force and an object's acceleration?

The net force is directly proportional to the object's acceleration.

How does reducing friction affect the motion of an object?

The object will move more easily and may accelerate.

What is the relationship between an object's mass and its inertia?

Objects with greater mass have more inertia.

Applying an unbalanced force to an object at rest affects its motion by causing the object to begin to accelerate in the direction of the net force.

The object will begin to accelerate in the direction of the net force.

When does an object's motion remains constant (either at rest or moving at constant velocity)?

When the net force acting on an object is zero, the object's motion remains constant, either at rest or moving at constant velocity.

What is the effect of friction on an object sliding across a surface?

Friction acts as an unbalanced force that decreases the object's speed.

Effect of an unbalanced force acting perpendicular to an object's motion

The object's direction of motion changes, but its speed remains constant.

Friction as a contact force

Friction occurs when surfaces directly interact, like shoes on pavement.

Unbalanced forces on a toy car

Initially, the pushing force is greater than the friction force, causing acceleration. As speed increases, friction equals the pushing force, resulting in constant speed.

Unbalanced Forces Flashcards Flashcards

Student preview

29 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Newton

Back

The unit of measurement for force.

2.

FLASHCARD QUESTION

Front

Unbalanced Force

Back

When the net force on an object is NOT zero.

3.

FLASHCARD QUESTION

Front

Force

Back

Any push or pull.

4.

FLASHCARD QUESTION

Front

Free Body Diagram

Back

A tool used to show forces on an object which may or may not be affecting the object's motion.

5.

FLASHCARD QUESTION

Front

Inertia

Back

An object's resistance to change in motion.

6.

FLASHCARD QUESTION

Front

Net Force

Back

The overall force acting on an object.

7.

FLASHCARD QUESTION

Front

Friction

Back

A force that opposes motion between two surfaces in contact.

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