Linear Motion

Question 1

What is an internal force?

Answer 1

Force generated by the skeletal muscle

Question 2

What are external forces?

Answer 2

Forces from outside the body

Question 3

What are examples of external forces?

Answer 3

Friction, air resistance and weight

Question 4

When are there reaction forces?

Answer 4

Whenever a body is in contact with another

Question 5

What is a static force?

Answer 5

A force exerted when there is no motion between 2 surfaces

Question 6

What is a sliding force?

Answer 6

When 2 bodies in contact have a tendency to slip/slide over

Question 7

What is friction affected by?

Answer 7

• Roughness of the surface

• The mass of the object

• Temperature of the 2 surfaces

Question 8

What is air resistance dependant on?

Answer 8

• Velocity of the moving body

• Frontal cross-sectional area of the moving body

• Shape and surface characteristics of the moving body

Question 9

What is impulse?

Answer 9

The time taken for a force to be applied

Question 10

What kind of force causes linear motion?

Answer 10

Concentric force