3 : Motion

Question 1

average speed

Answer 1

• s= d/t
• rate in change of distance

Question 2

velocity

Answer 2

• SUVAT
• v = x/t
• rate of change in displacement

Question 3

acceleration

Answer 3

• SUVAT
• a = ∆v (v-u) / t
• rate of change in velocity

Question 4

displacement

Answer 4

• how far an objects travelled from its starting point in a given direction

Question 5

thinking distance

Answer 5

• the distance travelled between the moment when you first see a reason to stop and the moment the brakes are applied
• speed x reaction time

Question 6

braking distance

Answer 6

• distance travelled from the time the brake is applied until the vehicle stops

Question 7

stopping distance

Answer 7

• braking + thinking

Question 8

acceleration due to gravity

Answer 8

• objects with mass exert a gravitational force on each other
• objects released on earth will accelerate vertically downwards
• with no other force on it = free fall
• g = 9.81ms^ -2

Question 9

projectile motion

Answer 9

vertical and horizontal motion are independent of each other
(assume no air resistance)

Question 10

vertical motion

Answer 10

• changes due to acceleration of free fall
• vertical displacement and time f slight can be calculated using SUVAT

Question 11

horizantal motion

Answer 11

remains constant

Question 12

horizontal acceleration

Answer 12

gcos90 = 0