Physics mid topic yr 10
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Define motion
Motion is the change in an objects position with time
Define average speed
average speed is the total distance covered divided by the total time taken
Define instantaneous speed
instantaneous speed is the speed at an instant point of the journey.
Define a scalar quantity with some examples
A scalar quantity are physical quantities that only have magnitude but no direction. This includes energy, mass, temperature and pressure.
Define a vector quantity with some examples
A Vector quantity are physical quantities that have both direction and magnitude. This includes displacement, direction, velocity, drag and momentum.
Define inertia
Define inertia as an object’s resistance to a change in its motion, an object with a greater mass will have greater inertia
Define displacement
Displacement refers to the shortest distance travelled by an object from its initial to its final position.
Define average velocity
average velocity is the total displacement divided by the total time taken
Define instantaneous velocity
instantaneous velocity is the displacement at an instant point of the journey.
Define acceleration
Define acceleration as a change in velocity with time (or rate of change of velocity).
What is a force
a force is a push or a pull that changes an object’s motion or its shape
Describe net force
Describe net force as the sum of the forces acting on an object
Define the first law of motion
Newton’s first law of motions states that an object will stay in motion unless an external force acts upon it.
Define the second law of motion
Newton’s second law of motion states that “The acceleration of an object is directly related to the magnitude and direction of the force acting on the object, and inversely related to the mass of the object: F=MA.”(Mass if direclty proportional to its acceleration while inversely proportional to its mass) This means heavy object (with a lot of mass) needs a great force to start moving than a lighter object.
Define weight
Weight is a measure of the gravitational force acting on an object. It is measured in N (newtons), Fweight=mg
Define the third law of motion
The third law of motion states that every action has a equal and opposite reaction.
Define energy
Energy is the ability to do work
Define work
Measure of the amount of energy required to move an object Define work also as a force applied over a distance
Define the law of conservation of energy
The law of conservation states that energy cannot be created or destroyed.