Science - Chapter 2 Forces

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What happens when two forces act in the same direction?

Their strengths are added.

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?

between your bike tires and the road as you ride

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

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