The Impulse of a force. What is Impulse ? When a force acts on an object, it can change the motion of the object. The change will depend on the size of.

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Presentation transcript:

The Impulse of a force

What is Impulse ? When a force acts on an object, it can change the motion of the object. The change will depend on the size of the force and how long a time the force acts for. The impulse is the size of the force ( F ) multiplied by the time ( t ) for which it acts. Impulse = Ft

More about Impulse Impulse has no special symbol. Impulse has no special units. We use newton seconds ( Ns )

Impulse and Momentum

An example A footballer taking a penalty kick strikes the ball for a time of 0.3 seconds using an average force of 120 newtons. If the mass of the ball is 430g, find the speed of the ball immediately after it is kicked.

An example A footballer taking a penalty kick strikes the ball for a time of 0.3 seconds using an average force of 120 newtons. If the mass of the ball is 430g, find the speed of the ball immediately after it is kicked. t = 0.3 s F = 120 N m= 430 g = 0.43 kg v = ? u = 0

An example A footballer taking a penalty kick strikes the ball for a time of 0.3 seconds using an average force of 120 newtons. If the mass of the ball is 430g, find the speed of the ball immediately after it is kicked.