Inertia describes which of the following?
1. how long an object is
2. how large an object is
3. how difficult it is to change an object's motion
4. how fast an object is moving

What is friction? how does it affect the motion of an object?

An electron moving at 5.06 103 m/s in a 1.23 t magnetic field experiences a magnetic force of 1.40 10-16 n. what angle does the velocity of the electron make with the magnetic field? there are two answers between 0° and 180°. (enter your answers from smallest to largest.)

How do cracks affect the rate of weathering?