Force
A push or pull that causes an object to move
* change in speed
* change in direction
* change its shape
Motion
An object's change in position over time
Newton
The unit used to measure force
Balanced forces
Forces that cancel each other because they are equal and opposite; no change in motion
Unbalanced forces
A force that is stronger in one direction than the opposite force; produces a change in motion
Net force
The total amount of force acting on an object
Friction
A force that resists motion between two surfaces that are touching
Mass
The amount of matter in an object
Distance
The amount of space between two things
Simple Machine
Device that makes work easier by changing the direction or size of the force that is applied
Inclined Plane
A flat surface with a slope ( tilt ) that is used to move an object from a lower place to a higher place or vice versa; ramp
Pulley
A wheel with a groove in the middle of its rim; changes the direction of the force needed to move an object
Acceleration
Any change in the speed or direction of an object
* speeding up
* slowing down
* changing direction
Velocity
The speed of an object in a particular direction; moves in a specified direction
* speed and direction
* 25 m/s to the south
Speed
The rate at which an object moves; the ratio of the distance an object travels compared to the time it takes to travel that distance
Speed = total distance / total time
Force
A push or pull that causes an object to move
* change in speed
* change in direction
* change its shape
Motion
An object's change in position over time
Newton
The unit used to measure force
Balanced forces
Forces that cancel each other because they are equal and opposite; no change in motion
Unbalanced forces
A force that is stronger in one direction than the opposite force; produces a change in motion
Net force
The total amount of force acting on an object
Friction
A force that resists motion between two surfaces that are touching
Mass
The amount of matter in an object
Distance
The amount of space between two things
Simple Machine
Device that makes work easier by changing the direction or size of the force that is applied
Inclined Plane
A flat surface with a slope ( tilt ) that is used to move an object from a lower place to a higher place or vice versa; ramp
Pulley
A wheel with a groove in the middle of its rim; changes the direction of the force needed to move an object
Acceleration
Any change in the speed or direction of an object
* speeding up
* slowing down
* changing direction
Velocity
The speed of an object in a particular direction; moves in a specified direction
* speed and direction
* 25 m/s to the south
Speed
The rate at which an object moves; the ratio of the distance an object travels compared to the time it takes to travel that distance
Speed = total distance / total time