1) A car is waiting at a stoplight. The car has a mass of 1200 kg. What is the force (magnitude and direction) that the road puts on the wheels? Note that problems 2, 3 and 4 ask for the force of friction only, not the normal force. 2) The same car accelerates out of the stoplight at 1.5 m/s 2 . Draw a free-body diagram of the car and find the force of friction (magnitude and direction) that the road puts on the wheels.
1) A car is waiting at a stoplight. The car has a mass of 1200 kg. What is the force (magnitude
and direction) that the road puts on the wheels?
Note that problems 2, 3 and 4 ask for the
2) The same car accelerates out of the stoplight at 1.5 m/s
2
. Draw a free-body diagram of the
car and find the force of friction (magnitude and direction) that the road puts on the wheels.
3) The same car reaches a top speed of 15 m/s, then begins braking. It comes to a halt in 20
seconds. Draw a free body diagram of the car and find the force of friction (magnitude and
direction) that the road makes on the wheels now..
4) The same car is now towing a 200kg trailer. It accelerates out of the stoplight a little slower,
at 0.8 m/s
2
. Draw free-body diagrams of the car and the trailer as it accelerates. What is the
force of friction that the road makes on the car wheels now?
5) An airplane passes by overhead. The plane has a mass of 50,000 kg, is at an altitude of
10,000 meters and moves at a constant velocity of 150 m/sec. The altitude, velocity and
direction of travel all are constant. Draw a free-body diagram of the airplane, including air drag.
Identify as many forces as you can think of but do not try to calculate them.
*Haven't seen question's 4 or 5 answered as of yet on bartleby.
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