Physics Mid-Term Exam 2022

Which of the following is true about projectiles launched into air?

- their horizontal and vertical displacements are independent of each other - they follow a parabolic path due to gravity - they are always affected by gravity

Which of the following conditions describes an object at equilibrium?

- zero acceleration - constant velocity - not moving

How many high tides are there at any given moment on Earth?

2

Newton's Second Law is known as the Law of __________.

Acceleration

The slope of a velocity v. time graph gives us _________.

Acceleration

___________ is defined as the displacement of an object over the time interval.

Average Velocity (v)

Kinetic Energy is directly proportional to _______.

Both Mass and Speed

Non-perpendicular vectors can be resolved into "x" and "y" __________.

Components

The difference between the final and initial positions of an object is referred to as __________.

Displacement (Δx)

Which of the following quantities tells us magnitude ONLY, and not direction?

Distance

In which of the following collisions is energy conserved?

Elastic

_______ energy is the stored energy of an object due to a stretched or compressed spring.

Elastic Potential

A(n) __________ is an interaction between an object and its environment, and it always produces an acceleration.

Force

_______ energy is the stored energy of an object due to its height.

Gravitational Potential

Which of the following fundamental forces is the weakest?

Gravity

Which of the following fundamental forces have infinite ranges?

Gravity and Electromagnetic Force

What is another word to describe the change in momentum of an object?

Impulse

In which of the following collisions is momentum conserved?

Inelastic

Newton's First Law is known as the Law of __________.

Inertia

Newton's Third Law is known as the Law of __________.

Interaction

The tendency of an object to NOT accelerate is referred to as _________.

Intertia

What is true about the net force on an object if it is at equilibrium?

It Is Zero

All forms of energy have units of _________.

Joules

What are the units for work?

Joules

_______ energy is the energy of an object in motion.

Kinetic

Which of the following forces opposes an object that is in motion?

Kinetic Friction

Gravitational Potential Energy is directly proportional to _______.

Mass, Gravity, and Height

________ is defined as the product of the mass of an object multiplied by its velocity.

Momentum

torque is measured in what SI units?

N*m

What are the units for force?

Newtons

The coefficient of friction shows us the relationship between friction and what other force?

Normal Force

Which of the following forces is always perpendicular to the contact surface?

Normal Force

Work can only be done by forces that are _______ to the direction of motion.

Parallel

In which of the following collisions do the objects stick together after they collide?

Perfectly Inelastic

If the velocity of an object is negative and it is slowing down, then its acceleration must be __________.

Positive

If the velocity of an object is positive and it is speeding up, then its acceleration must be __________.

Positive

The rate at which work is done is referred to as _________.

Power

The sum of two vectors is referred to as the __________.

Resultant

Which of the following quantities gives us magnitude ONLY?

Schalar

Which of the following forces keeps an object from going into motion?

Static Friction

Which of the following fundamental forces is the strongest?

Strong Nuclear Force

Which of the following fundamental forces have very short ranges?

Strong Nuclear Force and Weak Nuclear Force

The statement below describes which of Newton's Laws? "Objects at rest wish to remain at rest, objects in motion wish to remain in motion at constant velocity unless acted on by an outside force."

The First Law

What must be true if the net work on an object is positive?

The Object is Speeding Up

The statement below describes which of Newton's Laws? "The net force on an object is directly proportional to the object's acceleration and mass."

The Second Law

The statement below describes which of Newton's Laws? "For every action there is an equal and opposite reaction."

The Third Law

Which of the following quantities gives us BOTH magnitude and direction?

Vector

Acceleration is defined as the change in ________ over a time interval.

Velocity

The slope of a position v. time graph gives us _____________.

Velocity

What are the units for power?

Watts

__________ is the measurement of the effect that gravitational force has on an object.

Weight

______ is defined as the magnitude of the force on an object multiplied by the object's displacement.

Work

If the velocity of an object is constant then its acceleration must be ___________.

Zero

What is true about a falling object when it reaches terminal velocity?

air resistance is equal and opposite to the object's weight

Which of the following is always directed towards the center of circular motion?

both centripetal acceleration and centripetal force

Which of the following is caused by a constant change in direction for an object in circular motion?

centripetal acceleration

What always causes a centripetal acceleration?

centripetal force

Positive torque means the object is rotating in which direction?

counter-clockwise

Newton's Law of Universal Gravitation says that the force of gravity between two objects is inversely proportional to __________.

distance between two objects

What is the centripetal force that keeps the moon in motion around the Earth?

gravity

Mechanical advantage measures how a machine multiples the ______.

input force

What is true for an object in free-fall?

its acceleration is 10 m/s2

What are the units for impulse?

kg*m/s

What are the units for momentum?

kg*m/s

What are the SI units for velocity?

m/s

Newton's Law of Universal Gravitation says that the force of gravity between two objects is directly proportional to __________.

mass of both objects

What affects the Earth's tides the most?

moon's gravity

Less extreme than normal tides are referred to as ______.

neap tides

What type of tides do we get when the Earth, moon and sun are at a right angle to each other?

neap tides

Torque can only be applied by forces that are ________ to the lever arm.

perpendicular

Elastic Potential Energy is directly proportional to _______.

spring constant and distance the spring is stretched

More extreme than normal tides are referred to as ______.

spring tides

What type of tides do we get when the Earth, moon and sun all line up?

spring tides

What must be true if the net work on an object is negative?

the object is slowing down

The ability of a force to rotate an object is referred to as __________.

torque