Chapter 2 Flashcards
To review everything from the book and first term with Ms NEale.
What is speed?
The rate of movement of an object in any direction.
Difference between speed and velocity?
Speed tell us the rate at which an object is moving. Velocity is the speed, but which tells us the rate at which an object is moving in a specific direction.
VIFs about the motion-graphs.
On a distance-time graph, the gradient of the line is numerically equal to the speed.
On a speed-time graph, the gradient of the line is numerically equal to the acceleration.
On a speed-time graph, the area under the line is numerically equal to the distance travelled.
Name all the types of forces.
Friction & air resistance (opposing the motion), Tension (holding the object), Thrust (The forward force), Up thrust (force pushing objects to float), Compression (Force squashing an object) and Magnetic (non contact force between magnets).
What’s known as Newton’s first law of motion?
And his second law?
And his third law?
. Newton’s first law of motion was: If no external force is acting on it, and object will
- if stationary, stay stationary.
- if moving, it’ll keep moving at a steady speed in a straight line.
. Second law of motion:
Force = mass * acceleration
. Third law of motion:
To every action there’s an equal but opposite reaction force.
What are scalar and vector quantities?
Scalar quantities are the ones which have a magnitude with NO direction, whereas vector have both.
What is terminal velocity?
The constant speed that a freely falling object eventually reaches when the air resistance on it and its weight are on equilibrium.
Name 2 kinds of frictions and their function.
Static friction - The force that keeps at object at rest.
Dynamic friction - The force that opposes the movement of an object which is already in motion.
What’s the word for ‘an inward force needed to make an object move in a circle’ ?
Centripetal force.
What is momentum?
It’s a measurement of mass in the motion, a vector quantity.
