Forces Flashcards
What is a force?
An action of one body on another
What are Newton’s Three Laws of Motion?
- Law of Inertia
- Law of Acceleration
- Law of Action & Reaction
What is the difference between mass and weight?
Mass measures an object’s inertia in kg
Weight is the force of gravity acting on an object (N)
What is the force of gravity?
9.81 m/s2
A point of application is…
The point where a force is applied
A line of application refers to…
A straight line of infinite length in the direction that the force is acting
What groups of forces can act upon a person and/or object?
External and Internal
What are the two groups of forces that can occur?
Contact and non-contact
Biomechanical models are formed by _____ which are connected by _____.
Rigid segments, rotational constraints
Force is a ______.
Vector quantity
Which has the highest gravitational force of gravity applied to it?
10 kg
What is the equation for Linear Momentum?
G= mv
What does Newton’s First Law state?
An object at rest will remain at rest/ in motion unless acted upon the actions of an external source
Newton’s Second Law states:
A body acted upon by an unbalanced external force moves such that the force is equal to the change in linear momentum (velocity) with respect to time
An object will only accelerate if external forces are ___.
Unbalanced
What are the forces acting on the ball?
Fg acting down
What does Newton’s Third Law explain?
For every force applied from one body to another, there is an equal and opposite reaction force
What are the orthogonal compartments of ground Reaction Force?
Fx and Fy
Joint Reaction Force is exerted on the axis of rotation (T/F)
True
Is there an unbalanced force in the rectangle?
Yes.
x component: cos (45) 5N= 3.53N
y component: sin (45) 5N= 3.53N
An object has a mass of 5.00 kg, and a net unbalanced external force of 200 N is applied in the positive x direction. What will the resulting linear acceleration of the object be?
Fx= max
ax= Fx/m
ax= 200N/5.00kg
ax= +40.0 m/s2
