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Velocity is a vector quantity, which means it has a direction and a magnitude. Newtons second law says that force is equal to rate in change of velocity. When an object is travelling in a circle with cons...

In a car crash the car decelerates really quickly. If there is no air bag your head continues to travel at the same speed as before until it hits the dash board and decelerates really quickly upon impact,...

Think about the definition of acceleration - it is the rate of change of velocity. Your statement that the object's speed is constant is correct, can you think about why the object's velocit...

Angle through which the earth rotates = 2pi

Time to do so = 246060 = 86400s

Angular velocity = 7.3x10^-5rads^-1

Lets consider a skydiver jumping from an airplane. Once the skydiver has let go of the plane they are pulled towards the earth due to gravity.

By Newton’s second law:

F = ma,

the sky ...