Chapter 9.2 Velocity and acceleration

Question 1

What is the equation for the acceleration of an object?

Answer 1

v -u/t

Question 2

What is change in velocity?

Answer 2

Change in velocity = v -u

Question 3

What does the V and U mean in the equation of acceleration?

Answer 3

final velocity - v

initial velocity - u

Question 4

What is the definition of velocity?

Answer 4

Velocity is speed in a given direction.

Question 5

What is a vector quantity?

Answer 5

A vector is a physical quantity that has a direction as well as a magnitude.

Question 6

What is a scalar quantity?

Answer 6

A scalar is a physical quantity that has a magnitude only and does not have a direction.

Question 7

What is the definition of deceleration?

Answer 7

Deceleration is the change of velocity per second when an object slows down.

Question 8

Q: A car moving at a velocity of 28m/s brakes and stops in 8.0s.
Calculate its deceleration.

Answer 8

Initial velocity u= 28m/s final velocity v=0
time taken t = 8.0

acceleration a= v-u/t
= 0m/s - 28 m/s/ 8.0 = -3.5m/s2
a= -3.5m/s2
Therefore the deceleration is 3.5m/s2(metres per second squared)