Changing speed Flashcards Preview

Physics Module 3 > Changing speed > Flashcards

Flashcards in Changing speed Deck (11):
1

Describe the trends in speed and time from a simple
speed-time graph:

• horizontal line – constant speed
• straight line positive gradient – increasing speed
• straight line negative gradient – decreasing
speed.

2

Recognise that acceleration involves a change in
speed (limited to motion in a straight line):

• speeding up involves an acceleration
• slowing down involves a deceleration
• greater change in speed (in a given time) results
in higher acceleration.

3

what is acceleration measured in?

metres per second squared (m/s2)

4

equation for acceleration

acceleration = change in speed / time taken

5

what factor is important when describing
the motion of an object?

direction

6

what is the velocity of an object?

its speed combined with its direction

7

Describe graphs of speed against time for uniform acceleration

• greater acceleration shown by a higher gradient
• the significance of a positive or negative gradient
• calculations of distance traveled from a simple
speed-time graph for uniform acceleration.

8

Describe acceleration as change in speed per unit
time and that:

• increase in speed results from a positive
acceleration
• decrease in speed results from a negative
acceleration or deceleration.

9

what does it mean if two objects moving in opposite
directions at the same speed?

their velocities will have identical magnitude but opposite signs.

10

Calculate the relative velocity of objects moving in
parallel.

Relative velocity = velocity 1 - velocity 2

11

what does acceleration involve a change in?

• in speed
• in direction
• in both speed and direction.