Forces

Question 1

What is a contact force?

Answer 1

A force that acts when an object is in contact with a surface, air or water. Example: air resistance, friction, water resistance etc…

Question 2

Is friction greater on a rougher or smother surface?

Answer 2

Rougher.

Question 3

Define streamlined

Answer 3

A contour designed to minimise resistance to motion through a fluid.

Question 4

What is hooke’s law?

Answer 4

If the extension doubles when you double the force, that object obeys Hooke’s Law. Not all object obey Hooke’s Law.

Question 5

Does atmospheric decrease or increase with height?

Answer 5

Decrease.

Question 6

What is a drag force?

Answer 6

The force that slows down object if they are moving through a fluid.

Question 7

What is an elastic limit?

Answer 7

When a spring doesn’t go back to its original length after you have removed force.

Question 8

What is the law of moments?

Answer 8

When an object is an equilibrium the sum of the clockwise moment equal to the sum of the anti-clockwise moment.

Question 9

How to calculate moment?

Answer 9

Clockwise Moment (Nm) = force (N) x perpendicular distance from the pivot (m)

Question 10

How to calculate pressure?

Answer 10

Pressure (N/m2) = force (N)/ area (m2)