Motion Flashcards
State the units of the following terms
Distance
Time
Speed
Rate of change of speed
Two equations for average speed
(Initial speed + final speed). Total distance ➗ total time
————————————-
2.
Equation for rate of change of speed
Change in speed ➗ time
How would you calculate average speed from a distance time graph
Find gradient
What’s the difference between a scaler and a vector
Scalar only includes magnitude whereas vectors use direction and magnitude
Name 3 scalar quantities
Speed distance and mass
State 3 vector quantities
Velocity displacement and acceleration
Equation used to calculate acceleration
Change in velocity ➗ time. U-V ➗ time
What terms can be used to describe negative acceleration
Deceleration and retardation
In a distance time graph what does the gradient represent
Speed
In a speed time graph what does the gradient represent
Acceleration
In a speed time graph what does the area under the graph represent
Distance traveled.
In a displacement time graph what does the gradient represent
Velocity
In a velocity time graph what does the the gradient represent
Acceleration
In a velocity time graph what does the area under the graph represent
Displacement
What is friction
Friction is the force that acts when one surface slides over another. It always opposes the motion- this means that if an object is trying to slide to the left, friction will always act to the right and so on. Friction converts kinetic energy into heat.
What is Newtons 1st law
In the absence of a resultant force an object will remain at rest or continue to move at a constant velocity I.e balanced forces do not produce acceleration.
What is Newtons 2nd law
The acceleration is directly proportional to the resultant force acting on it and inversely proportional to the mass of the object.
What is newtons 3rd law
If body A exerts a force on body B, there is an equal an opposite force exerted in A by B
Equations for newtons 2nd law
F ∝ a
A ∝ 1/m. ∝= directly proportional
Define a newton
A force equal to one newton will accelerate 1kg at 1m/s squared
Equation of force
F=ma
What rate of retardation will objects experience if fired directly upward?
10m/s squared
How to measure the acceleration of free fall (gravity)
Measure height ball is dropped from
Drop ball from a rest
Time how long it takes to reach ground
Repeat two more times ignoring anomalies to find average
Calculate results by using final velocity =2x average velocity then do acceleration = final velocity- initial velocity divided by time
