CONTACT FORCE
1. Which example describes a contact force?
A. a baseball being hit by a baseball bat
B. a basketball falling toward the ground
C. a metal pin being pulled toward a magnet
D. an electric field causing a person’s hair to stand on end
A. A baseball being hit by a baseball bat
Which law states the motion of an object does not change if the net force on an object is zero?
Newton’s first law of motion
Why do astronauts in space weigh less than they do on Earth?
The distance from Earth weakens Earth’s gravitational pull on them.
What is the force that two objects exert on each other
Force Pair
What is the amount of matter in an object?
Mass
What is the net force of 150 N → and ← 275 N?
<------125 N
Newton’s second law allows scientists to calculate what?
Acceleration
What is the attractive force that exists between all objects that have mass?
Gravity
What is at rest or having no motion?
Static
What is the measure of how hard it is to stop a moving object?
Momentum
_______________ friction prevents surfaces from sliding past each other.
Static
What is the tendency of an object to resist a change in motion?
Inertia
Another word for important; momentous
Significant
what acts perpendicular to the direction of motion when an object moves in a circle?
Centripetal Force
What is the amount of matter in an object?
MASS
Up to a limit, the________________ of static friction changes to match the applied force.
strength
Which law states acceleration is equal to the net force exerted on the object divided by the object’s mass?
Newton's Second Law of Motion
What is any motion in which an object is moving along a curved path?
Circular Motion
What is a push or pull on an object by another object that is touching it?
CONTACT FORCE
What is the given direction from a starting point to describe an object’s position?
Reference direction
_____________ is friction between a surface and a fluid, such as air or water.
Fluid friction
Which law states for every action there is an equal and opposite reaction?
Newton's Third Law
a = F __ m
a=
F=
m=
A= Acceleration
F= Net Force (N)
M= Mass (kg)
What is a force that resists the motion of two surfaces that are touching?
Friction
What are combined forces that form a net force that is not zero?
Unbalanced Forces