2 Force Dynamics Intro

Front

What happens to a spacecraft when its rocket engines are turned off?

Back

It will cruise with constant velocity through space.

Front

What force must be applied to maintain the motion of a starship moving in a straight line at constant speed in empty space?

Back

Zero.

Front

What causes a person to fall forward in a moving bus when they are blindfolded?

Back

No force caused you to move forward, just your motion.

Front

What is inertia?

Back

The resistance of an object to change its motion.

Front

What can be inferred if you fall forward in a moving bus?

Back

The bus decreased velocity.

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 a net external force.

Front

Define force in the context of motion.

Back

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

Front

What is the relationship between mass and inertia?

Back

Inertia is directly proportional to mass; more mass means more inertia.

Front

What is the effect of gravity on a spacecraft far from any celestial body?

Back

Gravity has negligible effect, allowing the spacecraft to maintain constant velocity.

Front

What is the concept of constant velocity?

Back

Constant velocity means an object is moving at the same speed and in the same direction.