P8 Flashcards
What are examples of scalar quantities
Mass
Temperature
Speed
Distance
Time
What is a scalar quantitie
Scalar quantities have only magnitude (size) and no direction
What are examples of vector quantities
Displacement
Weight
Force
Acceleration
Velocity
What are vector quantities
Vector quantities have both magnitude and direction
How do we represent vector quantities
Using an arrow
The length represents the magnitude Of the vector
The direction represents the direction of the vector
What is a force
It’s the pushing or pulling of an object with another object
All forces have both magnitude and direction so it’s a vector quantities
What is a contact force what are some examples
The two objects are physically touching such as friction , air resistance
What’s a normal contact force
Such as a downward force of a lamp on an upward force of a table which is normal. This can only happen when two objects are in direct contact
What are non-contact forces
The two objects are physically separated such as gravitational force , electrostatic force , magnetic force
What is Newton’s third law of motion
Two objects interact with each other , they exert equal an opposite forces on each other
What’s the relationship between mass and weight
Directly proportional
What is the centre of mass
This is the point of an object where it’s mass can be thought of as being concentrated
How do you work out the resultant force
You minute the larger force by the smaller force
Parallelogram of forces
Use the magnitude and create two lines with the angle in between. Then carry on this line and create the angle at the point at the end of both lines until they meet again. Measure the point to point which is the resultant force.
Resolving force
Right angle with a diagonal in the middle
Work is what
This is a measure of energy transfer so the unit of work is the joule
When a force of 1N moves an object by 1m then 1J of work is done
What’s Newton’s first law
If a resultant force acting on a stationary object is 0 then it will remain stationary
Of a resultant force acting on a moving object is 0, then the object will continue to move in the same direction at the same speed (with the same velocity)
What’s Newton’s second law
The acceleration of an object is proportional to the resultant force acting on an object hit its inversely proportional to the mass of the object
What is equilibrium
The resultant force is 0
The force acting on the object has no overall effect
If the lines of action. If the forces add parallel the sun if the forces in one direction must be equal to the sum of the forces in the opposite direction. This means that the resultant force in the object is 0
