8th grade science: Force and Motion

Front

What happens to an object in motion if no unbalanced force acts on it?

Back

It continues moving in a straight line at constant speed.

Front

Inertia is the tendency of an object to ___________.

Back

Resist changes in motion.

Front

Why do you lurch forward in a car when it suddenly stops?

Back

Because your inertia keeps you moving.

Front

What is the definition of force?

Back

A push or pull on an object that can cause it to accelerate.

Front

What is Newton's First Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an unbalanced force.

Front

What is the unit of force?

Back

Newton (N).

Front

What is the relationship between mass and inertia?

Back

The greater the mass of an object, the greater its inertia.

Front

What is acceleration?

Back

The rate of change of velocity of an object.

Front

What is the formula for calculating force?

Back

Force = mass × acceleration (F = ma).

Front

What is the effect of a stronger force on an object?

Back

It causes a greater acceleration of the object.