Physics Quiz

----

----

At what angle should the kicker kick the football to sent it the furthest down the field?

45 degrees

At what point is the speed of the projectile a minimum?

at point C

Mario jumps to reach a question block. At what point or points of his jump is his speed the greatest?

at the beginning and end of his jump.

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

You push on a crate resting on a frictionless surface with a constant force. While pushing on the crate, it will

moving in the direction you push with a constant acceleration.

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

neither the balls velocity nor acceleration are zero

For general projectile with no air resistance, the horizontal component of a projectiles velocity

remain a non-zero constant

At what two points in the image do the objects have the same speed

B and D

In a collision between a huge SUV and a small hybrid car, the SUV exerts the large force.

False

In order to get an object moving, you must push harder on it than it pushes back on you.

False

The natural state of motion of objects is rest

False

When describing motion, you must choose a coordinate system at absolute rest.

False

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

Which is true about an object in 2D projectile motion with no air resistance?

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

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 a greater force?

The size of the force is always exactly the same.

In projectile motion, what applies to the motion in the x-direction?

Velocity is Constant, and there is no Force or Acceleration.

You would like to row your boat directly across a river with a strong current. To do so you should

angle your boat pointing against the direction of the current

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.

At the top of a projectiles motion, its acceleration is zero

false

You are swinging a bucket of water directly over your head as shown below. If the rope breaks at point P, the water will

follow path B

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

is directed toward the center of its circular path

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

is directed toward the center of its circular path.

A ball is thrown horizontally from the top of a tower are 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 experiences air resistance?

the ball

A car is traveling with a uniform speed around a circular track. If the car doubles its speed

the centripetal acceleration needed will quadruple

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

You are rowing your 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 at 4 m/s. If the current in the river is 3 m/s due east, you will

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