Force
What is Force?
A push or pull that causes a change in an object's motion.
5 Newtons are being applied doing to the right, and are 2 newtons are being applied to the left. Where will the ball roll?
The ball will move to the right
Who invented the First Law of Motion
Sir Isaac Newton
Newton's First Law is also known as...
The Law of Inertia
A push or pull that cause a change in an object's motion
Force
What is the unit of measure for force?
Newton
23 Newtons are being applied doing to the right, and are 9 newtons are being applied to the left. Where will the ball roll?
the ball will roll right
True or false : If you hit a curb on a skateboard you will go flying , the board will not.
True
What is inertia?
Tendency of an object to resist any change in its motion.
Forces that are equal in strength and opposite in direction and cause no change in an object's motion
Balanced forces
What is the sum of all forces acting on an object called?
Net Force
If a person pushes a box with a force of 5 newtons right and a person pushes left with a force of 15 newtons what is the net force?
10 newtons left
What is Newton's First Law?
An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by an an unbalanced force.
What types of objects have inertia?
All objects with mass
Forces that are not equal in strength and opposite in direction and cause a change in an object's motion
Unbalanced forces
If an object is not moving, the forces acting on it are said to be?
Balanced
If a person pushes a box with a force of 492 newtons right and a person pushes left with a force of 378 newtons what is the net force?
114 newtons right
What needs to happen to make a hockey puck stop sliding against the ice?
It needs to be acted on by an unbalanced force (friction)
What is the relationship between mass and inertia?
More mass means more inertia
A contact force that resists the sliding motion of two surfaces that are touching
Friction
What is required for an object to change speed or direction?
An Unbalanced Force
If a person pushes a box with a force of 10 newtons right and a person pushes left with a force of 10 newtons what is the net force?
0 Newtons
In the following example, what is the unbalanced force: A car is driving down the street, but comes to an abrupt stop when it hits a tree.
The tree
Which object has more inetia?
A desk or an 18-wheeler
18-wheeler
An attractive force that exists between all objects that have mass
Gravity