T3 L3&4 Newton's Laws and Friction

Front

What is static friction?

Back

Static friction is the force that keeps an object at rest on a surface. It acts to prevent the object from starting to move.

Front

When does static friction act on an object?

Back

Static friction acts on objects when they are resting on a surface.

Front

What type of friction is involved when a wheel rolls on a surface?

Back

Rolling friction is the type of friction involved when a wheel rolls on a surface.

Front

What is Newton's first law of motion?

Back

Newton's first law states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity unless acted upon by an external force.

Front

What is Newton's second law of motion?

Back

Newton's second law states that 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 third law of motion?

Back

Newton's third law states that for every action, there is an equal and opposite reaction.

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 mass of the object.

Front

Give an example of inertia.

Back

A book remaining at rest on a table is an example of inertia.

Front

What happens to a girl on a sled if no external forces act on her?

Back

The girl on the sled will remain in motion unless she is stopped by an outside force.

Front

What is sliding friction?

Back

Sliding friction is the force that opposes the motion of an object sliding over a surface.