Translational Motion

Question 0

What is speed/velocity at max. height of parabola?

Answer 0

Speed is minimum but not zero because of x-component of speed which stays constant. Applies for velocity too.

Question 1

An object’s flight time depends only on x or y component of motion?

Answer 1

Y-component of motion only

Question 2

Kinematic equation w/out final velocity

Answer 2

y = y(0) + v(0)t + (1/2)at^2

x = x(0) + v(0)t + (1/2)at^2

Question 3

Kinematic equation w/out displacement

Answer 3

v = v(0) + at

Question 4

Kinematic equation w/out time

Answer 4

v^2 = v(0)^2 + 2a[y - y(0)]

v^2 = v(0)^2 + 2a[x - x(0)]

Question 5

Kinematic equation w/out acceleration

Answer 5

y - y(0) = (1/2) [v + v(0)] t

x - x(0) = (1/2) [v + v(0)] t

Question 6

What happens to the range (x-displacement) an object covers when mass is changed in simple projectile motion?

Answer 6

Nothing, mass does not affect on range because gravity affects all objects regardless of mass

Range = [v(0)^2 * 2h] / g

Question 7

When comparing A in terms of B, do ratios correctly

Answer 7

A / B = #(A) / #(B)

Multiple B over to get how many times more or less A is compared to B
____________________________________________
NOT!!!
A * #(A) = B * #(B)

And divide #(A) to get A compared to B

Question 8

What direction is firing object from shore to sea?

Answer 8

Offshore direction

Question 9

What direction is firing object from sea to shore?

Answer 9

Onshore direction

Question 10

Is there more or less air resistance on a hot day?

Answer 10

Less because air less dense on hot day

Question 11

If there is transfer of momentum and kinetic energy, does mass matter? (Ex. Slingshot)

Answer 11

Yes, this is not simple projectile motion, heavier object will have lower initial velocity

Question 12

Is shooting at 45 degree angle always going to give largest range?

Answer 12

Not always, only if starting and ending points are the same height

Question 13

In circular motion, is velocity zero, constant, or changing? And is there acceleration?

Answer 13

Velocity is always changing because direction of object is changing, therefore there is acceleration too. Speed can be constant though because no direction included.

Question 14

Wind resistance increases or decreases acceleration?

Answer 14

Decreases because wind resistance opposes direction of motion

Ex. When object falling, wind resistance it is upward force that reduces overall downward force of gravity

Ex. When object thrown up, wind resistance is downward force so would increase acceleration

Therefore the time of flight with or without wind resistance would be the same if object follows parabolic motion

Wind resistance also affects horizontal direction of motion

Question 15

Backspin…

Answer 15

Lift created from increase in upward force of object which can also increase range

Question 16

Range equation where starting and ending point are same height

Answer 16

R = { v(0)^2 sin[2(theta)] } / g

Question 17

For a launch angle of 45 degrees, the range is…?

Answer 17

Range is 4 times max. height