CP1-2 Flashcards
(27 cards)
What is a vector quantity?
A quantity with both size and direction e.g Force, velocity
What is a scalar quantity?
A quantity that does not have a direction e.g distance, speed
What is the equation used to calculate speed?
Speed = distance ÷ time
What does a horizontal line on a distance/time graph mean?
The object is stationary
What does a straight, sloping line on a distance-time graph mean?
The object is moving at a constant speed
What does the gradient of the line on a distance-time graph tell us?
The speed the object is travelling
What is the equation used to calculate acceleration?
Acceleration = change in velocity ÷ time taken
Which equation links acceleration, initial velocity, final velocity and distance travelled?
(final velocity)^2 - (initial velocity)^2 = 2 x acceleration x distance
Which value is known as the acceleration due to gravity?
10 m/s^2
What does the horizontal line show on a velocity-time graph?
The object is moving at constant velocity
What does a sloping line show on a velocity/time graph?
The object is accelerating
What does a line below the horizontal axis on a velocity/time graph show?
The object is moving in the opposite direction
What does the area under a velocity/time graph represent?
The distance the object has travelled
What is Newton’s first law of motion?
A moving object will continue to move at the same speed in the same direction unless an external force acts on it and a stationary object will remain at rest unless an external force acts on it
What is mass?
The quantity of matter there is in an object
What is weight?
A measure of the pull of gravity on an object (depends on the strength of gravity)
What is the equation used to calculate weight?
Weight = mass x gravitational field strength
What is Newton’s second law of motion?
Acceleration in the direction of a resultant force depends on the size of the force and the mass of the object
What is the equation used to calculate force?
Force = mass x acceleration
What is the definition of inertial mass?
The force on it divided by the acceleration that force produces
What is the difference between action-reaction forces and balanced forces?
Action-reaction forces act on different objects
Why don’t action-reaction forces that occur during a collision always have the same effects on the two objects?
The objects might have different masses
What is momentum?
The tendency of an object to keep moving, or how hard it is to stop it moving
What is the equation used to calculate momentum?
Momentum = mass x velocity
