Forces Flashcards
What makes forces balanced
When they are of equal size and in opposite directions
What happens when forces are balanced
The object moves at a constant speed
What happens when the forces on an object are unbalanced
It will accelerate or decelerate
What do we use to represent the direction and size of forces
Arrows
What is Newton’s first law
An object will remain at rest or continue to move with a constant velocity as long as the forces acting on it are balanced
What is Newton’s second law
Force (n) = mass (kg) x acceleration (m/s^2)
What is Newton’s third law
Friction affects acceleration
It will keep constant speed
The heavier the object the longer it will take to accelerate
How do we work out the resultant force
The difference between the forces
What is mass
The measure of the amount of material in an object. (Kg)
What is weight
The force of gravity on an object. (N)
How can we work out the weight from mass and gravitational pull
Weight (N) = mass (Kg) x gravitational pull (N/kg)
How do we calculate momentum
Momentum (Kgm/s) = mass (kg) x velocity (m/s^2)
What do seat belts do
They increase the declaration time in a collision so reduce forces on a passenger
