Laws of Motion

Question 1

Newton’s

First Law

of Motion

Answer 1

Velocity only changes when a force acts on an object.

Question 2

Newton’s 2nd

Law of Motion

Answer 2

Mass is resistance to acceleration.

This is a vector equation.

Question 3

Newton’s 3rd

Law of Motion

Answer 3

For every force applied there is a force applied equal in magnitude and opposite in direction.

Question 4

Static friction

Answer 4

Question 5

Kinetic Friction

Answer 5

Question 6

Simple Physics Ideas for Dynamics

Answer 6

1. FBD shows forces and coordinates.
2. Motion sketch shows accelerations & velocities.
3. Positive x-axis is in direction of acceleration.
4. Friction opposed motion or impending motion.
5. Sum force components in x direction and sum force components in y directon using the 2nd law.