Objective • SWBAT describe Newton’s second law of motion and use it to explain the movement of objects.

Chart of the Day

Review: Vocabulary • Force: a push or a pull • Net force: the sum of all forces acting on an object. • Balanced forces: forces that cancel each other out objects do not accelerate • Unbalanced forces: forces that do not cancel each other out object accelerates

Review: Newton’s First Law of Motion • An object at rest will remain at rest unless acted upon by an outside force. • An object in motion will remain moving at the same speed unless acted upon by an outside force.

How it relates to velocity-time graphs…

Newton’s Second Law of Motion • When a force acts on an object, the object accelerates in the direction of the force.

Newton’s Second Law of Motion (cont. )

Check For Understanding • A box with a mass of 20 kg is pushed with an acceleration of 2 m/s 2. The force acting on the box is… A. 5 N B. 10 N C. 20 N D. 40 N

Check For Understanding • An object with a mass of 30 kg is moving at a constant speed of 10 m/s. What force is pushing the object? – v = constant at 10 m/s acceleration = 0 m/s 2 – m = 30 kg

Check For Understanding • What will be the acceleration of an 8 kg object when it is pushed with a force of 16 N? A. 0. 5 m/s 2 B. 128 m/s 2 C. 2 m/s 2 D. 4 m/s 2