forces Flashcards
state newton’s first law of a stationary object.
If the resultant force on a STATIONARY object is ZERO, the object will remain STATIONARY. If the RESULTANT FORCE on a moving object is zero, it’ll just carry on moving at the SAME VELOCITY (same speed and direction).
Newton’s second law formula:
Resultant force = Mass x Acceleration
F = ma
What does Newton’s Third Law say?
When two objects interact, the forces they exert on each other are equal and opposite.
Explain the difference between Scalar and vector quantities.
Scalar quantities only have magnitude but no direction, vector quantities have both magnitude and direction.
List examples of vectors e.g force…
velocity, displacement, acceleration, momentum etc.
list examples of scalars e.g speed…
distance, mass, temperature, time etc.
List the 3 non-contact forces.
Magnetic force, gravitational force, electrostatic force
Friction is a contact force, list other examples.
air resistance, tension in ropes, normal contact force, etc.
Describe the difference between a contact and non-contact force.
Contact: when two objects need to be touching for the force to act.
Non-contact: when the two objects do not need to be touching for the force to act
explain the difference between weight and mass
Mass is the amount of stuff in the object and weight is the force acting on the object due to gravity.
What is a free body diagram?
Shows all the forces acting on the object.
give the formula calculating the work done by a force and explain what each symbol means
work done = force x distance
W = Fs
what is the stopping distance of a vehicle
stopping distance = thinking distance + braking distance
what is an average reaction time?
between 0.2 - 0.9s
state momentum formula
momentum = mass x velocity
what is the uniform acceleration equation
final velocity squared (m/s) - initial velocity squared (m/s) = 2 x acceleration (m/s) x distance (m)
V² - U² = 2as
When a ____ moves an object through a ____, E____ __ T______ and W____ __ D_____.
when a force moves an object through a distance, energy is transferred and work is done
