Unit 4: Newton's Laws Flashcards
True or false: an object with no net force acting on it could be moving
true
True or false: in deep space, you could exert a force on an object without it exerting a force on you
false
True or false: an object with only one force acting on it must be accelerating
true
True or false: friction can cause acceleration
true
True or false: an object that has only 3 forces acting on it could be at rest and remain at rest
true
True or false: an object with only one force acting on it could be at rest and remain at rest
false
True or false: when you punch a glass window and break it, you exert more force on it than it exerts on you
false
True or false: if an object is accelerating, all forces acting on it MIGHT be balanced
false
True or false: in order for an object to maintain a constant velocity, a new force must be applied to it
false
True or false: if all the forces acting on an object do not balance, the object’s velocity must be changing
true
In physics, a ______ is a push or a pull.
force
The standard unit of force is the ________.
Newton
The standard unit of mass is the ____________.
kilogram
The ____________ is the sum of all the individual forces acting on an object.
net force
Newton’s First Law:
If the net force on an object is zero, _______________.
it will not accelerate
its velocity will not change
If the object is at rest, it will remain at rest.
static equilibrium
The net force on an object can be zero in two different ways:
- no forces act on the object
2. the forces that act on the object all balance
_______ is a force that opposes motion and therefore can cause a change in an object’s velocity.
friction
Newton’s Second Law:
If the net force on an object is not zero, ___________________.
the object will accelerate because it has a force imbalance
If the net force on an object is not zero, the acceleration will be in the direction of the __________.
net force
If the net force on an object is not zero, the ___________ will be directly proportional to the net force.
acceleration
If the net force on an object is not zero, the acceleration will be inversely proportional to the ____.
mass
Netwon’s Third Law:
Forces always _____________.
occur in pairs
The forces in every pair are equal in ______________, but opposite in direction.
strength (magnitude)
The _______________ is a supporting force applied on an object in a direction that is perpendicular to the supporting force.
normal force
Frictional force is always __________________.
in opposition to motion
if the box moves up the ramp, friction is down and vice versa
