FORCES Newtons Laws Free Body Diagrams Friction Torque

FORCES Newton’s Laws Free Body Diagrams Friction Torque

A Force is defined as a push or a pull. If an unbalanced force acts on an object, it will cause an object to move. Forces are: • Vectors • Measured in Newton's (N)

Newton’s 3 laws of Motion Newton’s 1 st Law of Motion Newton’s 2 nd Law of Motion Newton’s 3 rd Law of Motion

Newtons 3 Laws of Motion 1 st Law: Objects in motion (or at rest) will stay in motion (or at rest) unless acted on by an unbalanced force. 2 nd Law: Force equals mass times acceleration. Objects will accelerate in the direction of the Net Force. 3 rd Law: For every action there is an equal but opposite reaction

Inertia Newtons 1 st Law Inertia is the unwillingness to change! nertia is the resistance of an object to accelerate. (speed up, slow down, or change directions).

Newtons 2 nd Law Force is a vector (Direction Matters)

When solving for Force: If you are solving for MASS If you are solving for ACCELERATION m= F a a= F m

Acceleration and Force a = 5 m/s 2 F = 50 N F = 25 N 5 kg F = 25 N 10 kg F = 50 N The Net Force (Total Force) will be in the same direction as the acceleration!

Newtons 3 rd Law Forces exists in pairs

NET FORCES Fnet = ma

Net Force – The Overall Force on an object The Net Force is the sum of all forces on an object. Since Force is a VECTOR, the direction of the force matters! 15 N Right 5 N Left Net Force = 10 N Right Note: The length of the vector should reflect the MAGNITUDE. Note: If more than one vector is acting in the same direction, add them before calculating the net force. 10 N Left 20 N Left 10 N Right 30 N Right 40 N Right Net Force = 20 N Right

Net Force Dice Activity! You will be working with a partner – I get to choose!

5 N a=F/m 2 kg 12 N a=7/2 7 N, L 2 kg a = 3. 5 m/s 2