UGHHH PHYSICK !

What is momentum and its unit?

• product of mass and velocity

• product of mass and speed

• kgms^-1

• kgms^-2

• maximum point

• area under the graph

• x-intercept

• y-intercept

If the net external forces on the system is zero,the total linear momentum is constant

• True

• False

• None

In any collision the ____ is always conserved in isolated system.

• Momentum

• Total momentum

• Total energy

• Total kinetic energy

Total kinetic energy is not conserved in

• Elastic collision

• Inelastic collision

What is Newton's Third Law?

• Object in motion stays in motion and an object at rest stays at rest unless acted on by a outside force

• Force = mass x acceleration

• For every action there is an equal and opposite reaction

Granny (m=80 kg) whizzes around the rink with a velocity of 6 ms 1. She suddenly collides with John (m=40 kg) who is at rest directly in her path. She picks him up and continues in motion without “braking". Determine the velocity of Granny and John.

• m₁u₁ + m₂u₂ = v(m₁+ m₂)

• Ft = mv - mu

• W = mg

If question ask you to determine the collision is elastic or inelastic,what step should be done.

• 1) calculate ΣK_i

  2) Calculate ΣK_f

  3) Compare the value

  4) ΣK_i = ΣK_f (elastic)

  ΣK_i ≠ ΣK_f (inelastic)

• use formula ΣK_i = ΣK_f

• use formula ΣE_i = ΣE_f

• 1) calculate ΣE_i

  2) Calculate ΣE_f

  3) Compare the value

  4) ΣE_i = ΣE_f (elastic)

  ΣE_i ≠ ΣE_f (inelastic)

What type of formula/principle that need to use to solve this question.

• Conservation of linear momentum

• Conservation of angular momentum

• Conservation of Energy

• Free fall

1. States the newton’s second law.

• - the rate of change of linear momentum on a body is proportional to the net external forces force which exerts on the body and is in the direction the force.

• - an object remains in its state of rest or of uniform motion in a straight line unless acted by a net external force

• - Every action there is a reaction of equal magnitude and in straight line , but opposite direction.