Physics: Momentum Flashcards
The difference between impulse and impact force involves the
time the force acts
It is correct to say that impulse is equal to
the change in momentum
Suppose a gun were made of a strong but very light material. Suppose also that the bullet is more massive than the gun itself. For such a weapon
the target would be safer than the shooter
Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a. tower, they reach the ground at the same time, but A has a greater
momentum
When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, you make the time of the impact about 10 times as great sas for a stiff legged landing. In this way the average force your body experiences is
about 1/10 as great
When you are in the way of a fast-moving object and can’t get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a
long time
A bullet is fired from a gun. The speed of the bullet will be able the same as the speed of the recoiling gun
if the mass of the bullet equal the mass of the gun
Padded dashboards in cars are safer in an accident than nonpadded ones because an occupant hitting the dash has
increased time of impact & decreased impact force (a and c)
The force on an apple hitting the ground depends upon
the speed of the apple just before it hits & the time of impact with the ground
& whether or not the apple bounces (all of the above)
Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be
zero
A 1-N apple falls to the ground. The apple hits the ground with an impact force of about
not enough info. given to say
You’re driving down the highway and a bug splatters into your windshield. Which undergoes the greater change in momentum?
both the same
