Physics Momentum and Kinetic Energy Quiz

<p>Directly proportional (D)</p> Signup and view all the answers

<p>A change in direction (A), A constant acceleration (C)</p> Signup and view all the answers

<p>10 kg*m/s (D)</p> Signup and view all the answers

<p>It quadruples (A)</p> Signup and view all the answers

<p>Momentum is a vector quantity. (B)</p> Signup and view all the answers

<p>-0.0250 m/s (B)</p> Signup and view all the answers

<p>-0.0467 m/s (A)</p> Signup and view all the answers

<p>1560 m/s^2 (D)</p> Signup and view all the answers

<p>0.0320 s (C)</p> Signup and view all the answers

<p>m1 v1i = (m1 - m2) v1f + m2 v2f cos θ (D)</p> Signup and view all the answers

<p>0.0250 m/s (B)</p> Signup and view all the answers

<p>50 m/s (B)</p> Signup and view all the answers

<p>30 degrees (C)</p> Signup and view all the answers

<p>They are equal in magnitude and opposite in direction. (A)</p> Signup and view all the answers

<p>It describes the conservation of momentum during a collision (A)</p> Signup and view all the answers

<p>The change in momentum of an object is equal to the average force acting on it multiplied by the time interval over which the force acts. (C)</p> Signup and view all the answers

<p>The system is not subject to any external forces. (B)</p> Signup and view all the answers

<p>The change in velocity of the lighter object is greater than that of the heavier object. (A)</p> Signup and view all the answers

<p>The initial velocity of m1 (C)</p> Signup and view all the answers

<p>The collision is a head-on collision (D)</p> Signup and view all the answers

<p>To ensure that the system is not subject to any external forces (C)</p> Signup and view all the answers

<p>The product of force and time interval (D)</p> Signup and view all the answers

<p>Always true, regardless of the force or time interval (B)</p> Signup and view all the answers

<p>Kilogram-meter per second (kg·m/s) (A), Newton-second (N·s) (D)</p> Signup and view all the answers

<p>The force that delivers the same impulse to the object in the time interval Δt as the actual time-varying force (D)</p> Signup and view all the answers

<p>Impulse is directly proportional to the change in momentum. (B)</p> Signup and view all the answers

<p>The momentum will increase. (B)</p> Signup and view all the answers

<p>The momentum is constant. (B)</p> Signup and view all the answers

<p>The color of the object (C)</p> Signup and view all the answers

<p>4.00 × 10³ kg (C)</p> Signup and view all the answers

<p>All of the above. (D)</p> Signup and view all the answers

<p>3.75 × 10⁴ kg m/s (D)</p> Signup and view all the answers

<p>The initial momentum of the car in the x-direction. (B)</p> Signup and view all the answers

<p>The collision occurs in a vacuum with no air resistance. (B)</p> Signup and view all the answers

<p>Kinetic energy (B)</p> Signup and view all the answers

<p>The final momentum is equal to the vector sum of the initial momenta of the car and truck. (A)</p> Signup and view all the answers

<p>It remains constant. (C)</p> Signup and view all the answers

<p>A collision where the objects collide at a non-zero angle. (A)</p> Signup and view all the answers

<p>Initial velocity. (B)</p> Signup and view all the answers

<p>4 (B)</p> Signup and view all the answers

<p>Conservation of kinetic energy. (C)</p> Signup and view all the answers

<p>It means the initial vertical component of momentum is zero. (B)</p> Signup and view all the answers

<p>Both momentum and kinetic energy. (C)</p> Signup and view all the answers

<p>The analysis of glancing collisions can be simplified by considering the motion only in two dimensions. (B)</p> Signup and view all the answers

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Momentum in Cartesian coordinates: px = mvx, py = mvy, pz = mvz

Magnitude of momentum is given by p = √(px² + py² + pz²)

Kinetic energy EK relates to momentum as EK = p²/(2m)

Momentum is measured in kg m/s in SI units.

Newton's second law gives net force as F_net = Δp/Δt.

Momentum is conserved when net force F_net = 0.

The change in momentum Δp over time Δt equals the net force F_net.

Momentum in directions: px, py, pz relates to velocity components vx, vy, vz.

The product of force and the time interval during which it acts.

States that the impulse on an object equals its change in momentum.

The product of an object's mass and its velocity.

A quantity that has both magnitude and direction.

A force that does not change in magnitude or direction during the time interval.

The constant force that delivers the same impulse as a variable force over a time interval.

The duration during which a force is applied.

Finding the impulse by multiplying the average force by the duration of the collision.

F21 and F12 are forces during a collision, equal and opposite.

Total momentum before and after a collision is constant.

Average forces F21 and F12 account for changing forces over time.

Change of velocity in lighter vs. heavier particles differs.

For every action, there's an equal and opposite reaction force.

An isolated system does not exchange energy or matter.

The equation 0 = m1v1f + m2v2f represents final momentum.

Using m1 = 59.97 kg, m2 = 0.030 kg, v2f = 50.0 m/s in momentum calculations.

The final velocity of archer after firing is v1f = v1i - (m2v2fcosθ)/(m1-m2).

Angle θ is the direction the second arrow is fired, affecting momentum.

Acceleration a is calculated using a = (v2 - v20) / (2*Δx).

Acceleration can be estimated as a = (50 m/s)² / (2*0.800 m).

The time for acceleration calculated as t = (v - v0) / a.

Average normal force is related to acceleration of the arrow by the bowstring.

Collisions that occur in a plane, involving two objects.

m1 * v1i + 0 = m1 * v1f cos(θ) + m2 * v2f cos(φ)

0 + 0 = m1 * v1f sin(θ) + m2 * v2f sin(φ)

A collision where both momentum and kinetic energy are conserved.

In collisions, variables such as v1f, v2f, θ, and φ are often unknowns.

The angle at which the first object moves after a collision.

The angle at which the second object moves after a collision.

Collisions can be elastic or inelastic, affecting energy conservation.

A collision where two objects stick together after impact.

Total momentum before collision equals total momentum after collision.

In inelastic collisions, kinetic energy is not conserved.

Calculate initial momentum by summing object momenta before collision.

Final velocity after a perfectly inelastic collision is based on combined mass.

Assuming no friction simplifies momentum calculations during collisions.