Newton's Laws and Levers

Question 1

fulcrum

Answer 1

The fixed point on which a lever rests and on which it pivots

Question 2

parts of a lever

Answer 2

lever arm, fulcrum, load, effort (force)

Question 3

lever arm

Answer 3

The perpendicular distance from the fulcrum to the line of action of the force

Question 4

two main functions of a lever

Answer 4

Levers increase the resistance that a given force can move

Levers increase the speed at which a body moves.

Question 5

Class 1 Lever Example

Answer 5

The triceps - elbow joint

Question 6

Class 2 Lever Example

Answer 6

The calf - ankle joint

Question 7

Class 3 Lever Example

Answer 7

The biceps-elbow joint

Question 8

What distinguishes between the three classes of lever?

Answer 8

arrangement of the muscles insertion (effort) and bones (lever/arm) around the joint (fulcrum)

Question 9

Newton’s 1st Law

Answer 9

objects in motion continue their motion or objects at rest stay at rest until acted upon by an unbalanced force

Question 10

Example of Newton’s 1st law

Answer 10

soccer ball stays at rest until it is kicked

Question 11

Newton’s 2nd Law

Answer 11

the force applied to an object is equal to its mass times the acceleration of the object (force = mass x acceleration)

Question 12

Example of Newton’s 2nd law

Answer 12

140 lb lineman and 250 lb lineman collide, both experience the same force but smaller lineman will have a greater acceleration out of the collision because of his small mass

Question 13

Newton’s 3rd Law

Answer 13

For ever action there is an equal and opposite reaction

Question 14

Example of Newton’s 3rd law

Answer 14

A tennis racket applies force to a tennis ball and the ball applies the same force back to the racket

Question 15

force

Answer 15

an influence that can change the motion of an object

Question 16

velocity

Answer 16

change in displacement/time

Question 17

displacement

Answer 17

change in position from one place to another

Question 18

Why is displacement a vector quantity?

Answer 18

it has size and direction

Question 19

acceleration

Answer 19

change in velocity/time (it takes for the change)

Question 20

momentum

Answer 20

the quantity of motion of a moving body, measured as a product of its mass and velocity

Question 21

impulse

Answer 21

a force acting briefly on a body and producing a finite change of momentum

Question 22

center of mass

Answer 22

The point around which mass is evenly distributed, determines balance point