Forces Flashcards
The steeper the line -
The faster your going
What is the formula for average speed?
Average speed = distance
Time
/ = ? Distance graph
- = ?
) = ?
( = ?
/ = Constant speed - = Stationary ) = Accelerating ( = Decelerating
The velocity of a body is its speed -
In a given direction
What is the Acceleration formula?
Acceleration = Velocity change
Time taken
/ = ? Velocity graph - = ? \ = ? ) = ?
When is the car stationary on a distance time graph?
/ = Accelerating - = Steady speed \ = Deceleration ) = increasing acceleration
At 0
A force acting on an object can change its: (3)
- Speed
- Direction
- Shape
The length of the arrow shows how _______ the force is.
The length of the arrow shows how strong the force is.
Forces are measured in ________.
Forces are measured in newtons.
A vector quantity has ______ + __________.
A vector quantity has size + direction
A force is a ______ or _____ acting on an object.
A force is a push or pull acting on an object.
( )
/_______ ( ) ____ \
\ ( ) /
Left
( )
/_______ ( ) ____ \
\ ( ) /
______
/ \
/__|________| _______\
\ O O /
Right ______
/ \
/__|________| _______\
\ O O /
The force of attraction between any 2 body mass
Gravity
The upward force in water, equal to the weight of the displaced water.
Up thrust
The force that opposes the motion of 2 surfaces In contact with each other.
Friction
Distance travelled
Distance travelled
_______________ = _______________
Distance travelled = Area under the graph
5 | /
|/____
4
|
5 | / 5x4= 20 / 2 = 10
|/___.
4
Resultant force
Resultant force
Velocity time graph is the ______ under the graph.
Velocity time graph is the area under the graph.
If a force acts on something you will see a change in ________, ________ or _________.
If a force acts on something you will see a change in speed, shape or direction.
______
-> |______| ->
How do you work it out?
You find a resultant force.
- or +
If there is not a __________ force there is ___ charge.
If there is not a resultant force there is no charge.
If the resultant force is _____ you see a change in ________, ________ or ______.
If the resultant force is 0 you see a change in speed, direction or shape.
If a force acts to oppose movement this is called …
Friction
When __ touching _________ experience a ________ when they _______ _______ each other and kinetic energy is __________ to ______ energy this is called ________.
When 2 touching surface experience a force when they move over each other and kinetic energy is converted to heat energy this is called friction.
The size of acceleration depends on the size of the ________ and ________ of an object.
The size of acceleration depends on the size of the force and mass of an object.
Terminal velocity is …
The maximum speed of an object there there can be no more acceleration
Faster the object is travelling ….
The longer the braking distance harder to stop.
The weight of an o an object is through …
The centre of its gravity
If an object leans over its base then it will …
Topple over
Hookes law definition
The extension of a spring is directly proportional to the forces used to stretch the spring.
A rubber band ______ obey hooks law
Doesn’t
A spring ________ obeys hookes law
Does
Factors that might increase stopping distance
Greater speed
Tiredness
Alcohol and drugs
Distractions
Braking distance might be increased by
Greater speed
Poor road conditions (icy, wet)
Car conditions (bald tyres, poor brakes, full of people)
The stopping distance is much further for faster speeds, which is why you should:
Keep your distance from the car in front, especially if the road conditions are poor.
Keep to the speed limit.
Faster traveling ___________ the braking distance to stop
Faster traveling longer the braking distance to stop
The weight of an object is though it’s …
The weight of an object is though it’s centre of gravity
Total stopping distance = ….
Thinking distance and braking distance
