p4 Flashcards
What is Newtons third law?
Newton’s third law is: When two objects interact, the forces they exert on each other are equal and opposite.
What is a force?
A force is a push on an object that is caused by it interacting with another object.
What is a gravitational force?
A gravitational force is the attractive forces between the Earth and the Sun.
What is electrostatic forces?
The attraction or repulsion of charges when their electric fields interact.
What is magnetic forces?
The attraction or repulsion between two magnets due to their magnetic fields
What is the definition of an interaction pair?
An interaction pair is whenever two objects both feel a force of some kind, either a push or a pull.
What is mass?
Mass is measured in kilograms and is just the amount of matter in an object.
What is weight?
Weight is a downwards force between an object and the Earth, it is a gravitational attraction.
Weight(N)=
Mass(kg) x gravitational field strength(N/kg)
What are scalar quantities?
Examples of scalar quantities are: speed, distance, time- they simply tell you the “size” of the thing you’re measuring nothing else.
What are vector quantities?
Examples of Vector quantities are velocity, displacement, acceleration- vector quantities tell you both the size of the thing and its direction.
What is the difference between speed and velocity?
The difference between speed and velocity is that speed only states how fast something is but velocity states both how fast something is and the direction it is going in.
What is displacement?
Displacement is a vector quantity, it measures the net distance and direction in a straight line from an objects starting point to an objects finishing point.
Is distance a scalar or vector quantity?
Distance is a scalar quantity because it doesn’t state the direction in which the object is moving.
What is the equation of average speed?
Average speed= distance/time
What is the average wind speed?
The average wind speed is 7m/s.
What is acceleration measured in?
Acceleration is measured in metres per second squared.
What is the equation for acceleration?
change in speed / time taken
What is the definition of acceleration?
Acceleration is the change in velocity of an object in a certain amount of time.
What do distance time graphs tell you?
Distance time graphs tell you how far something has travelled.
What do the flat sections on a distance time graph show?
The flat sections on a distance time graph shows that the object isn’t moving.
What do curved sections on a distance time graph show?
The curved sections on a distance time graph show that there is acceleration.
What does a levelling off curve on a distance time graph show?
A levelling off curve on a distance time graph shows that the object is slowing down.