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A single vector can be replaced by two vectors in the X and Y directions. These X and Y vectors are called the resultant of the original
A vector is a quantity that has
What is terminal speed?
If the net external force acting on a system is zero, then the total momentum of the system is zero.
Impulses are smaller when bouncing takes place.
After a firecracker falling through the air explodes, the net momentum of its fragments decreases.
The padding on car dashboards lengthens the time of a passenger’s impact during a collision.
If a net force acts on a system, the system’s momentum will change.
Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour?
Compared to a sports car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has
If the momentum of an object changes and its mass remains constant
The momentum change of an object is equal to the
impulse acting on it
If Superman at rest in free space throws an asteroid that has more mass than Superman, then which moves faster?
A Ping-Pong ball launcher is fired. Compared to the impulse on the ball, the amount of impulse on the
The cannonball launched from a cannon with a long barrel will be faster because the cannonball receives a greater
m1 x v1 + m2 x v2 + mt x vt is used to
An arrow in a bow has 70 J of potential energy. Assuming no energy loss, how much kinetic energy will it have after it has
The rate at which work is done is called power
The energy an object has by virtue of its location is called its potential energy
The energy an object has by virtue of its motion is called its kinetic energy
More power is needed to carry a heavy suitcase slowly up a flight of stairs than to carry the suitcase quickly up the same flight of stairs.
If you lift one load up two stories, how much work do you do compared to lifting one load up only one story?
If Nellie Newton pushes an object with twice the force for twice the distance, she does
How much work is done on a 50-N rock that you lift 10 m straight up?
How much power is expended if you lift a 50-N rock 10 meters in 1 second?
An object that has kinetic energy must be
If Skelly the skater’s speed is increased so he has twice the momentum, then his kinetic energy is increased by
How much work is done in lifting 30 kg of bricks to a height of 20 m?
Wind velocity can be represented as a vector quantity.
The vertical component of velocity for a projectile varies with time, even with no air resistance
The horizontal component of velocity for a projectile varies with time, even with no air resistance
When velocity is represented as a vector
What is the minimum resultant possible when adding a 3-unit vector to an 8-unit vector?
What is the maximum resultant possible when adding a 3-unit vector to an 8-unit vector?
An airplane flying into a head wind loses ground speed, and an airplane flying with the wind gains ground speed. If an airplane flies at right angles to the wind, then ground speed is
Which of the following would NOT be considered a projectile?
A cannonball thrown straight up
the vertical component of its velocity
A ball is thrown into the air at some angle between 10 degrees and 90 degrees. At the very top of the ball’s path, its velocity is
Which formula would you use to solve a problem like this:
A boat is rowed at 6.0 km/h directly across a river in water that is flowing at right angles at 8.0 km/h. What is the resulting speed of the boat?
Objects move only when a force is exerted
The acceleration of an object is inversely proportional to the net force acting on it
Air resistance is caused by friction between the air and an object moving through the air.
Pressure is defined as the force one object exerts on another object
The speed of an object dropped in air will continue to increase without limit until it strikes the ground
The acceleration produced by a net force on an object is
If the force acting on a cart doubles, what happens to the cart’s acceleration?
A girl whose weight is 200 N hangs from a bar supported by two strands of rope. What is the tension in each strand
Pressure is defined as
force per unit area
Which of the following would exert the most pressure on the ground
A woman standing in high heel shoes
A tennis ball and a solid steel ball the same size are dropped at the same time. Which ball has the greater force acting on it
A tennis ball and a solid steel ball the same size are dropped at the same time. In the absence of air resistance, which ball
has the greater acceleration
Explain why acceleration of an object in free fall does not depend upon the mass of the object
As he falls from a high-flying stationary helicopter, Bronco’s velocity increases and his acceleration
When a skydiver has reached terminal speed, what is the air resistance equal to?
What is the skydiver’s acceleration
Whenever one object exerts a force on a second object, the second object always exerts the same amount of force back on the first object.
Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object
A rocketship is pushed forward by gases that are forced out the back of the ship
If a bicycle and a parked car have a head-on collision, the force of impact is greater on the bicycle
The earth and moon pull on each other with equal amounts of force
A high school student hits a nail with a hammer. During the collision, there is a force
A woman weighing 500 N sits on the floor. She exerts a force on the floor of
As a 500 N woman sits on the floor, the floor exerts a force on her of
Forces always occur
An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug,
the amount of force of the bug on the car is
An unfortunate bug splatters against the windshield of a moving car. Compared to the deceleration of the car, the
deceleration of the bug is
The net force on an object is the combination of all forces that act on it
An object can be in equilibrium whether it is at rest or moving steadily at constant speed in a straight line
A scalar quantity has both magnitude and direction, whereas a vector quantity is described by only its direction
An airplane in an acrobatic loop-the-loop maneuver is in dynamic equilibrium if the speed is constant
Nellie Newton can hang suspended from the middle of two ends of a rope in such a way that the tension in the rope can greatly exceed her weight
Suzie holds an apple at rest in her outstretched hand. The force she applies in holding it still
A pair of parallel forces of 8 N and 12 N can have a resultant of
The number of forces that act on a bag of sugar suspended by a weighing scale are
The equilibrium rule, sum of all F = 0, applies to
The equilibrium rule, F = 0, applies to
When you press a coiled spring downward, the spring presses upward on your hand with
the same amount of force
When you stand on two bathroom scales, one foot on each scale with weight evenly distributed, each scale
When Nellie Newton hangs by a pair of vertical ropes, the tension in each rope will be
When Burl and Paul stand on the scaffold, explain why the sum of the tensions in the supporting ropes must equal the weights of Burl and Paul, plus anything else on the scaffold.
The amount of matter in an object is called its weight.
The SI unit force is called the kilogram
If a hockey puck slides on a perfectly frictionless surface, it will eventually slow down because of its inertia
Inertia is the reluctance any material object has to change in its state of motion.
The combination of all the forces that act on an object is called the net force.
The astronomer Copernicus was the first person to publicly state that Earth
revolves around the sun
Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to
Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane?
To the nearly the same height as where it originally started
The law of inertia states that an object
The law of inertia applies to
After a cannon ball is fired into frictionless space, the amount of force needed to keep it going equals
zero, since no force is necessary to keep it moving
Which has more mass, a kilogram of feathers or a kilogram of iron?
Neither. The masses are equal
A 10-N force and a 30-N force act on an object in opposite directions. What is the net force on the object?
On the surface of Jupiter the acceleration due to gravity is about 3 times that on Earth. How much would a 100 kg rock weigh on Jupiter?
The rate at which velocity changes with time is called acceleration
The SI unit of acceleration is meters per second
When a car rounds a corner at a constant speed, its acceleration is zero.
A ball is thrown into the air. At the highest point, the ball has zero velocity and zero acceleration
As a ball falls freely, the distance it falls each second is the same
When you look at the speedometer in a moving car, you can see the car’s
Acceleration is defined as the CHANGE in
velocity divided by the time interval
Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of
the following is NOT true?
Your velocity is constant.
A ball is thrown straight up. At the top of its path its acceleration is
about 10 m/s2
In science, an educated guess about the answer to a scientific question is called a hypothesis.
The synthesis of a large collection of information that encompasses well-tested and verified hypotheses about certain aspects of the natural world is known as a scientific theory.
When scientific findings are expressed mathematically, they are easier to verify or disprove by experiment.
A scientific fact is something that is absolute and unchanging.
A hypothesis is scientific if there exists a test for proving it wrong
A scientific fact is
close agreement by competent observers of observations of the
an educated guess that has yet to be proven by experiment
A theory is
a synthesis of a large collection of information including well-
Which of these is a scientific hypothesis? Why?
Atoms are the smallest particles of matter that exist (because it is testable)
To test a scientific hypothesis you would
set up many experiments and look at the results.
The difference between a hypothesis and a theory is that a hypothesis
is a guess that has not been well-tested, whereas a theory is a
synthesis of well-tested and verified guesses.
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