Chapter 2 for Phy-32

Acceleration may result from what?

an increase in speed, a decrease in speed, a change in direction

An object is projected straight upward. Neglecting air resistance, it _____.

has a constant acceleration throughout, has zero velocity at the top of the projection, returns with the same initial speed

What is necessary to designate a position?

reference point

A football is thrown on a long pass. Compared to the ball's initial horizontal velocity, the velocity at the highest point is ___. (Ignore the air resistance.)

the same

For a constant linear acceleration, what changes uniformly?

velocity

In the absence of air resistance, a projectile launched at an angle of 33° above the horizontal will have the same range as a projectile launched at which of the following angles?

57 degrees

If the speed of an object in uniform circular motion is tripled and the radial distance remains constant, then the magnitude of the centripetal acceleration increases by what factor?

9

Neglecting air resistance, which of the following is true for a ball thrown at an angle to the horizontal?

It has a constant velocity in the x direction, It has a constant acceleration in the −y direction, It has a changing velocity in the +y direction

What describes an object in motion?

It is continuously changing position.

Which one of the following is always true about the magnitude of a displacement?

It is less than or equal to the distance traveled

Which is true of an object with uniform velocity?

It travels equal distances in equal times, It has constant speed and It has constant direction.

Which one of the following is true for a deceleration?

The acceleration is in the direction opposite to the velocity.