Forces In Balance Revision Chapter 9-10 Flashcards
(20 cards)
What are vectors?
A vector quantity can be represented by an arrow in a vector length in proportion.
What are scalars?
A scalar quantity has magnitude but no direction.
What is displacement?
Displacement is distance in a given direction.
What is the forces between objects?
Forces can change the shape of an object or change its motion or its state of rest.
What is a contact force?
A contact force is a force that acts on objects only when the objects touch each other.
What is a resultant force?
The resultant force is a single force that had the same effect as all the forces acting on an object.
What is the moment of a force?
The moment of a force is a measure of the turning effect of the force on an object.
What is the equation of a moment force?
Moment of f= Fxd
What is a lever of a force?
Used as a force multiplier exerts a greater force than the force applied to the lever by effort.
What is a gear force?
Gears used to change the moment of a turning effect.
What is the centre of a mass?
The centre of mass of a symmetrical object is along the axis of symmetry.
What is the moments and equilibrium?
If an object at rest doesn’t turn, the sum of the anticlockwise moments about any point= the sum of the clockwise moments about that point.
What is motion?
The speed of an object is V=s
T
The distance time graph for any object that is stationary, is a horizontal line moving at constant speed.
What is velocity?
Velocity is speed in a given direction.
What is acceleration?
The acceleration of an object is a =v
T
What is deceleration?
Deceleration is the change of velocity per second when an object slows down.
What is the equation for velocity and acceleration?
A=v-u
T
What is a motion sensor?
Linked to a computer can be used to measure velocity changes.
What does a positive gradient represent?
A positive gradient on a velocity-time graph represents positive acceleration, a negative gradient represents deceleration.
Analysing motion graphs equation?
The gradient of the line= the height of the triangle
the base of the triangle
