Unit 3 Physics: Two dimensional motion

Unit 3

By Aris Ventura-Peralta

Trig Intro

Multiple Choice

What is  diagonal vector?

• Opposite

• Adjacent

• Hypotenuse

Multiple Choice

What is the X component?

• Adjacent

• Opposite

• Hypotenuse

Multiple Choice

What is the y component?

• Opposite

• Adjacent

• Hypotenuse

Projectiles

Multiple Choice

 X and Y components of velocity DO NOT affect each other. 

• False
• True

Multiple Choice

Everything has a x and y component expect...?

• velocity

• acceleration

• Time

• Displacement

Multiple Choice

What is projectile motion?

• Projectile motion is a special kind of movement when the only acceleration is from gravity.

• Projectile motion is the vertical drop of an object under constant acceleration without any initial velocity.
• Projectile motion refers to the constant speed of an object moving horizontally.
• Projectile motion is the straight-line movement of an object without any forces acting on it.

Multiple Choice

 projectiles reach their highest point when their Vf=0

• False

• True

Multiple Choice

Whenever a problem says that an object reaches a maximum height, you know that Vfy=1m/s. 

• False

• True

Multiple Choice

Projectile motion has no x acceleration!

• True

• False

Multiple Choice

Does the velocities of x's are not the same when it comes to projectiles?

• True

• False

Rotation

Multiple Choice

When a force pulls something what happens?

• The object rotates around a point.
• The object moves away from the force.
• The object moves and creates a right angle, it also changes direction

• The object remains stationary.

Multiple Choice

What is the name of the force of an object that is being pulled to the center?

• Magnetic force
• Frictional force
• centripetal force

• Centrifugal force

Multiple Choice

A force pointing away from the center is called?

• Centrifugal force
• Magnetic force
• Gravitational force
• Centripetal force

Multiple Choice

ROTATING OBJECTS DO NOT EXPERIENCE A CENTRIFUGAL NET FORCE

• True

• False

Multiple Choice

What are the two rotational factors?

• 1: Momentum and 2: kinetic energy

• 1: The distance from the center of rotation. 

  2: how fast an object is rotating. We call this “angular speed”

• Centripetal force and torque
• Linear speed and linear acceleration

Center of mass, Torque, Rotational inertia, 

Multiple Choice

The center of mass is the average location of the mass of an object. 

• True

• False

Multiple Choice

Define torque

• Torque is the measure of energy in a system, defined as E = F × d.
• the rotational version of force.

• Torque is the force that causes an object to move in a straight line, expressed as F = m × a.
• Torque is the product of mass and velocity, calculated as p = m × v.

Multiple Choice

What are the two factors that help increase torque?

• Increasing mass and decreasing lever arm distance.
• Increasing the strength of the push and how far from the center of mass the push is

• Decreasing force and increasing lever arm distance.
• Increasing speed and increasing friction.

Multiple Choice

The closer the force is to the center of mass, the more its velocity change and the less its angular speed changes

• True

• False

Multiple Choice

What is Rotational Inertia?

• Rotational inertia refers to the force applied to an object in motion.
• Rotational inertia is how hard an object is to rotate. 

• Rotational inertia measures the angular velocity of a rotating body.
• Rotational inertia is the speed of an object in circular motion.

Multiple Choice

More mass, more rotational inertia?

• True

• False

Multiple Choice

The more spread out something is, the less rotational inertia it has

• False

• True

Angular momentum, Conservation of angular momentum

Multiple Choice

What is Angular momentum?

• Angular momentum is the force acting on an object in motion.
• Angular momentum is the energy stored in a rotating object.
• Angular momentum is the speed of an object moving in a straight line.
• Angular momentum is how hard an object is to stop spinning. 

Multiple Choice

What two objects have more angular momentum

• A spinning chair and a massive car doing donuts

• A rotating galaxy and a falling leaf
• A spinning top and a moving car
• A drifting asteroid and a stationary black hole

Multiple Choice

Angular momentum CAN BE CREATED OR DESTROYED

• True

• False

Multiple Choice

When something ______ its rotational inertia, its rotational speed _______.

• decreases; increases
• increases; remains the same
• increases; decreases
• remains the same; increases

Multiple Choice

When something _______ its rotational inertia, its rotational speed ______.

• increases, decreases
• fluctuates, stabilizes
• remains constant, accelerates
• decreases, increases