Forces and Motion Flashcards
What is the SI unit of force?
Newton (Named after Sir Isaac)
Because a kilogram meter per second squared is too hard to say.
An object is moving at 50m/s and is experiencing a net force of 0N what will the object do?
Continue moving at 50 m/s in a straight line.
What will happen to an object that is experiencing 5N of force downward. 5N of force upward. 2N of force to the left, and 6N of force to the right.
The object will accelerate to the right.
Extra credit if the object weighed 2 kg what is its acceleration?
What is the difference between mass and weight?
Mass is the measure of the amount of substance in an object. Weight is the measure of the force of gravity on a substance. On Earth your mass equals your weight.
What would change if you start sweating, your mass or your weight?
You mass because you are losing substance. Indirectly you would also lose weight because there is lass mass for gravity to act on.
What would change if you went to the moon, your mass or your weight?
You weight because the force of gravity is less on the moon?
Explain the motion of a parachute in terms of Forces, and directions of forces.
Gravity pulls you down with an equal and opposite force of the wind resistance that is holding you up allowing you to fall at a constant speed.
The larger your parachute the more wind resistance you have, and the slower you will fall.
Explain the motion of a thrown ball in terms of forces and direction of forces.
You throw the ball with a set initial speed forward. Gravity is constantly pulling the ball down. This gives the ball a curved flight path known as projectile motion.
What law of motion defines inertia?
An object at rest will stay at rest,and an object in motion will stay in motion unless a force acts upon it.
Inertia is an objects resistance to changes in motion.
Why would you have to be careful when going around a corner on an icy road?
The cars inertia may be greater than the friction between your tires and the road, and you may continue moving in a straight line.
What does force equal?
Mass times acceleration.
You should know the relations between Force, Mass, and Acceleration.
What is Newton’s third law of motion?
For every action there is an equal and opposite reaction.
What does momentum equal?
Your mass times your velocity. If you remember from the lab these are the two variables that affected momentum.
What is conserved when two objects collide?
Momentum
Energy and mass are also conserved, but you need to know momentum.
What happens when two opposite poles of a magnet are brought near each other.
They have a magnetic attractive force over a distance.
