8th Grade Science STAAR Physics

Front

What is inertia?

Back

Inertia is the tendency of an object to resist a change in its state of motion. It means that an object at rest stays at rest, and an object in motion continues in motion unless acted upon by an external force.

Front

What does Newton's first law of motion state?

Back

Newton's first law states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity unless acted upon by a net external force.

Front

What is Newton's second law of motion?

Back

Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This is often expressed with the formula F=ma (Force = mass x acceleration).

Front

What is the formula for calculating force?

Back

The formula for calculating force is F = ma, where F is force, m is mass, and a is acceleration.

Front

What is gravity?

Back

Gravity is a force that attracts two bodies toward each other. The strength of this force depends on the masses of the objects and the distance between them.

Front

What is the relationship between mass and acceleration?

Back

According to Newton's second law, more mass means less acceleration for the same amount of force applied. This means that heavier objects require more force to accelerate.

Front

What is the concept of action and reaction?

Back

According to Newton's third law, for every action, there is an equal and opposite reaction. This means that forces always occur in pairs.

Front

What is an example of inertia in everyday life?

Back

An example of inertia is when a car suddenly stops, and passengers lurch forward due to their bodies' inertia, wanting to continue moving in the same direction.

Front

What is the effect of friction on motion?

Back

Friction is a force that opposes motion between two surfaces in contact. It can slow down or stop moving objects.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.