Forces

Question 1

What is a force?

Answer 1

An action of one body on another

Question 2

What are Newton’s Three Laws of Motion?

Answer 2

1. Law of Inertia
2. Law of Acceleration
3. Law of Action & Reaction

Question 3

What is the difference between mass and weight?

Answer 3

Mass measures an object’s inertia in kg
Weight is the force of gravity acting on an object (N)

Question 4

What is the force of gravity?

Answer 4

9.81 m/s2

Question 5

A point of application is…

Answer 5

The point where a force is applied

Question 6

A line of application refers to…

Answer 6

A straight line of infinite length in the direction that the force is acting

Question 7

What groups of forces can act upon a person and/or object?

Answer 7

External and Internal

Question 8

What are the two groups of forces that can occur?

Answer 8

Contact and non-contact

Question 9

Biomechanical models are formed by _____ which are connected by _____.

Answer 9

Rigid segments, rotational constraints

Question 10

Force is a ______.

Answer 10

Vector quantity

Question 11

Which has the highest gravitational force of gravity applied to it?

Answer 11

10 kg

Question 12

What is the equation for Linear Momentum?

Answer 12

G= mv

Question 13

What does Newton’s First Law state?

Answer 13

An object at rest will remain at rest/ in motion unless acted upon the actions of an external source

Question 14

Newton’s Second Law states:

Answer 14

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

Question 15

An object will only accelerate if external forces are ___.

Answer 15

Unbalanced

Question 16

What are the forces acting on the ball?

Answer 16

Fg acting down

Question 17

What does Newton’s Third Law explain?

Answer 17

For every force applied from one body to another, there is an equal and opposite reaction force

Question 18

What are the orthogonal compartments of ground Reaction Force?

Answer 18

Fx and Fy

Question 19

Joint Reaction Force is exerted on the axis of rotation (T/F)

Answer 19

True

Question 20

Is there an unbalanced force in the rectangle?

Answer 20

Yes.
x component: cos (45) 5N= 3.53N
y component: sin (45) 5N= 3.53N

Question 21

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?

Answer 21

Fx= max
ax= Fx/m
ax= 200N/5.00kg
ax= +40.0 m/s2