Section A Forces And Motion Flashcards
(28 cards)
What is the equation linking velocity, distance and time?
Velocity= distance/time
What is the equation linking acceleration, velocity and time?
Acceleration= (final velocity- initial velocity)/ time taken
What does deceleration mean?
Slowing down
What does it mean when in an acceleration graph, the line is horizontal?
The object has stopped moving.
What does it mean in a velocity graph, when the line is horizontal?
The object is at steady speed.
How do you calculate the gradient?
Gradient = vertical/horizontal
What is the equation linking speed distance and time?
Speed= distance/time
What is instantaneous speed?
The speed any given instance within that span of time.
What is speed?
A scalar quantity; distance travelled divided by time without regard to direction.
What is velocity?
A vector quantity, meaning it’s speed in a specified direction.
How do you calculate the acceleration?
Acceleration = Gradient = Vertical/Horizontal
What is an unbalanced force?
A force that is not balanced by a force in the opposite direction.
What is the equation linking force, mass and acceleration?
F = m x a a = F / m m = F / a
What is the acceleration on Earth?
10 m/s2
What is the acceleration on the Moon?
1.6 m/s2
What is the unit for measuring acceleration?
m/s2
Meters per second(s) squared
What is the equation linking momentum, mass and velocity?
momentum (kg m/s) = mass (kg) x velocity(m/s)
p = m x v
What are the units for momentum?
kg m/s
What number do you have to divide by to turn km/h to m/s?
3.6
What is an elastic collision?
In an elastic collision, the total kinetic energy of the colliding bodies is conserved, i.e. unchanged by the collision.
An example of an elastic collision?
Gas particles
What is a partial elastic collision?
When the object colliding with another but then reverts to its original shape, but loses energy from the collision.
An example for a partial collision?
A ball bouncing off a wall.
What is an inelastic collision?
When two object stick together and maintain the shape the force has put upon it.
