# Physics- Topic 1

• Created by: Bethx1807
• Created on: 03-03-15 17:54
• Speed is a measure of how far something travels is a certain amount of time.
• Speed and Velocity
• Speed= Distance/ Time
• Speed and Velocity
• The units depend on how you measure the distance and time.
• Speed= Distance/ Time
• Velocity is a vector quantity.
• Scalors and Vectors
• Physics
• Force and Acceleration
• Acceleration= Change in Velocity/ Time Taken
• The size of the acceleration depends on the 'resultant' forces acting on an object and the mass of the object.
• The displacement is a vector quantity which shows how far the object is from its initial position.
• When an object moves the distance is scalor measure of how far the object moved.
• Scalors and Vectors
• Physics
• Force and Acceleration
• Acceleration= Change in Velocity/ Time Taken
• The size of the acceleration depends on the 'resultant' forces acting on an object and the mass of the object.
• The displacement is a vector quantity which shows how far the object is from its initial position.
• Acceleration
• Acceleration is a measure of how fast something can change its speed.
• Gravity causes objects to accelerate as they fall.
• Acceleration is a measure of how fast something can change its speed.
• Motion Graphs
• Motion graphs tell us a 'story' about how an object has moved.
• Motion Graphs
• It does this by showing how distance, speed, displacement etc. vary within time.
• When familiar you can quickly get info at a given time.
• You can also find the displacement when measuring the area under a velocity time graph.
• Motion graphs tell us a 'story' about how an object has moved.
• It does this by showing how distance, speed, displacement etc. vary within time.
• When familiar you can quickly get info at a given time.
• If the graph is not uniform, you can split the area into sections.
• Netwon's Laws
• Law 1: Any object will keep the same velocity unless there are unbalanced forces acting on it.
• Law 2: If unbalanced forces are acting on an object it will   accelerate.     F = M A
• Every forces has an equal and opposite force.
• Stopping Distances
• Braking Distance= The distance a car will travel whilst the brakes are engaged and the car comes to a halt.
• When a car needs to brake, then the distance it will travel is made up of two separate sections.
• Stopping Distances
• When a car needs to brake, then the distance it will travel is made up of two separate sections.
• STOPPING DISTANCE= THINKING DISTANCE + BRAKING DISTANCE