Classifying forces
What is the unit of force?
Newton
True or False:
The earth is constantly exerting a force on you?
What is true?
A field force of attraction between any two objects.
What is gravity?
What is the capital of France?
Paris
Any change in motion must be initiated by a ___ force.
Unbalanced.
The Law of inertia sates that…
object will remain in their current state unless acted on by a net external force.
True or false:
static friction is always less than the sliding friction between the same two objects.
What is false?
What was the space craft name that took it the first men to the moon?
Apollo 11
The branch of physics that studies forces and how they change an object‘s motion is called…
Dynamics.
True or false:
Halving the mass of an object will halve its acceleration.
What is false?
An astronaut on the moon has ____ than on earth.
What is less weight.
Who assassinated Abraham Lincoln?
JOhn Wilkes Booth.
One newton accelerates at a ____ mass at 1m/s2
1kg
What is 6.0N?
The direction of friction is _____ the direction of motion.
What is opposite to?
What is the longest river in the world?
The Nile river
Give one example of a contact force and field force.
Contact force: Friction, normal force, tension.
Field force: magnetic, electric, gravitational.
What force prevents you from falling to the center of the earth when standing on a sidewalk?
The normal force. It pushed you upward with a force that is equal in magnitude but opposite in direction to your weight.
State two ways that you could decrease the gravitational force between you and the earth?
By reducing your mass or by increasing your distance from the earth.
What is the chemical symbol for Gold?
Au