Projectile Motion and Free Fall Quiz

What are the components of velocity and acceleration at the highest point of a projectile’s trajectory?

• Vertical velocity = 0; Horizontal velocity = 0; Vertical acceleration = 0

• Vertical velocity = 0; Horizontal velocity = constant; Vertical acceleration = 0

Why is there often a large percent error in measuring the free-fall time of an object in a physics lab?

• Air resistance increases the downward acceleration.

• The acceleration of the object is not uniform.

At what angle should a projectile be launched to achieve the maximum horizontal distance?

A child walks 4 m north, then 3 m east. What is the total displacement?

• 3 m

• 4 m

• 5 m

• 7 m

Which of the following statements are true about a ball’s motion when air resistance is present? - *I)* The ball's speed is zero at the highest point. - *II)* The ball's acceleration is zero at the highest point. - *III)* The ball takes longer to travel up than to fall down.

• I only

• II only

• I & II only

• I & III only

How far will an object in free fall travel during the next second if it has already fallen 45 m?

• 45 m

• 55 m

• 90 m

• 100 m

Two balls are dropped from the same height, but one is dropped 1 second later. What is the distance between them after 3 seconds?

• Decreases

• Remains constant

• Increases

• None of the above

• Same for all

• 5 m

• 10 m

• 25 m

• 50 m