All forces have both a - and a -
size, direction
A force can cause an object to change its - or -
speed, direction
A change in an object's motion occurs because of a -
force
Force is expressed in -
Newtons (N)
Forces exist only when there is an object for them to - on
act
A force exerted during contact between objects is a - force
contact
Give an example of a contact force
Friction
T/F: Forces cannot act at a distance
F (can)
Give an example of a force that acts at a distance
Magnetic force
To determine net force when forces act in the same direction, you - the forces.
add
To determine net force when forces act in opposite directions, you subtract the - force from the - force and use the direction of the larer force.
smaller, larger
- forces will not cause a change in motion of a moving object or cause a nonmoving object to start moving
Balanced
- forces produce a change in the object's motion
Unbalanced
Unblanced forces can produce a change in an object's -, - or both.
speed, direction
Acceleration is always in the direction of the - force.
Net