2. Motion Under Gravity Flashcards
v =
u + at
Average speed =
Distance / time OR u + v / 2
State Newton’s First Law (relating to balanced forces)
An object will continue in its present state of rest or motion unless acted upon by a resultant external force.
What does Newton’s first law prove?
Newton’s First Law proves that any object moving at a steady speed in a straight line has zero resultant force acting on it.
Give the equation which links to Newton’s Second Law about unbalanced forces.
RF = ma
where RF is the unbalanced force in N
m is the mass in kg
and a is the acceleration in m/s^2
Unbalanced forces cause the velocity of an object to …
change
State Newton’s Third Law
If object A exerts a force on object B then object B exerts an equal and opposite force on object A.
Which law can explain why a book might remain stationary on a table ?
Newton’s Third Law.
Define Mass
Mass is the amount of matter in a body.
Define Weight
Weight is the force of gravity on an object.
Define Inertia.
Inertia is a property where a large mass shows a greater reluctance to change its velocity than a small mass from the same pushing force.
W =
mg
All objects close to Earth experience…
the same acceleration due to gravity, g
On Earth, g =
10 m/s^2
g is in m/s^2 for…
g is in N/kg for…
g is in m/s^2 for an object in free fall close to a planet’s surface.
g is in N/kg for the strength of a gravitational field.
