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55 Cards in this Set

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What happens when two forces act in the same direction?
Add together
The tendency for an object to resist a change in its motion is known as this.
Inertia
The greater the __________ of an object, the greater its inertia.
Mass
The force of gravity on a person or object on the surface of a planet is called this.
Weight
What should you do to increase acceleration?

Decrease mass, Increase mass, or both
Decrease mass
The force that one surface exerts on another when the two rub against each other is called this.
Friction
When the only force acting on a falling object is gravity, the object is said to be this.
In free fall
Air resistance is a type of ________.
Friction
Product of an object's mass and velocity is called it this.
Momentum
The momentum of an object is is in the same direction as its this.
Velocity
To increase momentum you should:

Increase mass
Increase velocity
Increase mass and velocity
Increase acceleration
Increase mass and velocity
The force that pulls falling objects toward Earth is called ____________.
Gravity
The SI unit for force.
Newton
A unit of pressure is called this.
Pascal
Air pressure decreases as elevation ______________.
increases
Pascal's principle deals with this type of substance.
Fluids
True or False

Buoyant force acts in a downward direction.
False
Amount of matter in an object is called this.
Mass
True or False

According to Newton's third law of motion, when a hammer strikes a nail and exerts a force, the nail disappears into the wood.
False
True or False

Balanced forces on an object always change the object's motion.
False
True or False

Air pressure exerted equally on an object from different directions is balanced pressure.
True
Water pressure increases as depth ______________.
increases
True or False

If an object floats, the volume of displaced water is equal to the volume of the entire object.
False, only submerged portion
This rule states that the buoyant force on an object is equal to the weight of the fluid displaced by the object.
Archimedes' Principle
When water fills a submarine's flotation tanks, the overall density of the submarine _________.
Increases
True or False

A ship stays afloat as long as the buoyant force is less than the ship's weight.
False
Mass per unit volume of a substance is its _____________.
Density
An object that is more dense than the fluid in which it is immersed will do this.
Sink
A material that can easily flow is called this.
Fluid
When an object's distance from another object is changing, it is in ______________.
Motion
Speed equals distance divided by ____________.
Time
When you know both the speed and direction of an object's motion, you know this about the object.
Its velocity
If one of Earth's plates moves 5 cm every year, how far will it move in 500 years?
25 meters
The rate at which velocity changes is called this.
Acceleration
To determine the acceleration rate of an object, you must calculate the change in speed during each unit of ____________.
Time
True or False

Average speed is the total distance traveled multiplied by the total time
False, Divided
A place or object used for comparison to determine if an object is in motion is called this.
A reference point
On a graph showing distance versus time, a horizontal line represents an object that is:

moving at a constant speed or
not moving at all
Not moving
If you know the distance an object has traveled in a certain amount of time, you can determine this.
Speed of object
Changing direction is an example of a kind of _______________.
Acceleration
If Jared travels 30 km in two hours, his average speed is this.
15 km/h
If you know a car traveled 200 km in 2 hours, you can find its:

Velocity
Acceleration
Average Speed
Average speed
In an acceleration graph showing speed versus time, a straight line shows the acceleration is:

Constant
Decreasing
Increasing
Constant
The overall force on an object after all the forces are added together is called this.
Net force
A person traveling in a car that stops suddenly keeps moving forward due to this.
Inertia
This acts in a direction opposite to an object's direction of motion.
Fricton
The pressure resulting from a force of 50 N exerted over an area of 5 meters squared is ___________.
10 Pascals
This force acts in the direction opposite the force of gravity
Buoyant
A penny sinks in water because the penny is more _________ than the water.
dense
When riding a bike past a building, you are not moving relative to this.
Bike
The statement that the motion of a storm is 10 km/day in an easterly direction is a description describing the storm's this.
Velocity
Acceleration is the rate of change in ____________.
speed
This occurs when an object slows down.
Deceleration
If a train traveling at 30 m/s brakes to a stop in 1 minute, its acceleration is _____________.
0.5 m/s/s
Unscramble the term

teeeandoiclr
Deceleration