Uniformly Accelerated Motion (Free Fall)

Andi drops a rock from rest from a guard rail overlooking a valley. What is the velocity of the rock at 11s? the acceleration of gravity is 9.81 m.s^-2

• 107.81

• 1107.91

• 107.91

• 107.23

Tags

NGSS.HS-PS2-1

Suppose a tourist threw the rock with an initial velocity of 8.0 m/s (down). Determine the velocity at 4s. The acceleration of gravity is 9.81 m/s

• 31.14

• 32.14

• 32.24

• 31.24

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What is the characteristics of upward motion?

• there is initial velocity

• When an object reaches the highest point, its final velocity “v” will be zero

• the acceleration of gravity will be negative

• initial velocity 'u' = 0

In vertical motion, the acceleration will be the acceleration of gravity.

• False

• True

Tags

NGSS.HS-PS2-4

The rate at which velocity changes is called 

• motion
• average speed
• instantaneous speed
• acceleration

Tags

NGSS.HS-PS2-1

Acceleration of an object happens when things ________

• slow down
• go faster
• change direction (turn)
• All of the above

Tags

NGSS.HS-PS2-1

g is defined as

• the fastest that an object can fall
• acceleration of objects moving vertically
• acceleration caused by gravity
• the force of gravity on an object

Tags

NGSS.HS-PS2-4

How much time would it take for an object to fall 4.7 meters? (free fall, and use 9.8m/s² for g, not 10)

• 0.959 s
• 4.7 s
• 0.979 s

Tags

NGSS.HS-PS2-4

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be 

• less than the speed it had when thrown upwards.
• more than the speed it had when thrown upwards.
• the same as the speed it had when thrown upwards.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

If you drop a feather and a coin at the same time in a tube filled with air, which will reach the bottom of the tube first?

• the feather
• neither
• the coin