Newton’s Laws of Motion

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Presentation transcript:

Newton’s Laws of Motion

Forces What is a force? A push or a pull

Forces What are some of the forces that connect to motion? Contact force- when one object pushes or pulls on another by touching it. Gravity- the force of attraction between two objects. Friction- a force that resists motion between two surfaces that are pressed together.

Forces Force is a vector. This mean force has both size and direction.

Forces Balanced Forces (does not change motion) Same size- Opposite direction Unbalanced Forces (can change motion) Same size- Same direction Different size- Same direction Different size- Opposite direction

Sir Isaac Newton In the mid-1600s, the English scientist Sir Isaac Newton studied the effects of forces on objects. He formulated three Laws of Motion.

Newton’s 1st Law Objects at rest remain at rest, and objects in motion remain in motion with the same velocity, unless acted upon by an unbalanced force.

Newton’s 1st Law Inertia- Inertia is the resistance of an object to a change in the speed or the direction of its motion.

Newton’s 2nd Law The acceleration of an object increases with increased force and decreases with increased mass. (Force = mass x acceleration)

Newton’s 2nd Law Sample Problem #1 What force is needed to accelerate a 10kg shopping cart 3m/s? Answer Formula: F = ma Substitute: F = (10kg)(3m/s) Solve: F = 30 kg*m/s Answer: F = 30 Newtons or 30N

Newton’s 3rd Law Every time one object exerts a force on another object, the second object exerts a force that is equal in size and opposite in direction back on the first object.

Which law says that force is equal to mass times acceleration (F=MA)? Quiz Time Which law says that force is equal to mass times acceleration (F=MA)?

Quiz Time 2nd Law

Who was the scientist who gave us the Laws of Motion? Quiz Time Who was the scientist who gave us the Laws of Motion?

Quiz Time Newton

Quiz Time Which law says that heavier objects require more force than lighter objects to move or accelerate them?

Quiz Time 2nd Law

Quiz Time Which law says that for every action there is an equal and opposite reaction?

Quiz Time 3rd Law

How many Laws of Motion are there? Quiz Time How many Laws of Motion are there?

Quiz Time 3

What is another name for the first law of motion? Quiz Time What is another name for the first law of motion?

Quiz Time Law of Inertia

Which law explains why we need to wear seatbelts? Quiz Time Which law explains why we need to wear seatbelts?

Quiz Time 1st Law

Which law explains how rockets are launched into space? Quiz Time Which law explains how rockets are launched into space?

Quiz Time 3rd Law