Sci 7 Newton's First Law of Motion

What does Newton's first law of motion describe?

• The principle of inertia

• The principle of gravity

• The principle of acceleration

• The principle of energy conservation

According to Newton's first law, what happens to an object at rest?

• It will change direction

• It will remain at rest

• It will start moving on its own

• It will accelerate

What is required for an object in motion to change its speed or direction?

• A balanced force

• An internal force

• An external force

• No force

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

• It will continue in motion with the same speed and direction

• It will change direction

• It will stop

• It will accelerate

What is an example of Newton's first law in space?

• A soccer ball being kicked

• A car accelerating

• A tool floating and continuing to move at a constant speed and direction

• A plane taking off

Which of the following best illustrates the concept of inertia?

• A car speeding up on a highway

• A book remaining on a table until someone moves it

• A ball rolling down a hill

• A bird flying in the sky

What is necessary for an object at rest to begin moving?

• A decrease in friction

• An unbalanced force

• An increase in temperature

• A change in its mass

How does Newton's first law apply to a spacecraft traveling in the vacuum of space?

• It will change direction randomly

• It will accelerate indefinitely

• It will continue moving at a constant velocity unless acted upon by an external force

• It will eventually stop due to lack of fuel