TRUE or FALSE: Earth's gravity acts downward toward the center of the Earth.
TRUE
TRUE or FALSE: The law of inertia states that an object in motion will eventually slow down and come to a compete stop if it travels far enough in the same direction.
FALSE
This friction force acts on objects that are at rest and needs to be 'overcome' in order to cause acceleration.
static friction
The curved path caused by the combination of initial forward velocity and the downward force of gravity is known as __________.
projectile motion
What is the difference between MASS and WEIGHT?
Mass is a measure of the amount of 'stuff' an object is made out of; Weight is a measure of force of gravity acting on an object.
__________ is the tendency of an object to resist change in it motion.
inertia
What is the formula used to calculate the weight of an object?
Weight = mass of the object x acceleration due to gravity
What is the formula used to describe Newton's 2nd Law?
F = m x a (or any correct variation!)
a = F/m
m = F/a
On the moon, the acceleration due to gravity is only about one sixth that on Earth. Thus, an object will weight _________ on the moon than it weighs on Earth.
less
A force is defined as a ________ or a _________.
push or a pull
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
TRUE or FALSE: Fluid friction is a force that opposes the motion of an object through a fluid such as water.
TRUE
What do we call the OVERALL force acting on an object after all the forces are combined?
Net force
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
If an object is already moving, how can a force change its motion?
A force can change the objects velocity (speed and/or direction)
TRUE or FALSE: The acceleration of an object is always in the same direction as the net force acting on the object.
TRUE
What force causes a 1 kg mass to accelerate at a rate of 1 meter per second each second?
1 Newton
TRUE or FALSE: Because the weight formula shows that mass and weight are proportional, doubling the mass of an object will not affect its weight.
FALSE
___________ is an attractive force that pulls objects together.
Gravity
How do BALANCED forces affect the motion of an object?
Balanced forces DO NOT affect the motion of an object.
According to Newton's 2nd law of motion, acceleration of an object depends upon the _______ of the object and the __________ acting on it.
mass, net force
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
TRUE or FALSE: If the same force acts upon two objects with different masses, the acceleration will be greater for the object with greater mass.
FALSE
When drawing a Free Body Diagram, in what direction will you draw an arrow to represent gravity?
Downward
When drawing a Free Body Diagram, in what direction will you draw an arrow to represent the normal force?
Upwards
TRUE or FALSE: According to Newton's 1st law of motion, an object's state of motion does not change as long as the net force acting on it is zero.
TRUE
How do UNBALANCED forces affect the motion of an object?
The object accelerates (changes is velocity - speed and/or direction)
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.
When drawing a Free Body Diagram, how would you represent that the applied force on an object is greater than the force of friction?
Use a larger arrow
Which frictional force is usually greater between two objects/surfaces: static frictional force or sliding frictional force.
static frictional force
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