# data[].attributes.body
if the forces are in the same direction you would add them together to get the net force in the one direction, if they are in different directions you would subtract them and whichever side is bigger the net force would be to that side.

# data[].attributes.body
you can find the resultant velocity by taking the velocity a bus is moving and subtracting it by what the person on the bus is walking by if they are walking in the opposite direction or adding the persons if they are walking in the same direction.

# data[].attributes.body
part 1: force increases as mass increases.
part 2: gravitational force decreases as distance increases.

# data[].attributes.body
weight is the pull of gravity on an object, it can change if the gravity changes. mass it the amount of matter in an object, it does not change.

# data[].attributes.body
a measure of the amount of matter in an object

# data[].attributes.body
a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe.

# data[].attributes.body
a force of attraction between objects that is due to their masses.

# data[].attributes.body
combination of all the forces acting on an object

# data[].attributes.body
without it brakes wouldn't be able to stop your car, your car wouldn't be able to move, we would always slip

# data[].attributes.body
causes holes in jeans at the knee, holes in socks, wears down parts in engines.

# data[].attributes.body
you can increase friction by making the surfaces rougher. Another way to increase friction is to increase the force pushing the surfaces together.

# data[].attributes.body
you can reduce friction by using a lubricant such as grease, wax, or oil. another way to reduce friction is by switching from sliding to rolling friction. One other way to reduce friction is to make surfaces that rub against eachother smoother.

# data[].attributes.body
if there is a lot of friction you are going to need to use a lot of force, if there is little friction you will not need to use a lot of force.

# data[].attributes.body
the speed of an object in a particular direction.

# data[].attributes.body
static: not moving- when a force is applied but the object doesn't move.

# data[].attributes.body
kinetic: moving - surfaces can slide past each other or roll over each other.

# data[].attributes.headline
what is the effect of rougher surfaces on friction?

# data[].attributes.subject
what is the effect of rougher surfaces on friction?

# data[].attributes.body
the rougher the surface is, the greater the friction is.

# data[].attributes.body
a force that opposes motion between two surfaces that are in contact.

# data[].attributes.body
when the forces on an object do not produce a net force of zero, the forces are unbalanced.

# data[].attributes.body
when the forces on an object produce a net force of zero, the forces are balanced.

# data[].attributes.body
the combination of all the forces acting on an object.

# data[].attributes.body
the SI unit for force

# data[].attributes.body
a push or pull exerted on an object in order to change the motion of an object.

# data[].attributes.body
final velocity minus starting velocity divided by the time it takes to change velocity.

# data[].attributes.body
when you combine velocities you get the resultant velocity.

# data[].attributes.body
the rate at which velocity changes over time.

# data[].attributes.body
the object that appears to stay in place.

# data[].attributes.body
the distance traveled by an object divided by the time taken to travel that distance.

# data[].attributes.body
an objects change in position over time relative to a reference point.

# data[].attributes.body
total distance divided by total time

# data[].attributes.body
velocity has direction, speed does not.