Terminal Velocity/ Momentum

Question 1

What is terminal velocity?

Answer 1

The maximum speed of an object.

Question 2

How can terminal velocity be reached?

Answer 2

When the forces moving the object are balanced by its frictional forces.

Question 3

What are the 3 stages of an object falling through a fluid:

1. The object ____________________ due to the force of ________.
2. As the object’s speed increases, __________________ such as air resistance or drag ___________.
3. At ____________________, the weight of the object due to ____________ is ______________ by the frictional forces, and the resultant force is ___.

Answer 3

accelerates downwards
gravity

frictional forces
increase

terminal velocity
gravity
balanced
0

Question 4

In a velocity time-graph,

firstly the object ______________________ because of the force of gravity.

The ___________________ acts downwards because the _______________________________ than the weight of the object.

Answer 4

accelerates at first

resultant force
frictional force against it is less

Question 5

In a velocity-time graph,

After a few seconds, the object is still ______________________________.

The resultant force still acts _______________ but is ______________ because the frictional force acting against it is ________________________________.

But is still ________ than the weight of the object.

Answer 5

accelerating at a slower rate

downwards
decreasing
increasing as the speed increases

less

Question 6

In a velocity-time graph,

When the line is flat, the object is __________________ any more.

It has reached its ____________________.

The resultant force is ___ because the __________________ acting against it is now the ________ as the __________ of the object.

The object only stops falling once it has hit the ground.

Answer 6

not accelerating

terminal velocity

0
frictional force
same
weight

Question 7

What is momentum?

Answer 7

The product of mass and velocity.

Question 8

What is the equation for the conservation of momentum:

In a closed system,
x= x

Answer 8

total momentum before an event = total momentum after the event

Question 9

Explain why bowling ball slows down when it hits the pin.

The bowling ball _____ momentum while the pin ______ momentum.
Momentum is __________________ in a collision.
So total _________________________________________________.

Answer 9

loses
gains
always conserved
total momentum before= total momentum after

Question 10

A bowling lane is horizontal.
Explain why the bowling ball decelerates as it travels along the lane:

The resistive force: ___________ acts on the bowling ball.

So the __________________ is in the _________________ to the velocity.

Answer 10

friction

resultant force
opposite direction