Impulse-momentum

.1………….. is the product of the Force on an object and the Time interval; over which it acts

• Angular momentum

• Impulse

• Impulse momentum

• Momentum

Which is represented by the equation F.∆t=m∆v

• Angular momentum

• Angular impulse- angular momentum principle

• Impulse theorem

• Impulse-momentum principle

A ball of mass 2 kg initially at rest, is acted on by a force F (N) which varies with time t (s) as shown by the graph. The magnitude of the impulse of the force:

• 4 N.s

• 8 N.s

• 32 N.s

• 16 N.s

The equation to calculate the momentum is:

• p=mgp

• p=mv

• p=(1/2)mv^2

• p=Fm

What is conservation of momentum law?

• It says that momentum is destroyed but cannot be created

• It says that momentum is neither created nor destroyed, it only moves from one place to another.

• It says that energy is neither created nor destroyed, it only changes from one form to another

• It says that momentum is created but cannot be destroyed

How does an air bag save lives?

• It reduces the surface area that a person’s body strikes

• It exerts the force over a smaller area of the person’s body

• It reduces the force by decreasing the time interval during which it acts.

• It reduces the force by increasing the time interval during accident

The momentum of an object depends upon the object’s:

• Size and shape

• Mass and height

• Mass and velocity

• Mass and acceleration

A body of mass m hits normally a rigid wall with velocity v and bounces back with the same velocity. The change in momentum of the body is:

• Zero

• 2mv

• 1.5mv

• 4mv

Momentum is a ....................... quantity

Kinetic energy is ................. quantity