Freefall Conceptual Questions

When applying the equations of kinematics for an object moving in one dimension, which of the following statements MUST be true?

• The velocity of the object must remain constant.

• The acceleration of the object must remain constant.

• The velocity of the object must increase with time.

• The position of the object must increase with time.

• The velocity of the object must always be in the same direction as its acceleration.

A juggler throws a bowling pin straight up in the air. After the pin leaves his hand and while it is in the air, which statement is true?

• The velocity of the pin is always in the same direction as its acceleration.

• The velocity of the pin is never in the same direction as its acceleration.

• The acceleration of the pin is zero.

• The velocity of the pin is opposite to its acceleration on the way up.

• The velocity of the pin is in the same direction as its acceleration on the way up.

Tags

NGSS.HS-PS2-1

A racing car starts form rest and reaches a final speed V in a time T. If the acceleration of the car is constant during this time, which of the following statements must be true?

• The car travels a distance VT

• The average speed of the car is V/2

• The acceleration of the car is V/T

• The velocity of the car remains constant

• None of these

Tags

NGSS.HS-PS2-1

A pebble is dropped from rest from the top of a tall cliff and falls 5.0 m after 1.0 s has elapsed. How much farther does it drop when t = 2.0 s?

• 10 m

• 20 m

• 45 m

• 80 m

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

An object moves along the x-axis, its positon measured at each instant of time. The data are organized into an accurate graph of X versus T. Which of the following quantities CANNOT be obtained from this graph?

• The velocity at any instant

• The acceleration at any instant

• The displacement during some time interval

• The average velocity during some time interval

• The speed of the particle at any instant

A student at the top of a building throws a red ball upward with speed Vo and then throws a blue ball downward with the same initial speed Vo. Immediately before the two balls reach the ground, which of the following statements are true? Choose all that apply.

• The speed of the red ball is less than that of the blue ball.

• The speed of the red ball is greater than that of the blue ball.

• Their velocities are equal.

• The speed of each ball is greater than that of the red ball.

A ball is thrown straight up in the air. For which situation are both the instantaneous velocity and the acceleration zero?

• On the way up

• At the top of the flight path

• On the way down

• Halfway up and halfway down

• None of these

The definition of Free Fall is falling under the influence of gravity alone, air resistance is neglected.

• True

• False