Physics
I
Additional
Problems Do all work on a separate sheet of paper !!!
Newton’s
Laws 2 points each
1.
How much tension force (FT) must a rope withstand if it is
used to accelerate a
1700
kg car at a rate of .5 m/s/s ??
2.
The “push-off” period when a flea jumps lasts about 1.0 x 10-3
seconds, during
which
time the flea’s legs push against the ground and accelerate the flea to a speed
of 1.0 m/s. Consider the mass of the
flea to be 5.0 x 10–7 kg.
Calculate the force applied by the flea against the ground.
3.
A net force of 26.4 N accelerates an object at 10.8 m/s/s. What is the mass of the
object
??
4.
How much force is needed to accelerate a 6.0 gram bullet from rest to
500 m/s
over
a distance of .70 meters ??
5.
A person has a reasonable chance of surviving an automobile crash if the
deceleration
does not exceed 30 g’s (30 times the acceleration of gravity). Calculate the force on a 65 kg person accelerating
at this rate.
6.
What is the force exerted on a 7.0 kg shot by a shot-putter if the shot
is moved
through
a distance of 1.7 meters and is released with a speed of 14.0 m/s ??
7.
A .10 gram spider is descending on a strand that supports the spider with
a tension
force
(FT) of 5.6 x 10 –4 N.
Ignoring things like air resistance, friction, etc., what would be the
acceleration of the spider ??
Extra
Credit: (10 pts)
8. An exceptional standing jump would raise
a person .80 meters off the ground. To
do
this, what force must a 70 kg person exert against the ground ?? (Assume that the person must first lower
himself .2 meters in order to accelerate for the jump.)