kinematics

Question 1

Distance

Answer 1

• The total length covered by a moving object regardless of the direction of motion
• SI unit: metre (m)

Question 2

Displacement

Answer 2

• The distance measured in a straight line from a fixed reference point
• SI unit: metre (m)

Question 3

Speed

Answer 3

• The distance travelled per unit time
• formula: speed= distance travelled / time taken
• SI unit: metre per second (m s-1)

Question 4

Velocity

Answer 4

• The rate of change in displacement
• formula: velocity= displacement / time taken
• SI unit: metre per second (m s-1)

Question 5

Instantaneous speed

Answer 5

• the speed of an object at a particular instant
• formula: average velocity = total displacement / total time taken
• SI unit: metre per second (m s-1)

Question 6

Acceleration

Answer 6

• The rate of change of velocity
• formula: acceleration= change of velocity / time taken
• SI unit: metre per second per second (m s-2)
• an object accelerates when there is a change in speed, direction or both

Question 7

Relationship between velocity and acceleration

Answer 7

• if an object is moving with increasing velocity, it is accelerating
• if an object is moving with decreasing velocity, it is decelerating
• uniform acceleration is a constant rate of change of velocity. This means the change in the velocity of the object per unit time is the same
• non-uniform acceleration is when the change in the velocity of the object per unit of time is not the same as