Deck 11- Chapter 9 Flashcards
What is uniform acceleration?
A uniformly accelerating object adds the same amount to its velocity in each short time interval.
How can you calculate acceleration from a speed vs time graph?
Do speed divided by time.
For a constant acceleration what does a speed-time graph appear like?
It appears like a straight line.
What can be calculated from a distance/time graph?
The speed.
Why are graphs used to plot motion?
Graphs help us picture motion, there are useful when the movement of motion is uneven or complicated.
What does the area below a speed/time graph give you?
The area below a speed/time graph is displacement.
What is the gradient of a speed/time graph?
Acceleration
Explain the two components and their relationship when a ball is thrown.
Vertical and horizontal components of velocity are independent; the vertical component increases uniformly with time ; the horizontal components is constant ( in an ideal world of no air resistance).
Why when a ball is thrown horizontally that the horizontal vector is not affected by the vertical vector?
Vectors perpendicular to each other don’t affect on another.
Is mass a scalar or vector?
Scalar
Is force a vector or scalar?
Vector
Is acceleration a scalar or vector?
Vector
Why do top-class sprinters need to be large and tall?
1) Longer legs mean more efficient use of muscles(using bones as levers)2) Less energy loss because feet don’t hit the ground so often.3) Each stride covers more ground.
How can gravitational field strength be measured?
The gravitational field strength can be measured by acceleration of free fall.
What is one newton equal to?
N = Kg m s^-2
