Unit 1 and 2 Concepts Review

A cannonball is fired from ground at an angle over horizontal ground. During the flight of the cannon ball the magnitude of the cannon ball’s acceleration-

• Remains the same

• Decreases and then increases

• Increases and then decreases

• Increases during the entire flight

Tags

NGSS.HS-PS2-1

A cannonball is fired from ground at an angle over horizontal ground. During the flight of the cannon ball the magnitude of the vertical component of the cannon ball’s velocity

• Remains the same

• Decreases and then increases

• Increases and then decreases

• Decreases during the entire flight

A ball rolls off a table 1.5 m high and falls to the ground. Which statement correctly describes its motion as it falls to the ground?

• Its horizontal and its vertical speed increase.

• Its horizontal and its vertical speed do not change.

• Its horizontal speed increases but its vertical speed does not change.

• Its horizontal speed does not change but its vertical speed increases.

Tags

NGSS.HS-PS2-1

An object that is launched from the top of a tall tower has initial velocity has components (v_x = 30 m/s, v_y = 20 m/s). Ignore the effects of air resistance. What are the components of the object's velocity 3 seconds after launch?

• v_x = 0 m/s, v_y = -10 m/s

• v_x = 0 m/s, v_y = 20 m/s

• v_x = 30 m/s, v_y = -10 m/s

• v_x = 30 m/s, v_y = 50 m/s

Tags

NGSS.HS-PS2-1

A ball is launched from ground level with an initial velocity of 10 m/s (vx = 6 m/s, vy = 8 m/s). The ball travels over level ground. Ignore the effects of air resistance. What is the overall speed of the ball when it reaches the highest point in its trajectory?

• 0 m/s

• 6 m/s

• 8 m/s

• 10 m/s

Tags

NGSS.HS-PS3-2

A ball is launched from ground level with an initial velocity of 10 m/s (vx = 6 m/s, vy = 8 m/s). The ball travels over level ground. Ignore the effects of air resistance. What is the overall speed of the ball just before striking the ground?

• 0 m/s

• 6 m/s

• 8 m/s

• 10 m/s

From the top of a bridge 5 meters high, a dense ball is shot horizontally such that its initial velocity is 20 m/s. The ball travels a horizontal distance D in time T before hitting the ground. If the initial velocity of the ball is doubled to 40 m/s, how will this new air time and horizontal distance for this launch compare to the original launch?

• Time in Air = 2T; Horizontal Distance = 2D

• Time in Air = T; Horizontal Distance = 2D

• Time in Air = T; Horizontal Distance = D

• Time in Air = 2T; Horizontal Distance = D

If the ball is shot from a bridge that is 20 m high at the original speed (20 m/s), how will this new air time and horizontal distance for this launch compare to the original launch?

• 10 m/s

• 30 m/s

• 60 m/s

• 90 m/s

Tags

NGSS.HS-PS2-1

When is the runner running backwards (in a negative direction)?

• Between 80-104 seconds

• Between 104-110 seconds

• Between 80-110 seconds

• Between 110-130 seconds

When is the runner moving with the fastest speed?

• Between 0-70 seconds

• Between 70-80 seconds

• Between 80-110 seconds

• Between 110-130 seconds