Nature of Force & Net Force
A force is a push or a ______.
pull
Friction is a force that ______ motion.
resists/opposes
Newton’s First Law is also called the Law of ______.
Inertia
Momentum is the “quantity of ______.”
motion
What is the formula for momentum?
momentum = m x v
The SI unit of force is the ______. What is the symbol?
Newton; N
Which surface creates more friction: smooth or rough?
rough
Inertia is the resistance to change in ______.
Motion
Momentum equals mass times ______.
velocity
If mass = 2 kg and velocity = 5 m/s, what is momentum?
10 kg·m/s
The combination of all forces acting on an object is called the ______.
Net Force
Friction always acts in the ______ direction of motion.
opposite
According to Newton’s Second Law, acceleration depends on ______ and ______.
net force and mass
What are the units for momentum?
kg x m/s
If force = 12 N and mass = 4 kg, what is acceleration?
3 m/s²
If two forces act in opposite directions, you find the net force by ______ the smaller force from the larger force.
Subtracting
Gravity is a force that ______ objects toward each other.
pulls
Write the formula for Newton’s Second Law (force).
F= m x a
Which has more momentum: a 2 kg ball at 5 m/s or a 1 kg ball at 10 m/s?
They have the same momentum (10 kg·m/s each).
One student pushes right with 10 N, another pushes left with 6 N.
What is the net force and direction?
4 N to the right
What does a net force of 0 N tell you about an object’s motion?
It will not change its motion (balanced forces).
Name the two factors that affect gravitational force.
mass and distance
Why don’t action–reaction forces cancel each other out?
They act on different objects.
In a collision with no outside forces, what happens to total momentum?
It is conserved (stays the same).
What is the only force acting on an object in free fall (ignoring air resistance)?
gravity