2-4
Describe and explain a situation that shows action-reaction forces in action.
A squid applies Newton's 3rd law of motion to move itself through the water. The squid exerts a force on the water (action force) that expels from its body cavity. At the same time, the water exerts an equal and opposite force on the squid (reaction force) causing it to move.
Compare and contrast balanced forces and action-reaction forces.
Balanced forces are equal and opposite and add up to a net force of zero. They cancel out and produce no change in motion. Action and reaction forces are equal and opposite as well, but the forces are acting on different objects. The action and reaction forces acting on an objects cannot be added together because they are acting on different objects. Both are measured in direction and strength.
How can two forces be equal but opposite at the same time? Provide an example.
If two figure skaters are skating and one pushes another, both skaters move. the skater that was pushed moves backward and the skater who pushed is pushed the opposite direction with an equal force. The only difference may be in the speeds with which the two skaters move. If they have the same mass, they will move at the same speed. But if one skater has a greater mass than the other, he or she will move more slowly and backwards.
What is Newton's 3rd Law of Motion?
Newton's third law of motion states that if one object exerts a force on another object, then the second objects exerts a force of equal strength in the opposite direction on the first object.
Explain the law of conservation of momentum. Interpret the meaning of conservation in terms of physical science.
The law of conservation of momentum states that the total momentum of the objects that interact in a collision does not change. The total momentum of any group of objects remains the same unless outside forces act on the objects.
Explain what momentum is and how it is the "quantity of motion." What is the formula to calculate momentum?
The momentum is used to describe moving objects and was said by Newton to be the "quantity of motion." Momentum is described by its direction as well as its quantity. The more momentum an object has. the harder it is to stop. Momentum= Mass x Velocity
Explain why forces are not "one-sided." How is the force exerted by the first object related to the force exerted by the second object?
Whenever one object exerts a force on a second object, the second object exerts a force back on the first object. The force exerted by the second object is equal in strength and opposite in direction to the first force.
