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P2 2 Forces
- Forces between objects
- A force can change the
shape of an object or change
its motion or state of rest
- The unit of force is the newton (N)
- When two objects interact, they always exert
equal and opposite forces on each other
- If object A exerts a force on object B,
then object B exerts an equal force
on object A in the opposite direction
- If object A exerts a force on object B,
then object B exerts an equal force
on object A in the opposite direction
- A force can change the
shape of an object or change
its motion or state of rest
- Resultant force
- The resultant force is a single
force that has the same effect as
all the forces acting on an object
- If the resultant force on a stationary object
is zero, the object will remain at rest
- If the resultant force on a moving object
is zero, the object will continue moving
at the same speed in a straight line
- If the resultant force on an object is not
zero, the velocity of the object will change
- Remember, velocity means
speed AND DIRECTION
- Remember, velocity means
speed AND DIRECTION
- If two forces act on an object along
the same line, the resultant force is ...
- ... their sum if the forces
act in the same direction
- ... their difference if the forces
act in opposite directions
- ... their sum if the forces
act in the same direction
- The resultant force is a single
force that has the same effect as
all the forces acting on an object
- Force and acceleration
- The bigger the resultant
force on an object, the
greater its acceleration
- The greater the mass of an
object, the smaller its
acceleration for a given force
- Resultant force (in newtons) = mass (in kilograms) x acceleration
- F = ma
- F = ma
- The bigger the resultant
force on an object, the
greater its acceleration
- On the road
- Friction and air resistance
oppose the driving force of a car
- "Oppose" means they act
in the opposite direction
- "Oppose" means they act
in the opposite direction
- Stopping distance = thinking distance + braking distance
- Slow reaction time and high speed
increase the thinking distance
- Slow reaction time can be caused
by tiredness, alcohol or drugs
- Slow reaction time can be caused
by tiredness, alcohol or drugs
- High speed, poor weather conditions and poor
maintenance increase the braking distance
- Slow reaction time and high speed
increase the thinking distance
- Friction and air resistance
oppose the driving force of a car
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