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# Physics Chapter 4.

### Chapter 4 End Quarter Test Study Guide Grade 9.

Newton's 1st Law: An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced, external force.
Newton's 2nd Law: If a body is acted upon by an external force, it will accelerate in the direction of the unbalanced force with an accelerated proportional to the force.
Equilibrium: When net force equals zero, an object remains in the same motion (no acceleration)
Net Force: Sum of all the forces acting upon an object.
Apparent Weight: How heavy an object feels, force pushing up on an object by the floor.
Centripetal Force: A force directed towards the center that causes an object to follow a circular path.
Centripetal Acceleration: Occurs due to velocity direction change.
Radius: Distance from center of a circle to the outer edge.
Normal Force: Force from the surface of an object; contact force that makes 90 degree angle with surface edge.
Work: The product of the displacement and force in the direction of the displacement; scalar quantity.
Power: The time rate at which work is done and energy is transformed.
Dot Product: Can only multiply two vectors that are in the same direction.
Created by: Tierney