Unit 5: Force, Mass, Acceleration Flashcards
the force that resists motion
friction
the pulling force
tension?
the pushing force (ground force)
normal force?
the resistance force on a non-moving object
static friction
the resistance force on an object in motion
sliding friction
objects can be moving and still have a net force of zero if there is no ___________
acceleration
forces are classified as one of these two:
contact force
non contact force
what is 1kg in Newtons?
1kg = 9.8N
what is 1lb in Newtons?
1lb = 4.45N
Newton’s 1st Law
the law of inertia
“an object at rest will stay at rest. an object in motion will stay in motion. unless acted upon by an unbalanced force”
Newton’s 2nd Law
the law of acceleration
“the greater the mass of an object, the greater the amount of force needed to accelerate the object. F=MxA.”
Newton’s 3rd Law
the law of equal and opposite forces
“every action has an equal and opposite reaction”
F=
F=MxA
M=
M=F/A
acceleration=
a=F/m
acceleration=
a=change in V over time
a Newton is the same thing as…
kg x m/s^2
list the four contact forces
- normal force
- friction
- tension
- elastic
list the non contact forces
- gravity
- magnetic
- electricity
how do you find weight?
mass times the force of gravity
true or false: in order for an object to remain at rest, the friction force must be larger than the applied force
FALSE. the forces can be equal.
true or false: static friction is always equal to applied friction
TRUE. Once you overcome an object and start to push it, it changes to sliding friction, so true!
If a plane has two forces acting on it, one pushing 200N to the left and one pushing 50N to the right, what is the net force?
150N to the left
