Dynamics Flashcards
What is Speed?
Speed is a measure of how far an object travels each second.
What is Average Speed?
Average speed is the total distance travelled by an object measured over the total
time taken.
What is Instantaneous Speed?
Instantaneous speed is the speed of an object at a particular moment in time.
What is Acceleration?
Acceleration is the change in speed per unit time.
What do Speed-Time Graphs do?
Speed-time graphs can be used to represent the motion of objects travelling in straight
lines.
What Type of Line Represents Constant Speed on a Speed-Time Graph?
A horizontal line
What is Deceleration?
Deceleration is a negative acceleration
What is a Force?
A force is an interaction between two objects.
What is Force Measured in?
Newtons (N)
What Instrument is used to measure forces?
A newton balance
What 3 things can a Force do to an Object?
- Change the Shape
- Change the Speed
- Change the Direction
What is Friction?
Friction is a force which opposes the motion of an object.
What is Air Resistance?
Air resistance (also known as drag) is a type of frictional force caused by air particles coming into contact with an object.
When do Balanced Forces Occur?
Balanced forces occur when the forces acting on an object are equal in magnitude
but opposite in direction.
When do Unbalanced Forces Occur?
Unbalanced forces occur when the forces acting on an object are different in magnitude but opposite in direction
