Physics 1st Semester Review 1 of 2

Front

What is Newton's 1st Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a net external force.

Front

What is Newton's 2nd Law of Motion?

Back

The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F = ma).

Front

What is Newton's 3rd Law of Motion?

Back

For every action, there is an equal and opposite reaction.

Front

What does a velocity-time graph represent?

Back

It shows how the velocity of an object changes over time.

Front

How can you identify an object changing direction on a velocity-time graph?

Back

Look for points where the graph crosses the time axis (velocity = 0) or where the slope changes sign.

Front

What is frictional force?

Back

The force that opposes the relative motion of two surfaces in contact.

Front

What is normal force?

Back

The force exerted by a surface to support the weight of an object resting on it, acting perpendicular to the surface.

Front

What is gravitational force?

Back

The attractive force between two masses, proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Front

What is applied force?

Back

A force that is applied to an object by a person or another object.

Front

How do you determine which segment shows faster speed on a distance-time graph?

Back

The segment with the steeper slope represents a faster speed.