2/15/2021 physics ch.

4 Flashcards | Quizlet

physics ch. 4
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Physics Physics Football Baseball Force

Terms in this set (8)

A baseball batter hits an a. 450 N

incoming 40-m/s
fastball. The ball leaves
the bat at 50 m/s after a
ball-on-bat contact time
of 0.030 s. What is the
force exerted on the
0.15-kg baseball?
a. 450 N
b. 250 N
c. 90 N
d. 50 N

A shot-putter moves his b. 350 N

arm and the 7.0-kg shot
through a distance of 1.0
m, giving the shot a

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velocity of 10 m/s from

rest. Find the average
force exerted on the
shot during this time.
a. 175 N
b. 350 N
c. 525 N
d. 700 N

An automobile of mass 2 b. 90 m
000 kg moving at 30 m/s
is braked suddenly with a
constant braking force of
10 000 N. How far does
the car travel before
stopping?
a. 45 m
b. 90 m
c. 135 m
d. 180 m

A barefoot field-goal c. 600 N

kicker imparts a speed of
30 m/s to a football at
rest. If the football has a
mass of 0.50 kg and time
of contact with the
football is 0.025 s, what
is the force exerted on
the foot?
a. 190 N
b. 380 N
c. 600 N
d. 900 N

Rita accelerates a 0.40- c. 24 N

kg ball from rest to 9.0
m/s during the 0.15 s in
which her foot is in
contact with the ball.
What average force
does she apply to the
ball during the kick?
a. 48 N
b. 72 N
c. 24 N
d. 60 N

A vertical rope is a. 592 N

attached to an object
that has a mass of 40 kg
and is at rest. The tension
in the rope needed to

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give the object an

upward speed of 3.5 m/s
in 0.7 s is
a. 592 N
b. 390 N
c. 200 N
d. 980 N
e. 720 N

A mass 2m is attached by a. (2/3) N

a string to another mass
m as illustrated. A force
of N newtons acts on the
mass m to accelerate the
system, The force F in the
string which acts on
mass 2m, is

a. (2/3) N
b. N
c. 2N
d. 3N
e. (3/2) N

You are riding an a. 120 N

elevator thet is
accelerating upward at
2m/s2. You have a spring
balance accurately
calibrated in newtons.
When you hang a mass
of 10 Kg on the balance,
the reading of the
balance is
a. 120 N
b. 981 N
c. 76 N
d. 10 N
e. 9.81 N

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