Physics

Object A

He was afraid he would be persecuted by the church, since his ideas went against the church's teachings.

Friction pushes on an object in the opposite direction it is moving, creating resistance against the object's motion, and ultimately slowing it down to a stop. Galileo said that if an object didn't have a force of friction acting upon it, it would move forever. The object is able to maintain a constant speed when friction acts upon because the object has exactly the right force to cancel out the friction force.

): Natural motion is more up and down, like smoke rising. The moving object is going to its natural resting place. Violent motion is motion that is forced, for example a bowling ball rolling because of force from an arm. Violent motion is the result of a pulling/pushing force.

Newton's first law says that an object in motion will stay in motion and an object at rest will stay at rest unless there are external forces that cause it to move. If there are no external forces acting on a moving object, it will move at a constant speed in a straightline.

It states that acceleration is directly proportional to net force, and that acceleration is inversely proportional to mass.

Both.

You would not need to exert any force on to the cannonball because there is no friction in space to stop it.

):You have to keep pedaling because of friction. There is friction between your wheels and the ground, as well as air resistance, which will slow down and eventually stop your bike. To keep the bike going, you must continue to exert force on to it. The force should be equal to the amount of friction in order to keep the bike moving at a constant speed.

Acceleration = Net force/Mass

Newton's 2nd Law of motion describes the relationship between acceleration, net force, and mass. It does not include distance. So in order to connect our experiment to Newton's 2nd Law, we had to say that the distance is directly related to the acceleration.

Inertia is the resistance that an object has to a change in its current state of motion.

The ball moves at a constant speed and in a straight line. This is an idealized situation that Galileo thought about but isn't realistic on Earth because of friction.

Every object continues in its state of rest, or of motion in a straight line at constant speed, unless it is compelled to change that state by unbalanced forces exerted upon it.

Yes. This phenomenon isn't noticeable because the earth has such a large mass that it barely moves when pulled by such a relatively small force.

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.

The car's tire pushes on the road. In response, the road pushes on the tire pushing it forward. The rocket shoots out gas (fuel). In response, the fuel pushes the rocket.

Each force applies on a different object. For example, when the rifle fires, the rifle pushes the bullet forward. Then the bullet pushes the rifle backwards. Each force is acting on a different object. It will only cancel if the same magnitude of force is applied on one object from opposite directions.

Two forces were acting on the iPad. One was the gravitational force pulling down. The other was the floor pushing up. These forces were equal magnitude in opposite directions. This creates a balance of forces. Therefore they canceled each other out and the iPad didn't move.

The net force is 15 N.

The net force is 5 N.

Net force is the combination of all the forces that act on an object.

The acceleration is doubled since net force and acceleration are directly proportional.

The acceleration is half as much since mass and acceleration are inversely proportional.

If one thing is directly proportional to something else, as one increases by a certain factor (such as doubling), the other will increase by the same factor (which means it will double). If one thing is inversely proportional to something else, as one thing increases by a certain factor, the other thing will decrease by the inverse of that factor. For example, in the equation a = Fnet / m , if the mass doubles while the net force stays the same, the acceleration will decrease by a factor of ½.

The Net Force is 10 N.

The Net Force is still 10 N.This was a trick question. Forces acting upon an object are not affected by the mass of said object. The acceleration of the box can be affected by changing the mass of the object, but you can't change the power of a force simply by changing a mass, they are not connected. It is similar to saying: if I gain weight, the force of people's punches will decrease.

If the object is being pushed and pulled in the same direction. Do not assume that just because an object is being pushed and pulled with the same amount of force that the object has no Net Force. In order for an object be pushed and pulled on and have a Net Force of 0N, is if the object is being pushed and pulled in opposite directions with the same force.

The reaction force is the water pushing you forward.

The hammer exerts a force on the nail and the nail exerts a force on the hammer. Two forces occur in this interaction.

The object stays at rest.

The object stays in motion in a straight line at a constant speed.

The ball is not accelerating positively or negatively, it is rolling at a constant speed in a straight line. This is because the net force is 0.

When a positive net force acts on an object, the object will accelerate in the direction it is pushed on, it won't move at a constant speed.

The toy car accelerates due to the 5N of force, but after the car is pushed, friction slows the car down and eventually stops it.