Motion (forces)
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Motion (Forces)
Newton’s First Law
Newton’s First Law of Motion – An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force.
What is Force?
A Force is a push or a pull that one body exerts on another.
Not all forces are noticeable – Ex. Force of the atmosphere, force of floor on your feet, force of gravity on your body.
Changing Motion
A force can cause the motion of an object to change Ex. Playing tennis Racket
hits the ball, causing it to stop and move in the opposite direction
Velocity was changed when the force was applied to the moving ball.
Balanced Forces **Force does not always change velocity. Some forces are balanced – Ex. Two people pushing on a box. – Both people are applying equal force but in the opposite direction. – When two or more forces act on an object at the same time, the forces combine to form the net force.
Unbalanced Forces – Ex. When two students are pushing a box with unbalanced force, the student who applies greater force will cause the box to move in the direction of the force. – Net force will be calculated as the difference in the two forces (subtracting).
– Ex. When the students are both pushing a box in the same direction, the forces are combined. – The net force is calculated by adding the two forces.
Inertia & Mass
Inertia is the tendency of an object to resist any change in its motion. Mass is the amount of matter in an object. Ex. Bowling ball vs. Tennis ball – More mass means more force needed to change an object’s motion.
The more mass an object has, the greater its inertia. LAW OF INERTIA – According to Newton, an object moving at a constant velocity keeps moving at a constant velocity unless a force acts on it. – An object at rest will remain at rest.
What happens in a crash?
When a vehicle comes to a sudden stop, the person moves the same speed the car was traveling. – Ex. Car crashes at 55 mph; person would move at the same speed.
Newton’s First Law
Newton’s First Law of Motion – An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force.
What is Force?
A Force is a push or a pull that one body exerts on another.
Not all forces are noticeable – Ex. Force of the atmosphere, force of floor on your feet, force of gravity on your body.
Changing Motion
A force can cause the motion of an object to change Ex. Playing tennis Racket
hits the ball, causing it to stop and move in the opposite direction
Velocity was changed when the force was applied to the moving ball.
Balanced Forces **Force does not always change velocity. Some forces are balanced – Ex. Two people pushing on a box. – Both people are applying equal force but in the opposite direction. – When two or more forces act on an object at the same time, the forces combine to form the net force.
Unbalanced Forces – Ex. When two students are pushing a box with unbalanced force, the student who applies greater force will cause the box to move in the direction of the force. – Net force will be calculated as the difference in the two forces (subtracting).
– Ex. When the students are both pushing a box in the same direction, the forces are combined. – The net force is calculated by adding the two forces.
Inertia & Mass
Inertia is the tendency of an object to resist any change in its motion. Mass is the amount of matter in an object. Ex. Bowling ball vs. Tennis ball – More mass means more force needed to change an object’s motion.
The more mass an object has, the greater its inertia. LAW OF INERTIA – According to Newton, an object moving at a constant velocity keeps moving at a constant velocity unless a force acts on it. – An object at rest will remain at rest.
What happens in a crash?
When a vehicle comes to a sudden stop, the person moves the same speed the car was traveling. – Ex. Car crashes at 55 mph; person would move at the same speed.
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