1. Review the well-known 3ed Law of Newton and then consider a head-on collision
ID: 1871577 • Letter: 1
Question
1. Review the well-known 3ed Law of Newton and then consider a head-on collision between two vehicles on an icy, frictionless road. Don't worry - the collision was done as part of a govenment safety test- the only passengers were crash test dummies. The first vehicle is a tiny 800 pound Tonka Trebager The second is the new oversized sport utility vehicle - the monstrously massive 6500 pound, 26 foot long, gas guzzling, environment destroying, ozone depleting, greenhouse gat producing, Hummer H200. a. (1) Which vehicle experiences the greater force during the collision The TonkaThe Hammer Neitber- thgy are the same Can't Tell b. (1) Which vehicle has the grcater acceleration during the impact? The Tonka The Hrummer Neither-they are the same Can't Tell c. (1) Which vehicle has the greater change in velocity? Can't Tell The Hummer Neither -they ave the same The Tonka 2. A box weighing 20N is in free fall toward the earth. What is the reaction force? A complete answer will give a magnitude and direction of this reaction force. On what object does this reaction force act?Explanation / Answer
a) As per Newton's third law, the forces on both will be equal.
b) acceleration a = F/m
both experience same force so body whose mass is less will experience greater acceleration so
The Tonka will experience greater acceleration.
c) acceleration is the rate of change of velocity so The Tonka will have the greater change in velocity due to higher acceleration.
2) When the box is in free fall towards the Earth then there is a force of 20 N being applied by Earth on the box in the downward direction. The box also pulls the Earth towards it with the same force so the reaction force is 20 N acting on earth in an Upward direction. This reaction force acts on Earth
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