Section 1Forces SPS8.b Apply three Newton’s Laws to everyday situations by explaining the following:

Section 1Forces Inertia Relationship between force, mass and acceleration Equal and opposite forces

Section 1Forces EQ: How do Newton’s Laws of motion explain motion?

Section 1Forces Newton’s First Law What makes an object speed up, slow down, or change directions?

Section 1Forces Newton’s First Law Newton’s first law states that objects change their state of motion only when a net force is applied.

Section 1Forces Newton’s First Law, continued Objects tend to maintain their state of motion. An object in motion tends to stay in motion, an object at rest tends to stay at rest

Section 1Forces Newton’s First Law, continued The greater an object’s mass, the greater its inertia.

Section 1Forces Newton’s First Law, continued inertia: the tendency of an object to resist a change in motion unless an outside force acts on the object

Section 1Forces Newton’s First Law, continued Seat belts prevent inertia from smashing you into the dash and windshield in the sudden stop from a crash.

Section 1Forces Newton’s Second Law What determines how much an object speeds up or slows down?

Section 1Forces Newton’s Second Law Newton’s second law states that: net force = mass x acceleration.

Section 1Forces Newton’s Second Law The unbalanced force on an object determines how much an object speeds up or slows down.

Section 1Forces Newton’s Second Law net force = mass × acceleration or F = ma

Section 1Forces Newton’s Second Law Force is measured in newtons (N): 1 N = 1 kg × 1 m/s 2

Section 1Forces Newton’s Second Law, continued For equal forces, a larger mass accelerates less.

Section 1Forces Newton’s Second Law, continued For equal masses, a greater force produces a greater acceleration.