Describing Motion Flashcards
What is Physics?
Physics studies matter, motion, forces, and energy through space and time.
What is Distance?
Is how far an object travels in total
What is displacement?
Describes the net distance and direction travelled from start point to finish point
What are Scalars?
Are quantities that can be full described by their magnitude (size).
What are vectors?
Are quantities that have a direction as well as a magnitude.
Examples of Scalars
- Distance
- Mass
- Energy
- Speed
Examples of Vectors
- Acceleration
- Velocity
- Displacement
- Force
What is Average Speed?
The average speed of an object shows us how far an object moves in a certain time
What is Instantaneous Speed?
Would be the speed any given instant within that span of time, measured with a speedometer.
What is speed?
The rate the rate at which the distance of an object is changing
What is velocity?
Is the rate at which displacement of an object is changing. Velocity includes direction.
What is Acceleration?
Is the rate of change of velocity. It can be positive or neagative.
What can negative acceleration be?
Deceleration- slowing down
Speeding up in a negative direction- reversing
What are contact forces?
They are applied directly to the body through physical contact. When the contact ceases so does the force.
What are examples of contact forces?
hitting a ball, collision
What is a non- contact force?
It is applied without direct contact. The force never ceases to act upon the body, no matter how small the force is or becomes.
What are the effects of Forces?
- Change of object’s speed
- Change of object’s direction
-Change of object’s shape
What is a force?
Is a push or pull of an object. It is a vector quanitity.
What are examples of a non-contact force?
Magnetism, electrical forces
What is the net force?
It is a combined effect of all the forces acting on an object.
If the forces are in the same direction, magnitudes are added.
If they are in the opposite direction, magnitudes are subtracted.
What is a balanced force?
They are described as balanced when the net force is equal to 0N. The object will remain motionless or travel at a constant velocity.
What is an unbalanced force?
They are described as unbalanced when the net force is greater than zero in a given direction
What is Newton’s first Law?
Every object continues in a state of rest or constant velocity unless acted upon by an unbalanced force.
What is Inertia?
Without an unbalanced force acting on an object, they will continue to do what they are doing forever.
What is Newton’s second law?
The acceleration of an object is dependent upon two variables. - The size of an unbalanced force and the the mass of an object
What is Newton’s third law?
For every action, there is an equal and opposite reaction.
These forces must be:
Equal in magnitude
Opposite in direction
Be same nature (two push forces)
Act on different objects
