Free Fall Review Questions

What does it mean for an object to be in free fall?

• Only air resistance acting on the object.

• Gravity is the only force acting on the obejct.

• Any object that is in downward motion.

Tags

NGSS.MS-PS2-4

Do free falling objects move at constant velocity or do they accelerate?

• Falling objects accelerate at -9.8 m/s²
• Falling object move at constant velocity
• Falling objects accelerate at 100 m/s²
• It depends on the mass: heavy objects accelerate, light objects do not

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

In a normal environment, why does a bowling ball and feather hit the ground at different times when dropped from the same height?

• They don't; they hit the ground at the same time.
• One is more dense than the other.
• One is heavier than the other.
• Air resistance 

If you throw a baseball straight up (Level II), what is its velocity at the highest point?

• 9.8 m/s²

• 9.8 m/s

• 0 m/s²

• 0 m/s

What values are always known for a object that is dropped from a height (Level I)?

• v_o = 0 m/s

  a = -9.8 m/s²

• v_o = -9.8 m/s

  a = -9.8 m/s²

• v_o = -9.8 m/s

  a = 0 m/s²

• d = -9.8 m

  v_o = 0 m/s

What happens to the total distance  that a ball travels as it falls off the side of a cliff?

• The distance remains constant 
• The distance increases at a uniform rate
• The distance increases at a nonuniform rate 
• The distance decreases at a uniform rate

Tags

NGSS.HS-PS2-4

What happens to the speed of a ball as it is dropped off a cliff?

• It decreases at a uniform rate

• It increases at a uniform rate

• It is constant

• It increases at a non-uniform rate

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.HS-PS2-2

The time that it takes a material shot directly upward to reach its peak of flight is __________ compared to the time it takes for it to return to the ground.

• greater than

• the same as

• less than

• unpredictable

When an object moves rightward and speeds up, the direction of its acceleration is

• rightward

• leftward

• There is no acceleration.