Physics Unit 4 Quiz

An object is thrown horizontally from the top of a building. Which of the following statements about its motion is correct (ignoring air resistance)?

• The vertical motion affects the horizontal motion.

• The horizontal velocity increases as the object falls.

• The object's speed remains constant throughout its flight.

• The time it takes to hit the ground depends only on the height of the building.

A student drops a ball from a window while a second student throws an identical ball horizontally from the same window at the same time. Which ball hits the ground first (ignoring air resistance)?

• The ball that was dropped.

• The ball that was thrown horizontally.

• The ball with the greater mass.

• They both hit the ground at the same time.

A ball is launched from a catapult. What is the direction of the acceleration of the ball at the highest point of its trajectory?

• Forward, in the horizontal direction.

• There is no acceleration at the highest point.

• Upward, in the vertical direction.

• Downward, towards the ground.

A skateboarder rolls off a ramp at a constant horizontal speed. What happens to the vertical velocity of the skateboarder after they leave the ramp?

• It remains constant because the horizontal speed is constant.

• It becomes zero and stays zero.

• It increases in the downward direction.

• It decreases in the downward direction.

Which of the following statements about a projectile's motion is always true?

• The projectile's horizontal velocity is always zero.

• The projectile's speed is constant.

• The vertical and horizontal motions are independent.

• The acceleration of the projectile is always zero.

A plane flying horizontally at a constant velocity drops a relief package. The pilot then immediately sees the package land on the ground. Where is the plane relative to the package when it lands (ignoring air resistance)?

• The plane is behind the package.

• The plane is directly above the package.

• The plane is ahead of the package.

• The plane's position relative to the package cannot be determined.

A coin is flicked horizontally off a table. Which of the following statements about its velocity is true just before it hits the ground?

• Both its horizontal and vertical velocity are zero.

• It has a vertical velocity but no horizontal velocity.

• It has both a horizontal and vertical velocity.

• Its velocity is the same as its initial horizontal launch velocity.

A ball takes 0.5 s to fall to the floor from a horizontal launch. What is the height of the launch point? Use g=10 m/s².

• 1.25 m

• 2.5 m

• 5.0 m

• 0.5 m

An object is launched horizontally from a cliff. If the object lands 10 m from the base of the cliff after a flight time of 2 s, what was the object's initial horizontal velocity?

• 20 m/s

• 5 m/s

• 10 m/s

• 2 m/s

A coin is flicked horizontally from a table that is 1.25 m high. What is the time it takes for the coin to hit the floor? Use g=10 m/s².

• 0.5 s

• 2.5 s

• 0.25 s

• 1.0 s