Forces and motion Flashcards
What is a scalar measurement
Variables that have a magnitude
What is a vector measurement
Variables that have direction and magnitude
Eg. Displacement, velocity, momentum
Examples of contact forces
Thrust, Lift, Friction, Air Resistance
Examples of non-contact forces
Weight, Electrostatic, Magnetic
What is meany by ‘work done’
Energy transferred by a force/action
What does Hookes Law involve
Springs
Distance time graphs
At constant velocity when line goes up
Gradient of graph gives speed
As distance furthers, velocity increases (increasing gradient)
Velocity time graphs
Line shows acceleration
Calculating are underneath graph gives distance travelled
What’s newtons first law
An objects motion stays constant if there isn’t any external force acting onto it
Whats newtons second law
when a resultant force is present
Whats Newton’s third law
To every action there is an equal and opposite reaction (balanced forces - always true)
SUVAT - what do they stand for
S - displacement
U - initial velocity
V - final velocity
A - acceleration
T - time
Is suvat used when an object is thrown horizontally?
No - projectile motion
What happened to momentum when there is a bigger force?
Faster change in momentum
What is the stopping distance?
A persons thinking distance + breaking distance in a moving object
