Newtons Laws Flashcards
What is linear motion?
Movement of an object or a body occurring in a straight line when a force acts upon it.
What do Newton’s laws of motion explain?
The principles of acceleration and movement.
Define Newton’s First Law of Motion.
Every body at rest, or moving with constant velocity in a straight line, will continue in that state unless compelled to change by an external force exerted upon it.
What is inertia?
The resistance of an object to change in its state of motion.
True or False: An object at rest will remain still until acted upon by a force.
True
What happens to a body traveling in a straight line at constant speed?
It will continue to do so unless acted upon by a force.
List the forces acting on a performer.
- Weight
- Reaction force
- Friction force
- Air resistance
In Newton’s First Law, what does it mean if there is zero net force applied to an object?
The object is stationary or moves at constant speed in the same direction.
What is Newton’s Second Law of Motion?
When a force acts on an object, the object accelerates or decelerates in the direction in which the force is acting.
Define Newton’s Second Law.
The magnitude and direction of the force applied to a body will determine the magnitude and direction of the acceleration given to the body.
What is the formula for Newton’s Second Law?
F = m x a
In the formula F = m x a, what does F represent?
Force generated.
In the formula F = m x a, what does m represent?
Mass of body or object.
In the formula F = m x a, what does a represent?
Acceleration.
What does Newton’s Third Law of Motion state?
For every action there is an equal and opposite reaction.
Explain the Law of Action and Reaction.
It describes what happens when two bodies exert forces on one another.
How can an athlete create a bigger reaction force?
By creating a more powerful muscle contraction.
Give an example of applying Newton’s Laws of Motion in a sporting activity.
A sprinter pushing back on the blocks at the start.
Fill in the blank: The bigger the ______, the bigger the acceleration.
force
What happens when two forces acting on an object are equal?
They cancel out.
List examples of when Newton’s First Law applies.
- A sprinter running at constant speed
- A cyclist going at constant speed
- A swimmer swimming at constant speed
- Any vehicle going at constant speed
- Any sportsperson standing still
What does the length of the arrow in force diagrams represent?
The magnitude or size of the force.
True or False: Large forces can act on an object moving at constant speed.
True
What does air resistance do in relation to motion?
Opposes the direction of motion of the body.
