aim of physics
to understand the physical laws and principles that influence every aspect of daily life
displacement of an object
the distance that an object is from some starting point, and is measured in units
...
aim of physics
to understand the physical laws and principles that influence every aspect of daily life
displacement of an object
the distance that an object is from some starting point, and is measured in units of length
How does displacement change when an object is in motion?
it is constantly changing
How is motion described?
by displacement, velocity (speed) and acceleration
speed
distance traveled by an object per unit of time
speed = (distance traveled/time)
velocity
speed in a given direction
What two things does velocity tell us about a moving object?
its speed and direction
acceleration
the rate of change in velocity; can be any change in velocity, either positive or negative.
deceleration
negative acceleration or a decrease in velocity and can change in direction
How is acceleration calculated?
(final velocity-original velocity)/time
Why can velocity and acceleration be described using vectors?
because they have both magnitude and direction
What quality do all moving objects have?
momentum; an object traveling at a specific velocity has momentum
calculate momentum
Momentum = mass x velocity
conservation of momentum
the total movement of an isolated system is always constant, ie during a collision, the momentum of each body changes but the total momentum is conserved. One object may lose momentum, but this momentum is gained by other object
How is momentum conserved when a moving object hits a stable object, such as a bullet hitting a wall?
the moving object, like the bullet, delivers an impulse to the wall, and this impulse is said to be the change in the objects momentum
Newton's first law
objects in motion tend to stay in motion and objects at rest tend to stay at rest
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