Forces and Motion Flashcards
Newton’s third law
If object A exerts a force on object B then object B exerts an equal and opposite force on Object A.
equation linking average speed, distance moved and time taken.
s=d/t
equation linking weight, mass and gravitational field strength
w = m x g
what is the name of the force that pulls planes downwards towards the earth?
gravitational force
what is the difference between a scalar and a vector quantity?
a vector is a quantity with both direction and magnitude but scalar has just magnitude.
which of speed, time, mass and force is a vector quantity?
force
what is terminal velocity?
when something falls, the weight causes the object to speed up. resistance forces act upon the object and slow it down. eventually the forces balance out and the object reaches its terminal velocity
how do you find the gradient of a graph?
gradient = change in y/ change in x
how do you find the acceleration?
a = v-u/ t
Give examples of scalar quantities
Temperature, mass, energy, distance, speed and density
What is magnitude
The size of a physical quantity
Give examples of Vector quantities
force, displacement, velocity, weight, acceleration and momentum
How do you know whether a quantity is a vector
Its direction is known
What is Newton’s first law
An object remains in the same state of motion unless a resultant force acts on it. (if the resultant force is 0 an object remains stationary or continues at a constant speed)
Newton’s second law
An object accelerates in the direction of a resultant force (resultant force (N) = Mass (kg) x Acceleration (m/s^2))
