projectiles

Two identical balls X and Y are projected horizontally from the edge of a cliff. The path taken by each ball is shown. Identify which of the following statements about the motion of the balls is/are correct. I they take the same time to reach sea level. II they have the same vertical acceleration. III they have the same horizontal velocity.

• I only

• II only

• I and II only

• II and III only

A ball rolls down a runway and leaves it at point R. The horizontal speed of the ball at R is 1∙2 ms-1 . The ball takes 0∙4 s to travel from R to T. Calculate the distance from S to T.

• 0.33m

• 0.48m

• 3.0m

• 4.8m

• 12m

A ball is released from point Q on a curved runway, leaves the runway horizontally at R and lands 1 s later. The ball is now released from point P. Identify which row describes the motion of the ball after leaving the runway.

• time to land is 1 s and it will land less than 2 m away

• time to land is less than 1 second and it will land more than 2 m away

• time to land is 1 second and it will land more than 2 m away

• time to land is less than 1 s and it will land 2 m away

• time to land is more than 1 s and it will land more then 2 m away

A ball is thrown horizontally from a cliff as shown. The effect of air resistance is negligible. Identify which of the following statements about the ball is/are correct. I the vertical velocity of the ball increases as it falls. II the vertical acceleration of the ball increases as it falls. III the vertical force on the ball increases as it falls.

• I only

• II only

• I and II only

• I and III only

• I, II and III

A package is released from a helicopter flying horizontally at a constant velocity of 40 ms-1 . The package takes 3∙06 s to reach the ground. The effects of air resistance can be ignored. Identify which row in the table shows the horizontal velocity and vertical velocity of the package just before it hits the ground.

• horizontal velocity=0 vertical velocity=30

• horizontal velocity=30 vertical velocity=30

• horizontal velocity=30 vertical velocity=40

• horizontal velocity=40 vertical velocity=30

• horizontal velocity=40 vertical velocity=40

A seagull is flying horizontally at a speed of 8∙0 ms-1 . The seagull drops a piece of food which hits the ground 2∙5 s later. Identify which row in the table shows the horizontal velocity, vertical velocity and horizontal displacement of the package just before it hits the ground.

• A

• B

• C

• D

• E

A ball is projected horizontally with a velocity of 1·5 ms −1 from a cliff as shown. The ball hits the ground 1·22 s after it leaves the cliff. The effects of air resistance are negligible. Identify which row in the table shows the horizontal velocity, vertical velocity and the vertical displacement of the ball just before it hits the ground.

• A

• B

• C

• `D

• E

Mark all true statements

• A projectile is a free-falling object.

• A projectile has no air resistance.

• A projectile MUST be moving in a downward direction.

• A projectile HAS to have a horizontal velocity.

• A projectile has a downward acceleration due to gravity

Mark all of the following objects that are actually projectiles.

• An object moving through the air and not touching any surfaces

• A falling skydiver with an open parachute

• Any object falling with no air resistance

• A football kicked toward the goal posts

• An airplane flying through the air

Tags

NGSS.MS-PS3-1

Which of the following statements are TRUE about the horizontal motion of a projectile?

• Projectiles have a constant horizontal velocity.

• Projectiles have a constant non-zero horizontal acceleration.

• The horizontal velocity of a projectile is unaffected by the vertical velocity; these two components of motion are independent of each other.

• The final horizontal velocity of a projectile is always equal to the initial horizontal velocity.

• As a projectile rises towards the peak of its trajectory, the horizontal velocity will decrease.