Motion Flashcards
Name three vector quantities:
Velocity, weight, displacement, force, acceleration, momentum
Name three scalar quantities:
Speed, distance, mass, energy, temperature, time
What do speed and velocity measure?
What is the difference between them?
They both measure how fats you’re going, but speed is a scalar and velocity is a vector
What is the equation for distance travelled?
Distance travelled (m)= (average) speed (m/s) x time (s)
What is acceleration?
Acceleration is the rate of change of velocity
What is initial velocity?
It is the starting velocity of the object
What is the equation for acceleration?
Acceleration = change in velocity (v-u)/time
U=initial velocity
V=final velocity
How do you work out distance travelled on a Velocity/Time graph?
The area under any section of the graph is equal to the distance travelled in that time interval.
What is circular motion?
If an object is travelling in a circular orbit it is constantly changing direction, so it is constantly changing velocity, which means it is accelerating.
What is the force that keeps something moving in a circle?
The force is called a centripetal force.
The larger the resultant force…
…the more the object accelerates.
The larger the mass of an object…
…the lower the acceleration of the object.
What is the formula for Newton’s second law
Resultant force (N)= Mass (kg) x Acceleration (m/s2)
What does Newton’s first law state?
Until acted on by a resultant force, objects at rest stay at rest and objects moving at a constant velocity will stay moving at that velocity.
What does an objects inertial mass measure?
It measures how difficult it is to change the velocity of an object.
