Speed & Velocity

Question 1

What is displacement?

Answer 1

• Distance in a given direction

Question 2

What is speed defined as?

Answer 2

Change of distance per unit time

Question 3

What is velocity defined as?

Answer 3

• Change of displacement per unit time.

* Speed in a given direction.

Question 4

What is the formula for velocity?

Answer 4

Velocity = Distance / Time

Question 5

What is the formula for distance?

Answer 5

Distance travelled = Velocity x Time

Question 6

What is the formula for the speed of an object moving at a constant speed around a circle?

Answer 6

Speed = ( 2 x pi x r ) / T
T = time to move around once
2 x pi x r = circumference of the circle
r = radius

Question 7

What is the formula for average speed?

Answer 7

average speed = distance / time

Question 8

What is the formula for distance travelled in a short time interval?

Answer 8

ΔS = V x Δt

Question 9

What is the formula for velocity in a short time interval?

Answer 9

V = ΔS / Δt

Question 10

What is the formula for speed of an object in a distance ( y ) v time ( x ) graph?

Answer 10

Distance travelled / time taken= gradient of the line

Question 11

What is acceleration defined as?

Answer 11

• Acceleration is defined as the change of velocity per unit time
• Acceleration is a vector quantity
• Deceleration values are negative and signify that the velocity decreases with respect to time.

Question 12

What is uniform acceleration?

Answer 12

• Acceleration where the velocity of an object moving along a straight line changes at a constant rate.
• Acceleration is constant

Question 13

What is the formula for uniform acceleration?

Answer 13

Object that accelerates from velocity u to velocity v, in time t along a straight line:
a = change in velocity /time taken = V - U / t
a = v - u / t

Question 14

What is the formula for velocity ( re arranged from acceleration formula )?

Answer 14

V = u + at

Question 15

What is non uniform acceleration?

Answer 15

• Where the direction of motion of an object changes, or its speed changes at a varying rate, acceleration is not constant.

Question 16

What are the varoius SUVAT equations?

Answer 16

V = u + at 
S = 1/2 ( u + v ) x t
S = ut + 1/2 at ^2
V^2 = u^2 + 2as