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# Science Test 3/27/17

What is acceleration? It is when an object changes it's velocity.
What is deceleration? It is a word used out in the world for slowing down, but in physics it is not a word. In physics it's known as negative acceleration.
What is friction? Friction is a force that opposes motion between two surfaces that are in contact.
What is recoil? When something comes off an object and the original object moves in the opposite direction.
What is velocity? It is the speed and/or direction of an object.
What is a force? It is a push or pull.
What is magnetic force? The distance force that exists between two magnets caused by interaction between their magnetic fields.
Explain the free-body diagram. It is a drawing that is of an object and it shows the forces that are impacting it, and it allows you to see the net forces which is the total amount of force.
What is the difference between contact and distance forces? Contact forces occur when anything is touching and distance forces are forces that occur between objects that aren't touching.
What is the difference between energy and force? Energy is what powers force. Energy can't be created or destroyed, though forces can.
What's the difference between balanced and unbalanced forces? Unbalanced forces cause things to speed up and slow down and unbalanced forces make things move at a constant speed.
What's inertia? Once something is acted upon it remains at a constant motion unless acted by an outside unbalanced force and that continuation of motion is inertia.
Explain Ball A's behavior during the magnetic cannon (moving and moment of impact) Moving- gravity and molecules from table pushing up and magnetic force and friction. Moving right. Moment of Impact- contact force (longer) magnetic force and gravity and reaction from table molecules pushing up. No motion.
Explain Ball B's behavior during the magnetic cannon (motionless and moving) Motionless- gravity and molecules from table pushing up magnetic force and contact force. Moving- Magnetic force and friction and gravity and molecules from table pushing up. Moving right.
Created by: avniiii

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