yuh Flashcards
Force
any push or pull on other object
Inertia
The propernty of an object that reisist change in motion
Newton
SI unit of force
Net force
The combination of all forces acting on an object
Newtons First last
an object at
rest will stay at rest and an object in
motion will continue in motion with the
same velocity unless acted on by an
outside force
NEWTON’s Second Law
relates
the net force acting on an object to
its mass and acceleration
WEIGHT
the force of gravity
acting on an object
AIR RESISTANCE
a force that acts
against the force of gravity on an object in
free fall
NEWTON’s Third Law
whenever
one object exerts a force on another
second object exerts an equal and
opposite force on the first
MASS
the amount of matter an
object is made of
ACCELERATION
the rate at which velocity
changes; an object accelerates if its speed
changes, if its direction changes, if its
direction changes and if both speed and
direction changes
FRICTION
a force that opposes
motion between two object that are
touching
Which statement illustrates Newton’s first law?
a stone will not move unless something pushes or pulls it.
a ball rolling across the floor eventually slows down
as a car comes to a stop, the passengers continue to move forward
all of the above
All of the above
Which object has the greatest inertia?
a tennis ball
a beach ball
abowling ball
a volleyball
A bowling ball
What force causes a skater sliding on the ice to gradually slow down? balanced force
friction
inertia
acceleration
friction
A seat helps you when your car stops suddenly by providing a(n)
balanced forward force
balanced backward force
unbalanced forward force
unbalanced backward force
unbalanced backward force
One newton is the force that can give a mass of 1 kg an acceleration of
1 m/s
9.8 m/s
1 m/s2
9.8 m/s2
1 m/s2
Which of the following will result in the greatest acceleration?
56 N acting on a 1 kg box
c. 23 N acting on a 2 kg box
56 N acting on a 2 kg box
d. 23 N acting on a 5 kg box
56 N acting on a 1 kg box
What unbalanced force is needed to give a 976 kg vehicle an acceleration of 2.50 m/s2?
2240 N
c. 22240 N
240 N
d. 2440 N
2440 N
A force of 240.0 N causes an object to accelerate at 3.2 m/s2. What is the mass of the object?
0.013 kg
b. 75 kg
c. 240 kg
d. 768 kg
768 kg
A 0.25 kg steel ball experiences a net force of 1. 15 N as it rolls down a ramp. What is the
acceleration of the ball?
0.29 m/s2
b. 0.90 m/s2
c. 1.4 m/s2
d. 4.6 m/s2
d. 4.6 m/s2
If an equal force is applied to two cars an equal mass, CAR A and CAR B,
CAR a will have ________________ acceleration as (than) CAR B.
the same
b. greater
c. less
d. opposite
the same
The gravitational force between two objects depends on masses of objects and
accelerations of objects
c. speeds of objects
distance between objects
d. sizes of objects
distance between objects
Which of the following objects exerts a gravitational force?
a bowling bowl
c. a feather
a book
d. all of the above
all of the above
Increasing which of these conditions results in more gravitational force between two objects?
distance
b. acceleration
c. mass
d. surface area
Mass
When an object is in free fall, the only force acting on it is
gravity
c. inertia
friction
d. terminal velocity
gravity
Whenever a force is exerted, another force occurs that is _________ in size, and ______ in
direction.
equal, same
c. equal, opposite
smaller, same
d. smaller, opposite
c. equal, opposite
Car suddenly stops and you strain against the seatbelt.
1ST LAW OF INERTIA
The difficulty of pushing a car that won’t start
1ST LAW OF INERTIA
Hitting a softball, the harder hit the faster the goes ball
2ND LAW OF ACCELERATION
Loaded versus an unloaded truck
2ND LAW OF ACCELERATION
Two car hits head on
3RD LAW OF ACTION REACTION
Astronaut in space
3RD LAW OF ACTION REACTION
Football players and their position
2ND LAW OF ACCELERATION
Car turns left and you appear to slide to the right
1ST LAW OF INERTIA
Jumping out of a boat onto a dock
2ND LAW OF ACCELERATION
A skateboard moves faster in the same direction it is pushed
2ND LAW OF ACCELERATION
