Red Flashcards
Topics that I find hard
What is the equation for acceleration?
Acceleration (m/s² ) = change in velocity (m/s) ÷ time (s)
How do you work out the change in velocity?
final velocity - initial velocity
What is a velocity time graph?
The gradient of any graph with time on the x-axis tells you about a rate of change with time. The rate of change of speed or velocity with time tells you the acceleration.
What is Newtons 1st law - Balanced Forces?
If the resultant force acting on an object is zero and the object is stationary it remains stationary. If the object is moving, it continues to move at the same speed and in the same direction. So the object continues to move at the same velocity.
What is Newton’s 2nd Law - Unbalanced forces?
There is a resultant force. When a force acts on an object, it will accelerate. The acceleration is always proportional to the force being applied, so long as the mass remains constant.
Force (N) = mass (kg) x acceleration (m/s² )
What is Newton’s 3rd Law - Interaction pairs?
Whenever two objects interact, the force they exert on each other is equal in size and opposite in direction.
What is Momentum?
All moving objects have momentum. This is a measure of how difficult it is to stop a moving object.
What is the equation for momentum?
Momentum (kg m/s) = mass (kg) x velocity (m/s)
What is the Law of Conservation of Momentum?
The total momentum before collision/ explosion is equal to the total momentum after, as long as there are no external forces exerted on the objects involved.
What is the equation for Hooke’s Law?
Force (N) = Spring Constant (N/m) x Extension (m)
What is Hooke’s Law?
Hooke’s law states that the extension is directly proportional to the force applied, up to the limit of proportionality.
What is the equation for elastic potential energy?
Elastic potential energy (J) = 0.5 x Spring Constant (N/m) x Extension² (m)
