P8 Forces And Balance Key INFO Flashcards
What are vectors?
Physical quantities that have direction
What are scalars?
Physical quantities that have NO specific direction.
A Vector has _____ and ______
Magnitude and direction
A scalar has _____
Magnitude
What can vectors be presented by?
An arrow with a direction
What is Newton’s third law of motion?
When 2 objects interact with each other they exert equal and opposite force on each other.
What is a good example of Newton’s third law of motion with a boxer punching a bag with a force of 100 Newtons
The boxer will punch the bag at a force of 100 Newtons and receives 100 Newtons from the bag
What is displacement?
Distance in a given direction(basically the shortest, straightest route from A to B)
How do you know if an object has balanced forces?
- it remains Stationary
- travels at a constant speed
- the resultant force =0
What is equilibrium?
A state of balance
How do you known if an object is at equilibrium?
- it remains Stationary
- travels at a constant speed
- the resultant force =0
- no turning effect
What does a resolution of forces do?
Breaks down a force into a vertical and horizontal component.
What is the centre of mass?
Where the mass is most concentrated(usually at the objects midpoint)
What is the centre of mass on an object with more than 1 line of symmetry?
Where the lines of symmetry meet
What is the centre of mass of an object?
The point in which the mass is throught of to be the most concentrated
If you suspend an object and release it what will happen?
It will come to rest with its centre of mass directly BELOW the point os suspension
-the object is then in equilibrium (at a rest) so its weight does not exert a turning effect.
Because of this the objects centre of mass is directly below the point of suspension
What is suspension?
Suspension is defined as a time period during which something temporarily stops
In this case the objects equilibrium state
What happens when an object is freely suspended?
It returns to equilibrium
What does a parallelogram of forces do?
Created a magnatude(resultant force) from two seperate vectors with an angle
What does Newton’s first law of motion state?
If the forces acting on an object are balanced, the resulant force is 0 and the object is at a rest(stationary)
-if the object is moving it remains at a constant speed
