While Physics problems usually explore the interactions between force and motion with a focus on velocity and acceleration, we mustn't forget that mass has an equally significant part to play.
Key Concepts
Use quizzes to practise application of theory.
START QUIZ!
A ball with mass m has velocity v just before hitting the ground. Just after hitting the ground it has velocity 1/2v.
The initial momentum is:
Down is normally negative
A ball with mass m has velocity v just before hitting the ground. Just after hitting the ground it has velocity 1/2v.
The impulse is:
final - initial = 1/2mv - -mv
A ball with mass m has velocity v just before hitting the ground. Just after hitting the ground it has velocity 1/2v.
The direction of the impulse is:
positive is up
The density of the red balls is twice that of the blue balls
Which ball has the biggest momentum?
the red balls have bigger mass
The density of the red balls is twice that of the blue balls
The velocity vector is twice as long so velocity of D is twice as big.
radius of all balls is equal so volume the same. if density 2x the mass 2x
Which of the following (more than one) are possible units for impulse?
mv - kg ms-1
Ns - kg ms-2 s = kg ms-1
The motion of a 3 kg ball is represented by the following graph.
The momentum after 4s wil be
acceleration is 3 ms-2 so in 4s velocity will be 12 ms-1
The motion of a 2 kg ball is represented by the following graph
The momentum of the ball is:
velocity = gradient = -2 ms-1
How much of Inertia, momentum and impulse have you understood?
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