Linear motion Flashcards
Define scalar quantity
When measurements only determined in terms of magnitude
Define vector quantity
When measurements described in magnitude and direction
What are the scalar measuremnts?
Mass, distance, speed
What are the vector measurements?
Weight, acceleration, displacement, velocity, momentum
Define mass
The quantity of matter the body possesses
Define weight
The force on a given mass due to gravity
Define distance
The path a body takes as it moves from start to finish position
Define displacement
Shortest route in a straight line between start and finish position
Define speed
The rate of change of distance
Define velocity
The rate of change of displacement
Equation for speed
Speed (M/S) = Distance (M) / Time taken(s)
Equation for velocity
Velocity (M/S) = Displacement (M) / Time taken (S)
Define acceleration
The rate of change of velocity
Equation for acceleration
Acceleration (m/s^2) = (Final velocity-initial velocity)/ Time (s)
Define momentum
The product of mass and velocity of an object in kgm/s
What are the 2 types of force
Internal
External
Define external force
Comes from outside the body
Define internal force
Generated by skeletal muscles
What are the vertical forces?
Weight
Reaction force
What are Newtons 3 laws of motion
1)Law of inertia
2)Law of acceleration
3)Law of Reaction
What is the law of inertia?
An object will remain stationary or in constant motion in a straight line unless another force is exerted on it
What is the law of acceleration?
Acceleration of an object is directly proportional to the force exerted on it and inversely proportional to its mass
What is the law of reaction?
When 2 objects interact, they exert equal and opposite forces on each other
Define reaction force
Occurs when 2 bodies are in contact with each other
