Projectile Motion, Impulse and Momentum, WPE

Consider a plane moving with a constant speed at an elevated height above the Earth’s surface. In the course of its flight, the plane drops a package from its luggage compartment. Where will it land with respect to the plane?

• behind the plane

• directly below the plane

• in front of the plane

• none of these

What do you call the path of the projectile?

• range

• trajectory

• maximum height

• hyperbola

At what angle should an object be fired to get the maximum range?

Which quantity is NOT negative when an object is dropped from a cliff?

• time

• velocity

• displacement

• acceleration

An object is launched straight up into the air. When it reaches its maximum height, its velocity is ____.

• equal

• zero

• equal to the product of displacement and time

• equal to the quotient of displacement and time

A paper ball is thrown horizontally from the table. How will you describe the ball’s horizontal and vertical velocity at the start?

• constant vertical and zero horizontal motion

• constant horizontal and zero vertical velocity

• constant vertical and horizontal velocity

• zero vertical and horizontal velocity

What quantities affect the momentum of an object? Check all that applies.

• mass

• velocity

• temperature

• length

A person lightly hits himself on a slowly moving car. Compared to the change in momentum of the car, the change in momentum of the person is __________.

• larger

• smaller

• equal to that of the car

When a coaster car falls, the _______.

• potential energy increases

• kinetic energy decreases

• kinetic energy decreases and potential energy increases

• kinetic energy increases and potential energy decreases

An object during its trajectory maintains a constant horizontal component. Why is this so?

• The net force acting on the object is zero.

• The object is not acted upon by any force.

• The object is not acted upon by a force in the horizontal direction.

• none of these