4.8 Mid-Unit Assessment Review

Which statement best describes a projectile on Earth?

• The acceleration in the ‘y’ is always 9.8 m/s².

• The acceleration in the ‘x’ is always 9.8 m/s².

• The acceleration in the ‘x’ is always -9.8 m/s².

• The acceleration in the ‘y’ is always -9.8 m/s².

Neglecting air resistance, firing a projectile at an angle of ________ degrees will allow it to have the greatest horizontal displacement (range)

• 45

• 60

• 90

• 30

The x-velocity of a horizontal projectile is always _____________.

• Zero

• Constant

• Accelerating

• Changing

The initial y-velocity of a horizontal projectile is always _____________.

• Accelerating

• Constant

• Zero

• Changing

If Troy Aikman throws a football with a velocity of 22.0 m/s at an angle of _______ and it lands in the endzone, ______would also give the same exact result assuming he throws it with the same initial speed.

• 60 and 30 degrees

• 45 and 90 degrees

• 30 and 90 degrees

• 55 and 35 degrees

When an object is fired into the air at an angle, its path forms the shape of a __________.

• Line

• Parabola

• Polynomial

• Sine Function

If you want to throw a ball in the air and keep it in the air for the longest possible amount of time you should throw it…

• Parallel to the ground

• At an angle of 45 degrees

• At an angle of 60 degrees

• Straight up in the air

A ball is thrown into the air at some angle less than 90.0 degrees (not zero). At the top of the ball’s trajectory (peak of path), it has non-zero velocity

• Only in the horizontal (x-direction)

• Only in the vertical (y-direction)

• In the verticl and horizontal

• Zero in the vertical and horizontal

A ball will rise to the greatest height if it is thrown at an angle of

• 45 degrees

• 75 degrees

• 90 degrees

• 0 degrees

A soccer ball _________ is not a projectile.

• Fired straight up

• At an angle into the air

• Rolling down a slope

• That has just rolled off the edge of a table