Forces Flashcards
(18 cards)
What is the equation for momentum
P = mv
What is the formula for resultant force?
F = ma
What is terminal velocity
When an object has reached its maximum speed
What is Newton’s first law
A resultant force on an object is needed to speed up or slow down objects
What happens when a resultant force on a moving object is zero
Move at steady speed
What happens to an object when a stationary object is zero
Stays still
What is Newton’s third law
Every action has an equal and opposite reaction
Why is a book resting on a table not Newtown’s third law?
Because the objects are in equilibrium and are different types of forces
What is the equation for stopping distance
Stopping distance = braking + thinking distance
What is thinking distance affected by?
Reaction time
What is braking distance affected by?
Brake quality
Tire grip
Icy roads
What happens in energy when a car breaks?
The friction from the break to the tire causes energy from the kinetic energy store to be transferred to the thermal energy store, causing the wheels to break
Momentum before = ——-
Momentum after
Equation for acceleration
a = change in velocity / t
Typical speeds
walking -
Running -
Cycling -
Car -
Train
Plane -
1.5
3
6
25
30
250
What is the equation for speed
Speed = distance / time
What is the equation linking weight and gravity and mass
Weight = gravity x mass
Equation for work done, force and distance
Work done = force x distance
