Motion is an object's change in position relative to a _________________.
On your drive to the mountains, you travel 270 miles in 6 hours. What is your average speed?
___________ miles per hour
You are riding in a train that is traveling west at 60 miles per hour. If you through a baseball down the aisle of the train and the baseball travels east at 40 miles per hour, what is the resultant velocity of the baseball relative to a point immediately behind the train.
20 mph
100 mph west
20 mph west
20 mph east
You are riding a bike along a bike path at a velocity of 15 mph. You come to a downhill portion of the bike path. It takes you 3 seconds to go down the hill. At the bottom of the hill your velocity is 21 mph. What was your average acceleration?
____________ (m/h)/s
If you are running at a constant speed, and you run around a corner, you will be accelerating as you go around the corner.
True
False
Force has size and ____________.
The International Scientific unit of measure for force is the ______________.
You are playing tug of war with your sister. She is pulling 22 Newtons to the right. You are pulling 18 Newtons to the left. What is the net force?
4 Newtons to the right
4 Newtons to the left
40 Newtons to the right
4 Newtons
If you apply unbalanced forces to an object, what may happen? (Check all that may apply.)
The object changes direction.
The object remains motionless.
The object changes speed.
The object starts of move from being motionless.
The object continues in the same direction at the same speed.
A force that opposes motion between two surfaces that are in contact is called _____________.
When an object starts moving across a surface, the friction forces that apply are:
kinetic friction only
a combination of kinetic friction and static friction forces
static friction only
no friction forces apply to a moving object
A lubricant can be used to _______________ friction forces.
reduce
increase
____________ is a force of attraction between objects that is due to their mass.
As you increase the distance between two objects, the gravitational force applied to each object _____________
increases
decreases
stays the same
The gravitational force an astronaut feels on the earth is greater than the gravitational force the astronaut feels on the moon because:
the moon has a greater mass than the earth
the earth has a greater mass than the moon
the sun's gravitational force is stronger on the earth.
The gravitational force that keeps the planets in our solar system in orbit is:
___________ is a measure of the gravitational force on an object.
An object can have the same mass, but different weights.
True
False
What is the proper SI unit of measure for weight?
pounds
grams
Newtons
kilograms
9.8 m/s2 is:
If you drop an orange from a hundred story building, what is the orange's velocity after 5 seconds. (Assume there is no air resistance.)
___________ m/s
49
On the earth, the force that causes objects falling through the atmosphere to attain a terminal velocity and prevents further acceleration is:
When gravity is applied to an smaller object that is constantly in circular motion around another larger object (in orbit), that force is called a ___________ force.
A 14 year-old boy who remains at rest in his bed after the alarm goes off on a school day is a good example of Newton's _____________ Law of motion.
First
Second
Third
The tendency of all objects to resist any change in motion is called _____________
The mathematical expression of Newton's second law of motions is:
F = m/a
F = m • a
F = a/m
What force is will it take to accelerate a 200 kg bike rider at a rate of 20m/s2?
___________ N
Object A applies a force of 250 Newtons West is applied to Object B. What force does object B then apply to object A?
200 Newtons
200 Newtons West
200 Newtons East
none
Newton's third law states that all forces act in pairs, the action force and the _____________ force.
The Momentum (p) of an object can be calculated as:
p = m / v
p = v / m
p = m • v
p = m • a
Like velocity, momentum has direction.
True
False
According to the law of conservation of momentum, when two objects collide,
the total amount of resulting momentum is the amount of momentum of the heavier object.
the total amount of resulting momentum is the amount of momentum of the lighter object.
the total amount of resulting momentum stays the same.
the total amount of resulting momentum is the difference between the momentum of the heavier object and the momentum of the lighter object.
The total momentum of two objects of equal mass and equal velocity but in opposite directions is ___________.
Pressure is calculated by:
pressure = force x area
pressure = area / force
pressure = force / area
pressure = force / density
The International Scientific unit of measure for pressure, 1 Newton/ 1 m2 is the ______________.
Atmospheric pressure ___________ as you rise in the atmosphere.
increases
decreases
stays about the same
Fluids flow from:
high pressure to low pressure
low pressure to high pressure
Archimedes' Principle states that:
the buoyant force on an object in a fluid is an upward force that is equal to the weight of the object.
the buoyant force on an object in a fluid is an upward force that is equal to the weight of the fluid that the object displaces.
the buoyant force on an object in a fluid is an downward force that is equal to the weight of the object.
the buoyant force on an object in a fluid is an downward force that is equal to the weight of the fluid that the object displaces.
The purpose of ballast tanks on a submarine is to bring in sea water which increases the submarine's _____________, which then allows the submarine to sink.
Bernoulli’s Principle states that as the speed of a moving fluid increases, the fluid's pressure ________________.
increases
decreases
stays constant
The upward force known as lift on an airplane's wing is caused by
the difference in pressure on the top side of the wing and the bottom side of the wing, the top side pressure being greater than the bottom side pressure.
the difference in pressure on the top side of the wing and the bottom side of the wing, the bottom side pressure being greater than the top side pressure.
An airplane's engine creates a pulling or pushing force known as ____________ which moves the plan through the air
Pascal's principle states that a change in pressure in an enclosed fluid id transmitted unequally to all parts of that fluid.
True
False
The force that can oppose motion through a fluid is called ___________.
Gravity and a buoyant force in a fluid tend to act