BM - force in physical activity

Question 1

What does this define, “a force generated by the contraction of skeletal muscle”?

Answer 1

Internal force

Question 2

Define external force

Answer 2

a force that comes from outside the body.

Question 3

What is net force?

Answer 3

the overall force acting on a body when all the individual forces have been considered. (resultant force).

Question 4

Define statics?

Answer 4

the study of bodies that are in a constant state of motion (ie. no acceleration).

Question 5

What is dynamics?

Answer 5

the study of bodies that are changing their state of motion (ie accelerating).

Question 6

What are balanced forces?

Answer 6

when two or more forces acting on a body are equal in size but opposite in direction. The resultant net force is zero.

Question 7

Define unbalanced forces?

Answer 7

when forces acting in one direction is greater in size than a force acting in the opposite direction. The resultant net force is either positive or negative.

Question 8

What is, “the force on a body exerted by the Earth’s attraction”

Answer 8

Weight

Question 9

What is defined as, “the force that attracts a body to the centre of the Earth”.

Answer 9

Gravitational force

Question 10

Define friction force

Answer 10

the force that acts in opposition to the movement of one surface over another.

Question 11

Define air resistance

Answer 11

the force acting in the opposite direction to the motion of a body travelling through the air.

Question 12

Drag/ fluid resistance is defined as…?

Answer 12

the resistance cause by friction in the direction opposite to the motion of a body travelling through a fluid.

Question 13

Normal reaction force is defined as…?

Answer 13

the force between two bodies in contact with each other in a direction perpendicular to the surface of contact (90 degrees).

Question 14

What is, “the product of force multiplied by the time for which the force acts”?

Answer 14

Impluse