Physics: Chapter 3 & 4

When an object moves in uniform circular motion, the direction of its acceleration is

Is directed toward the center of its circular path

A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will

Be directly over the package

A player kicks a soccer ball in a high arc towards the opponent's goal. At the highest point in its trajectory

Neither the ball's velocity nor its acceleration are zero

A girl attaches a rock to a string, which she then swings counter-clockwise in a horizontal circle. The string breaks at point P in the figure, which shows a bird's-eye view (as seen from above). Which path (A-E) will the rock follow?

Path B

For general projectile motion with no air resistance, the horizontal component of a projectile's velocity

Remains a non-zero constant

A ball is thrown horizontally from the top of a tower at the same instant that a stone is dropped vertically. Which object is traveling faster when it hits the level ground below if neither of them experience an air resistance?

The ball

Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance?

The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward

An object is moving with constant non-zero velocity. Which of the following statements about it must be true?

The net force on the object is zero

If you pound a feather with a hammer, which one feels greater force?

The size of the force is always exactly the same on both of them

You are rowing your boat in order to cross a river with a fast moving current. You point your boat directly due north towards a point directly across from you on the other shore and begin to row 4m/s. If the current in the river is 3m/s due east, you will

Travel at 5m/s with respect to the shore, at an angle east of north