1.) suppose the masses of two objects are the same and that object A is moving t
ID: 1284533 • Letter: 1
Question
1.) suppose the masses of two objects are the same and that object A is moving toward object B, but object B is at rest. Does one car exert a larger force on the other or are both forces the same size?
2.) Suppose two objects have the same mass and are moving toward each other at the same speed so that ma= mb and va= -vb ( same speed, opposite direction). why is the sign of the force probe A reversed?
3.) Interaction forces between two objects occur in many other situations besides collisions. For example, suppose that a small car pushes a truck with a stalled engine, as shown in the picture below. The mass of object 1 (the car) is much smaller than object 2 (the truck). At first the car doesn't push hard enough to make the truck move. Then, as the driver pushes down harder on the gas pedal, the truck begins to accelerate. Finally the car and truck are moving along at the same constant speed. when the truck is acceleration? Does either the car or the truck exert a larger force on the other or are the forces the same size?
Explanation / Answer
1. No both forces will be of same size, because these two forces are a a pair of action and reaction. They must be equal in size but opposite in direction.
2. This is because velocity is a vector quantity. While doing momentum balance proper signs must be applied.
3. The truck will start moving when the force generated by the car engine overcomes the inertia of the truck. Similar to 1st part bot exerts equal and opposite forces on each other.
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