Force
A push or pull
force
What is mass?
the amount of matter in an object. (How heavy or light something is)
Velocity describes both speed and this.
This is the event that happens when two or more objects hit or come into contact with each other.
In a system, forces that cancel each other out result in this type of motion.
No change in motion
the force that pulls us down to Earth
Gravity
Compared to a lighter object, a heavier object needs this to speed up.
A greater force
When an object speeds up, slows down, or changes direction, it is undergoing this.
A change in velocity
During a collision, two objects exert forces on each other that are this size?
Equal in magnitude
This term describes any change in an object’s speed or direction.
acceleration
When forces on an object are equal in size and opposite in direction, they are called this.
Balanced Forces
If two objects experience the same force, the object with more mass will have this kind of acceleration.
Less acceleration
An object moves 30 meters in 5 seconds. What is its speed?
6 m/s
This term describes how motion changes after a collision.
change in velocity
If you remove friction, an object pushed on a smooth surface will do this.
Keep moving
This force acts in the opposite direction of motion when two surfaces rub against each other. It slows the object down.
Friction
In a collision, the object with greater mass is more likely to do this to the other object.
If two objects travel the same distance in different times, the one taking less time has this.
Higher velocity
If a fast-moving light object collides with a heavy object, the lighter object typically shows this.
A greater change in motion
A box is pushed from the right with 30N of force. It is pushed from the left with 35N of force. Are the forces balanced and will the object move?
They are unbalanced and the object will move.
The combination of all forces acting on an object is called this.
Net force
Doubling an object’s mass while keeping the same force results in this change to acceleration.
Decreases the acceleration
A car traveling 20 m/s north changes to 20 m/s east. Even though the speed is the same, velocity changes because of this.
Change in direction
When two objects collide, the object that experiences the greater change in velocity is the one with less of this.
mass
If an elephant sneezes while standing on a skateboard, the skateboard shoots backward. Why?
Because every action has an equal and opposite reaction!