Motion Flashcards
(18 cards)
Define scalar
A quantity with only size or magnitude.
Define displacement.
The shortest touts between two points. Distance and direction are needed. It is a vector quantity.
Define vector.
A quantity with magnitude and direction.
Define Position.
Describes the location of something from a fixed point.
Define distance.
The distance between two points. No direction and it is scalar.
What is the difference between a distance time graph and a position time graph?
A distance time graph always has a positive gradient. It only goes up.
A position time graph can have a positive or negative gradient.
When can the SUVAT equations be used?
When acceleration is constant.
How is velocity shown on a position time graph?
It is the gradient.
How is average speed found?
Total distance travelled ÷ total time taken
How is average velocity found?
Displacement ÷ time taken.
How is velocity found at an instant?
Draw a tangent to the instant you want.
How is average acceleration found?
Change in velocity ÷ time.
What is the formula for the area of a trapizum?
(Top length + bottom length) divided by 2. Times by height.
How is acceleration found from a velocity time graph?
It is the gradient.
What are the rules for force diagrams?
Forces are arrows that are attached to the object. Acceleration is a double arrow parallel to the diagram.
Mass goes inside the object.
What is used to show the reaction force?
R is used. If resistance is also used in the same diagram, use R/N
What are the forces acting on a man parachuting?
Air resistance on the parachute, on the man, weight of the two and tension in the rope.
What is a force?
It is a vector. It has magnitude and direction.
