Motion+Forces

Created by

Michelle

Cards (79)

How do you calculate weight?
Mass x gravitational field strength
What is the law of the conservation of momentum?
The total momentum before an event= The total momentum after the event
What is centripetal Force?
An object moving around another object in a circular motion, the speed remains constant. Velcocity constantly changing
What is Mass?
Mass is a measure of the amount of matter that an object contains
What is Newton's second law [formula]?
F=MA
What is Newton's second law[words]?
Acceleration is proportional to the resultant force on an object and inversely proportional to the mass of the object
If a cat sits on the ground what is the force pair acting on the cat?
The cat pulls the earth up and the earth pulls the cat down.
Why is velocity constantly changing with centripetal force?
Because the direction is constantly changing
What is compression? 
A squashing force as something is pushed
What is friction?
A slowing force created by contact with a solid
What is lift?
An upward force that keeps something in the air
What is buoyancy?
An upward force that keeps an object floating in liquid
What are the 10 different forces?
Weight
Friction
Compression
Reaction
Buoyancy
Thrust
Drag
Air resistance
Tension
Lift
If the resultant force on an object is zero, what does this mean?
The object is stationary
Continuing at the same velocity
What is Velocity?
Speed and direction
What is velocity measured in?
Meters per second
How do you calculate momentum?
Momentum is calculated by multiplying an object's mass by its velocity.
What is momentum? 
'Mass in motion', how hard something is to stop
How do you calculate acceleration?
Acceleration is calculated by dividing the change in velocity by the change in time.
Devise an experiment to explain f=ma
Put different amounts of newton weights on the trolley on a hook[attached to the trolley]
Put book under trolley[to reduce friction]
Measure time with stopwatch
Measure distance with a ruler
Place the trolley at 0cm
What is reaction time?
The time between when you see a stimulus and when you react to it
What is Newton's First Law?
An object remains in the same state of motion unless a resultant force acts on it
What 4 things are action reaction pairs
Equal magnitude
Opposite Direction
They never act on the same object
Unbalanced
How do you calculate force with momentum?
Change in momentum-over-time
How do you calculate distance?
Speed x time
How do you calculate time
Distance-over-speed
What is braking distance?
The distance a vehicle travels in the time after the driver has applied the brake
How do you calculate speed?
Distance divided by time.
What is thinking distance?
The distance a vehicle travels in the time it takes for the driver to apply the brakes after realising they need to stop
What is an elastic collision?
A collision where there is no loss in kinetic energy and the two objects move in opposite directions
What is an inelastic collision?
A collision where there is a loss of kinetic energy and the two objects move in the same directions
What is air resistance?
Force that opposes the motion of an object through the air.
What is drag?
Resistance force acting on an object moving through a fluid.
How does mass and acceleration affect the resultant force?
Acceleration increases if the resultant force on it increases and ,decreases if the mass of the object increases
What is Newton's Third Law?
Every Action has an equal and opposite reaction.
What is important about the two forces in Newton's third law?
-They act on different objects
-Are the same type e.g [conatct]
What is weight?
The force of gravity acting on an object
What is a resultant force ? 
The overall force on an object
What is acceleration inversely proportional to?
The mass of the object
What is acceleration proportional to?
Force.