Topic 2-forces And motion Flashcards
Newton’s first law?
A moving object will stay moving at the same speed and direction unless an external force acts on it. A stationary object will stay still unless an external force acts on it
Newton’s second law?
Force = mass X acceleration
Newton’s third law?
Every action has an equal and opposite reaction
What do all forces have?
A magnitude(size) and a direction
Vector?
Quantities that have both size and direction
What is mass?
The amount of matter in something
Scalar?
Do not have direction
Difference between vector and scalar?
Vector has a magnitude and direction, scalar just has magnitude but no direction, such as mass
Displacement?
Displacement is the distance covered in a straight line, and has direction
Difference between speed and velocity?
Speed tells you distance covered in an amount of time, velocity also tells you which direction the speed is in
Acceleration?
A measure of how fast velocity is changing
Momentum?
A combination of mass and velocity
Speed equation
Average speed= distance/time taken
Distance equation
Distance = speed X time
Acceleration equation?
Acceleration= change in velocity/time taken
