1b. Why is Newton's first law of motion sometimes called the law of inertia? 1c. Use what you know about inertia to explain why you feel pressed back into the seat of a car when it accelerates. 2a. Newton's second law of motion in your own words. 2b. How Could you keep an object's acceleration the same if the force acting on the object were doubled 2c. Using what you know about Newton's second law, explain why a car with a large mass might use more fuel than a car with a smaller mass. Assume both cars drive the same distance.

1b. It is called law of the inertia because it overcomes intertia

1c. Why I feel pressed is because of the acceleration trying to overcome inertia .

2a.The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

2b. If the force were doubled, you double The mass it's acting on.

2c. A car with large mass will use more fuel because it needs more energy to overcome the inertia force.

Explanation:

Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless being acted upon by an external force.

1b. It specifically relates to inertia of bodies

1c. Force of the car seat on our backs

2a. Matter requires force input to influence inertia

2b. Double the mass

2c. Work = F × d, Increased force per unit acceleration, increases work and increase number of combustion to move a given distance

Explanation:

1b. Inertia is the property of an object to remain either at rest or in motion and Newton second law states that a body will remain at rest or continue its motion in a straight line unless it is acted upon by an external force.

1c. When at rest or the car is not in motion, the body and the car seat are at a specific location. When the car starts to accelerate, the forward thrust is transferred through the car seat to the body, making one feel pressed back into the seat

2a. Newton's second law of motion states that mater must be acted upon by a force to obtain a change in its rest state or linear motion

2b. We have the relationship for force as

F = m·a = Mass × Acceleration

Therefore, the force is directly proportional to the acceleration and therefor 2·F = 2·m·a

Which means for the acceleration to stay the same the mass must be doubled

2c. From the above relation, as the mass increase the force required to cause motion also increase and therefore, since work = Force × Distance

The work done by a car with a large mass is more than the work done by a car with a small mass which translates to the amount of combustion to provide a given displacement hence a car with a larger mass might use more fuel than a car with a smaller mass.

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle