40 terms

Science - Chapter 2 Forces

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What happens when two forces act in the same direction?
The greater the mass of an object
the greater its inertia
The force of gravity on a person or object on the surface of a planet is called
weight
The force that one surface exerts on another when the two rub against each other is called
friction
The law of universal gravitation states that any two objects in the universe that have mass, without exception,
attract each other
Forces can be added together only if they are
acting on the same object
According to the law of conservation of momentum, when two objects collide in the absence of outside forces
the objects have the same momentum before and after they collide
Any force that causes an object to move in a circle is called a(n)
centripetal force
The momentum of an object is in the same direction as its
velocity
According to Newton's third law of motion, when a hammer strikes and exerts force on a nail, the nail
exerts an equal and oppostie force on the hammer
In physical science, a push or pull is called a(n)
force
Which of the following is an example or rolling friction?
Which of the following is an example of increasing friction intentionally?
throwing sand on an icy driveway
The force of gravity on a person or object at the surface of a planet is known as
weight
The amount of matter in an object is called its
mass
The force that pulls falling objects toward Earth is called
gravity
The tendency of an object to resist change in its motion is known as
inertia
The product of an object's mass and velocity is called its
momentum
How can you increase the momentum of an object?
by increasing its mass
The total momentum of a group of objects is conserved unless
outside forces act on the objects
An object that orbits another object in space is called a(n)
satellite
When the only force acting on a falling object is AIR RESISTANCE, the object is said to be in free fall. T or F
F - when the only force acting on a falling object is GRAVITY
The property of matter that resists a change in motion is called INERTIA. T or F
True
According to Newton's second law of motion, WEIGHT depends on an object's mass and the net force acting on the object. T or F
F - ACCELERATION
Friction depends on the types of surfeaces involved and how HARD the surfaces push together. T or F
True
Mass and AIR RESISTANCE affect the gravitational attraction between objects. T or F
DISTANCE
The overall force on an object after all the forces are added together is called the _______ force.
Net force
One _________ is the force required to accelerate 1 kilogram of mass at 1 meter per second per second.
Newton
The force of gravity between you and the Earth is greater than the force of gravity between you and a car because Earth has more _____ than the car.
Mass
According to Newton's third law of motion, the strength of a reaction force is _______ the strength of the action force.
opposite
The force of gravity is responsible for continuously changing the ______ in which a satellite moves.
orbit
Wet pavement is more slippery than dry pavement because the force needed to overcome ________ friction is less than the force needed to overcome sliding friction
fluid
Friction acts in a direction ______ to an object's direction of motion.
opposite
As the distance between two object's decreases, the gravitational force between them ___________.
increases
An object's inertia is a measure of its
mass
A person traveling in as car that stops suddenly keeps moving forward due to
inertia
If the action force of a bat striking a ball accerlerates the ball in one direction, the reaction force accelerates the bat in the _________ direction.
opposite
The momentum of an object is in the same ___________ as its velocity.
direction
The momentum of a roller skate in not conserved because ________ acts on the skates.
friction
Because the moon travels around the Earth, it is a(n) ___________.
satellite