Physics Section 1 Revision

Section 1 Revision as per Edexcel 9-1 GCSE Revision Guide. Acceleration. (pages 12-30)

?

Acceleration

  • Acceleration is the change in velocity in a certain amount of time.
  • The equation for the average acceleration (m/s squared) is;

a= (v-u) ÷ t

  • Where v is the final velocity in metres per second.
  • Where u is the initial velocity in metres per second.
  • Where t is time in seconds.

Deceleration is just negative acceleration (if something slows down, the change in velocity is negative)

1 of 4

Acceleration

  • Constant acceleration is sometimes called uniform acceleration.
  • Acceleration due to gravity (g) is uniform fo objects in free fall.
  • It's roughly equal to 10m/s².
  • The equation for uniform acceleration is;

v² - u² = 2 x a x x

  • Where v is final velocity (m/s).
  • Where u is initial velocity (m/s).
  • Where a is acceleration (m/s²)
  • Where x is distance (m)
2 of 4

Acceleration

Revision Question:

Question 1) A ball is dropped from a height, h, above the ground. The speed of the ball just before it hits the ground is 5m/s. Calculate the height the ball is dropped from.

3 of 4

Acceleration

Revision Answers:

Question 1)

u= 0m/s

v= 5m/s

a=g=10m/s²

x=(v²-u²) ÷ 2a = (25-0) ÷ (2x10)

= 1.25m

4 of 4

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Forces and Motion resources »