# PHYSICS IGCSE - FORCES AND MOTION

• PHYSICS IGCSE - FORCES AND MOTION
• SPEED
• FORCES
• WEIGHT=force that acts on the body because of gravity.
• FORCES ARE MEASURED IN NEWTONS.
• FORCE, MASS & ACCELERATION
• Average speed = distance/time
• SPEED
• speed and distance are scalar because they don't take direction into account.
• Average speed = distance/time
• ACCELERATION
• PHYSICS IGCSE - FORCES AND MOTION
• FORCES
• WEIGHT=force that acts on the body because of gravity.
• FORCES ARE MEASURED IN NEWTONS.
• FORCE, MASS & ACCELERATION
• Acceleration = change in velocity/time take
• Units = m/s (squared)
• VELOCITY -TIME GRAPHS
• VELOCITY -TIME GRAPHS
• Straight lines = constant acceleration
• FRICTION= force that opposes motion.
• AIR RESISTANCE  = friction between object and air it is moving through.
• UPTHRUST = upward force that liquids and gasses exert on objects.
• ELECTROSTATIC  = the force between electrically charged objects.
• NORMAL REACTION = special name for an object pushing down on another object.
• TENSION = in strings/cables/ ropes that are being stretched.
• Force = mass x aceleration
• Thinking distance = distance before applying breaks
• Breaking distance = distance travelled whilst car is decelerating to stop.
• Breaking distance = distance travelled whilst car is decelerating to stop.
• Aprox. gravity = 10m/s(squared)
• Weight = mass x gravitational field strength
• MOMENTUM
• Momentum = mass x velocity
• moment = force x perpendicular distance from pivot.
• Measured in Kg m/s
• MOMENTUM
• Momentum = mass x velocity
• moment = force x perpendicular distance from pivot.
• Force = change in momentum/time taken
• F =ma
• For every action there is an equal and opposite reaction.
• The rate of change of momentum of a body is proportional to the force acting on it.
• unless there is a force acting on an object, it will continue to move in a straight line at constant speed or remain at rest.