Free Fall

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by 

• about 5 m/s.
• about 9.8 m/s.

• about 15 m/s.
• a rate that depends on its initial speed.

What is the velocity of a ball that has been dropped off a cliff after 1 , 2, 3, 4, and 5 seconds? (assume g is rounded to 10 m/s²)?. 

• 10, 20, 30, 40, 50 m/s
• 5, 10, 15, 20, 25 m/s
• 5, 20, 45, 80,125 m
• 10,10,10,10,10 m/s

Free fall is any motion of a body where ____ is the only force acting upon it.

• body attraction

• tension

• gravity

• velocity

Two rocks with different size and mass are dropped from the same height. Which of the rock will reach the ground first?

• greater rock

• smaller rock

• both reach the ground at the same time

If an object is in free fall for three seconds, how fast will it be falling at the end of its motion?

vf= gt

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

• 39.2 m/s

A pumpkin is dropped from a 35 m building. What is its initial velocity (v_i)?

• 9.8 m/s²
• 35 m
• 0 m/s
• 9.8 m/s

An object falls from a high building. Ignoring air resistance, what will its velocity be after 6 seconds of falling?

vf=gt

• 9.8 m/s

• 58.8 m/s

• 6 m/s

• 8 m/s

TRUE or FALSE:

A ball is thrown upwards and is rising towards its peak. As it rises upwards, it is NOT considered to be in a state of free fall.

• TRUE

• FALSE

TRUE or FALSE:

An object in free fall experiences an acceleration which is independent of the mass of the object.

• TRUE

• FALSE

 

TRUE or FALSE:

A ball is thrown upwards, rises to its peak and eventually falls back to the original height. As the ball rises, its acceleration is upwards; as it falls, its acceleration is downwards.

• TRUE

• FALSE