Forces and motion yr10 Flashcards
What are vectors?
- Magnitude and direction
Examples:
displacement
velocity
acceleration
momentum
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What are scalars?
- Only magnitude (size)
Examples:
distance
speed
temperature
energy
mass
volume
What 3 things can happen when you exert a force?
- change in shape
- change in speed
- change in direction
Formula of relation between speed, distance and time
speed = distance/time
Formula of relation between force, mass and acceleration
force = mass x acceleration
What formula to find final velocity?
v^2 = u^ + 2as
What is the stopping distance and how do you calculate it?
Stopping distance is the distance to stop from seeing a problem.
stopping distance = thinking distance + braking distance
What is thinking distance and what are some examples?
The thinking distance depends only on the driver and how fast you are going - the time it takes between you seeing the hazard and using the brakes.
examples:
alcohol
use of drugs or medicine
tiredness
use of mobile phone
speed of car
What is braking distance and what are some examples?
The braking distance depend on the car and the road conditions - the time between using the brakes and the car stopping.
examples:
mass of car
tyre wear
weather
faulty brakes
speed of car
what is resultant force?
The resultant force is the net force when all the forces acting on an object have been combined.
what is friction?
the force acting in the opposite direction of motion of the object.
what are unbalanced forces?
unbalanced forces occur when the forces acting on an object are not equal and opposite.
what is weight and how do you calculate it?
weight is the force due to gravity.
weight = mass x gravitational field
how do you find the distance travelled on a velocity-time graph?
it’s the area under the graph
What does a horizontal line on a velocity-time graph mean?
There is a constant velocity
