Physics Exam 1 Study Material

A red ball rolls off a table with a horizontal velocity of 5.1 m/s. Just as it leaves the table a blue ball is dropped from the same height as the table. Which one hits the ground first? There is no air resistance.

they reach the ground at the same time

In general projectile motion, what can be said about the horizontal component of the velocity, x?

Assume there is no air resistance.

it is constant throughout

How is 0.01123 correctly rewritten in scientific notation?

1.123x10^-2

If a car is moving at a steady speed of 65 mph on a straight level road, what direction is its acceleration?

there is no acceleration

As a ball rolls up a hill on Earth

the acceleration is down the hill

A soccer ball is kicked into the air toward the goal. What can be said about the velocity as it moves toward its highest point if air resistance is ignored.

Vx is constant and Vy decreases

How many sig figs are in 0.09040?

4

When an object experiences acceleration, the velocity is

changing magnitude and/or direction

A ball is thrown straight up into the air on Earth. At what point in the motion is the acceleration equal to zero?

the acceleration is never zero while it is in the air

A child is leaping through the air. While they are in the air (on Earth, no air resistance) what can be said about their vertical acceleration?

the acceleration is downward throughout

In a motion diagram, if the dots get closer together with increasing time the object is

moving with a decreasing speed

A ball is kicked from the ground into the air toward the end of a field. At its highest point

none of these are correct

A yellow ball and a purple ball are both thrown into the air with the same speed from the same height.

The yellow ball is thrown at 15° above the horizontal and the purple ball is thrown at 33° above the horizontal. Which one spends more time in the air?

the purple ball will be in the air longer

A GPS satellite orbits the Earth at a constant speed in a circular orbit. What direction is its acceleration?

toward the Earth

Which of the following is not a vector?

distance

Which is a list of scalars, not vectors?

distance, speed, time, mass

acceleration is

the change in velocity divided by the change in time

velocity is

the change in distance/displacement divided by time