8th Grade Forces & Motion

Front

What is the force that pulls objects toward the Earth?

Back

Gravity is the force that pulls objects toward the Earth.

Front

What is friction?

Back

Friction is a force that opposes the motion of an object when it is in contact with another surface.

Front

What is inertia?

Back

Inertia is the tendency of an object to resist changes in its state of motion. The more mass an object has, the more inertia it has.

Front

How does mass affect inertia?

Back

An object with more mass has more inertia, making it harder to change its motion.

Front

What factors affect the amount of friction between two surfaces?

Back

The amount of friction depends on the weight of the objects pressing together and the roughness of the surfaces.

Front

What happens to friction on rough surfaces?

Back

Rougher surfaces have greater friction compared to smoother surfaces.

Front

What is the relationship between mass and gravitational force?

Back

The gravitational force between two objects increases with the mass of the objects.

Front

What is the formula for calculating weight?

Back

Weight = mass × gravitational acceleration (W = m × g).

Front

What is gravitational acceleration on Earth?

Back

Gravitational acceleration on Earth is approximately 9.8 m/s².

Front

What is the difference between static and kinetic friction?

Back

Static friction prevents motion between two surfaces at rest, while kinetic friction acts on surfaces that are sliding past each other.