question

True

answer

It is possible to multiply a vector by a scalar.

question

True

answer

A 2D vector can have a component equal to zero even when its magnitude is nonzero.

question

True

answer

The components of a vector can be different in different coordinate systems.

question

False

answer

A 2D vector can have a magnitude equal to zero even when one of its components it nonzero.

question

False

answer

The magnitude of a vector can be different in different coordinate systems.

question

False

answer

It is possible to add a scalar to a vector.

question

False

answer

The direction of a vector can be different in different coordinate systems.

question

False

answer

If V3=V1+V2, then V3=V1+V2.

question

False

answer

If V3=V1+V2, then V3V1.

question

True

answer

If V3=V1+V2, then V4=3V1+3V2 is parallel to V3.

question

True

answer

If V3=V1+V2, then V3−V2 is parallel to V1.

question

Decreases

answer

If the wall were slightly farther from where the projectile was launched (the projectile still hits it), how would that effect the following?The distance from the ground to where the projectile hit the wall.

question

Stays the same

answer

If the wall were slightly farther from where the projectile was launched (the projectile still hits it), how would that effect the following?The maximum height of the projectile.

question

Stays the same

answer

If the wall were slightly farther from where the projectile was launched (the projectile still hits it), how would that effect the following?The magnitude of the x component of the velocity of the projectile when it hits the wall.

question

Increases

answer

If the wall were slightly farther from where the projectile was launched (the projectile still hits it), how would that effect the following?The magnitude of the y component of the velocity of the projectile when it hits the wall.

question

Increases

answer

If the wall were slightly farther from where the projectile was launched (the projectile still hits it), how would that effect the following?The speed of the projectile when it hits the wall.

question

False

answer

If the average velocity of an object is zero, then the average speed of the object must also be zero.

question

True

answer

If the initial velocity of an object is zero, then the initial speed of the object must be zero.

question

False

answer

If the initial speed of an object is zero, then the initial position of the object must be the origin.

question

False

answer

If the velocity of an object is zero, then the acceleration of an object must also be zero.

question

True

answer

The acceleration of an object can be non-zero when the speed of the object is constant.

question

False

answer

The average speed of an object is always equal to the magnitude of the average velocity of the object.

question

True

answer

If the acceleration of an object is zero, then the average speed must be equal to the magnitude of the average velocity for the object.

question

True

answer

The speed of an object can never be negative.

question

True

answer

The velocity of an object can reverse direction when the acceleration of the object is constant.

question

False

answer

If an object moves in one dimension with a positive component of acceleration, its speed must be increasing.

question

The average acceleration is zero

answer

A car is initially traveling east through New York City at 10 mph. As the car approaches an intersection it stops and turns left to go north. After traveling one block north the car stops and turns right to once again head east. At the final time the car is traveling east at 10 mph. In what direction is the average acceleration of the car as a result of the motion described above?NorthEastNortheastThe average acceleration is zero

question

mass or temperature

answer

physical quantity not described as a vector?

question

none makes sense

answer

V3 = V1 + V2 What is true about V3?a) V3>0b) V3<0c) V3 = 0d) not enough informatione) none makes sense

question

b) V3 < V1 + V2

answer

What is true about V3 = V1 + V2 ?a) V3> V1 + V2b) V3 < V1 + V2c) V3 = V1 + V2d) not enough info

question

a) V4x > 0 ; V4y > 0

answer

Which is true? V4 = V1 + V2a) V4x > 0 ; V4y > 0b) V4x > 0 ; V4y < 0c) V4x < 0 ; V4y > 0d) V4x < 0 ; V4y < 0e) not enough info

question

b) V5 = 7sqrt2

answer

What is true about V5 = -V1 + V2a) V5 = 14b) V5 = 7sqrt2c) V5 = 10d) V5 = 5sqrt2e) V5 = -14

question

DONT

answer

Vertical components of the velocity (do, dont) depend on one another

question

magnitude

answer

Size of any vector is

question

unit vector

answer

A ____________ is a vector whose magnitude is 1 and is indicated with a hat.

question

Average of Magnitude of Velocity

answer

Which is equivalent to speed?Magnitude of Average VelocityAverage of Magnitude of Velocity

question

dynamics

answer

What gives rise to changes in motion, or in other words.. acceleration?

question

pull

answer

tension forces can only ______ objects

question

contact forces

answer

When two objects directly touch one another, then they can exert _____________ on each other.

question

always

answer

The direction of kinetic friction ___________ opposes the direction of slipping.

question

Newton

answer

Si unit of Force

question

inertia

answer

resistance to such a change in motion is called

question

Kilogram (kg)

answer

Si unit of mass

question

net external force

answer

The sum of all external forces is called the ___________.

question

Newtons 1st Law

answer

To an inertial observer, an object that has no net external force acting on it will appear to move w a constant velocity.

question

Newtons 2nd Law

answer

To an inertial observer, the acceleration of the center of mass of a system (b) is equal to the net force acting on it divided by the inertial mass of the system.

question

Newtons 3rd Law

answer

If an object a exerts a force on object b, then object b must exert a force of the same form on object a, which is equal in magnitude and opposite in direction.