Forces and Motion Flashcards
Acceleration
Rate of change of velocity
How do you calculate acceleration?
a = (v-u)/t
Air resistance
Friction between air and a moving object
Average speed
How fast an object moves in its entire journey
Displacement
A measurement of change in position of a moving object
Distance
A measurement of how far an object moves
Efficiency
A measure of useful energy output of energy transfer
Elastic potential energy?
Energy stored in a stretched or compressed material
Gravitational potential energy?
The potential energy an object has due to its position above the ground
Inertia
Tendency of an object to resist change in motion
Kinetic energy?
Energy of a moving object
Law of Conservation of Energy
Energy may be transferred but is never created or destroyed
Newton’s First Law of Motion
An object at rest or moving in a constant manner will remain that way unless an unbalanced force is exerted upon it.
Newton’s Second Law of Motion
An object will accelerate in the direction of the unbalanced force. Net Force = m x a
Newton’s Third Law of Motion
For every action there is an equal and opposite reaction
Speed
The rate of change in distance
Velocity
The speed of something in a given direction
What can we obtain from a velocity-time graph?
Acceleration = gradient of the graph Displacement = area bounded by the velocity and time axes
What can we obtain from a speed-time graph?
Distance: area underneath the graph
Average speed: the gradient of the graph
What are the SI units for : time, distance, speed, acceleration, force, energy, mass, velocity?
Seconds, Metres, m/s, m/s/s, Newtons, Joule, Kilogram, m/s with a given direction
What is the formula for calculating speed?
Distance/time
