Kimberly Holloway Pocahontas Middle School Powhatan, Virginia

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Racing Into Motion. Kimberly Holloway Pocahontas Middle School Powhatan, Virginia. Frame of Reference.

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Presentation Transcript

Racing Into Motion

Kimberly Holloway

Pocahontas Middle School

Powhatan, Virginia

Frame of Reference

A frame of reference is the standard used for judging or deciding if motion has occurred in a situation. Motion can be determined by using the frame of reference to measure from point A to point B.

The most common frame of reference is the horizon.

Newton's Laws

• Law 1 : An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
• Law 2: The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.
• Law 3: "For every action, there is an equal and opposite reaction."

Formulas

Speed = Distance / Time

Acceleration = Force / Mass

Velocity = Change in Acceleration / time

Speed Problem

A tractor on the farm can cover 26 acres of field in 4 hours. What is the tractor’s speed?

Speed = Distance / Time

S = 26 acres / 4 hours

S = 6.5 acres/hour

If a vehicle with a mass of 1.6 kg is rolling with a force of 50 N, calculate the car’s rate of acceleration.

A = F / M

A = 50 N / 1.6 kg

A = 31.25 N / kg

Acceleration Problem

Velocity Problem

Karl was driving to work at a rate of 60 mph. He had to pull over to the side of the road when he discovered he had a flat tire. He did this quickly, in 10 seconds, for the traffic was terrible! What was the rate of Karl’s velocity?

V = (end – start) / time

V = (0 mph – 60 mph) / 10 sec

V = - 60 mph / 10 sec

V = - 6 mph / sec