Unit 5 Review (Newton's 1st Law)

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 with the same speed and in the same direction unless acted upon by a net external force.

Front

How does mass affect the pull of gravity on an object?

Back

The mass of an object is directly proportional to the gravitational force acting on it; greater mass results in a stronger gravitational pull.

Front

What is a net force?

Back

The net force is the vector sum of all the forces acting on an object, determining its acceleration.

Front

If no net force acts on an object, what will happen to its motion?

Back

The object will maintain its current state of motion, either remaining at rest or moving at a constant velocity.

Front

What happens to an object's motion when a net force is applied?

Back

The object may change its speed, change its direction, or both, depending on the direction and magnitude of the net force.

Front

In the example of a skateboarder rolling down a hill, what principle is illustrated?

Back

This illustrates Newton's First Law of Motion, where the skateboarder continues to roll until a force (like friction or a wall) stops them.

Front

What is the formula to calculate net force?

Back

Net force (F_net) = mass (m) x acceleration (a).

Front

If Lizzie pushes Alex on a scooter with 75 N to the left and Alex pushes with 20 N to the left, what is the net force?

Back

The net force is 95 N to the left.

Front

What is the effect of friction on an object's motion according to Newton's First Law?

Back

Friction is a force that opposes motion, and it can cause an object in motion to eventually come to a stop.

Front

What is inertia?

Back

Inertia is the tendency of an object to resist changes in its state of motion; it is directly related to the object's mass.