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A force is defined as a ________ or a _________.
push or a pull
TRUE or FALSE: A force can act to cause an object at rest to move or it can accelerate an object that is already moving.
TRUE
If an object is already moving, how can a force change its motion?
A force can change the objects velocity (speed and/or direction)
What force causes a 1 kg mass to accelerate at a rate of 1 meter per second each second?
1 Newton
What do we call the OVERALL force acting on an object after all the forces are combined?
Net force
How do BALANCED forces affect the motion of an object?
Balanced forces DO NOT affect the motion of an object.
How do UNBALANCED forces affect the motion of an object?
The object accelerates (changes is velocity - speed and/or direction)
TRUE or FALSE: Friction is a force that helps objects that are touching move past each other more easily.
FALSE
List at least TWO types of friction.
static, sliding, rolling, fluid
This friction force acts on objects that are at rest and needs to be 'overcome' in order to cause acceleration.
static friction
Which frictional force is usually greater between two objects/surfaces: static frictional force or sliding frictional force.
static frictional force
TRUE or FALSE: Fluid friction is a force that opposes the motion of an object through a fluid such as water.
TRUE
___________ is an attractive force that pulls objects together.
Gravity
TRUE or FALSE: Earth's gravity acts downward toward the center of the Earth.
TRUE
Describe how air resistance and gravity affect the motion of a falling object.
Gravity (downward force) causes the object to accelerate; Air resistance (upward force) acts opposite gravity to slow the object down.
TRUE or FALSE: Terminal velocity is the constant velocity of a falling object when the force of air resistance equals the force of gravity.
TRUE
