forces Flashcards
(43 cards)
what is a force
a push or pull on an object
if a person is stationary, what is the downwards force
the weight of the person
if a boat is in the water, what is the upwards force
upthrust of the water
if a plane is in the air, what is the backward force
drag due to air resistance
forces are measured in…
newtons
you measure forces with a…
newton meter
if a ball is on a string, what is the upwards force
tension
if an apple is falling, what are the upwards and downwards forces
upwards = air resistance downwards = gravitational pull/weight
when a ball is on string and someone cuts the string, what would happen and why
the ball would fall becouse the forces would be unbalanced
there is usally more than one force acting…
on a object
we draw force diagrams to…
understand what would happen to an object with forces acting on it
the arrows go in _________ and the size of the arrow is __________
the direction of the force, equal to the force
we draw forces from the…
object
if a book is on a table, the upwards force is…
the contact force
if the forces acting on an object are the same size and in different directions, they will be…
balanced
if the forces are balanced, there will be no change…
in what the object is doing
if an elephant is moving, the upwards and downwards forces are…
upwards = contact force from the ground which supports elephant downwards = weight of the elephant
if an elephant is moving, the forwards and backwards forces are…
forwards = force of the elephant walking backwards = friction of the ground and any forces that stop the elephant from moving
if an elephant is moving and the forces are balanced, the elephant will be moving at…
constant speed
if the forces on an object are balanced…
- an object that is not moving stays still
- an object that is moving continues to move in the same direction and at the same speed
if the forces on an object are unbalanced…
- an object that is not moving starts to move
- an object that is already moving changes speed or direction
mass is…
the amount of matter in a object
weight is the amount of force acting on a mass due to…
the gravitational pull on it
mass should be measured in…
kilograms/kg
