Forces and their effects

Question 1

Define Velocity.

Answer 1

Speed in a given direction.

Question 2

Define a resultant force.

Answer 2

One force that replaces many forces.

Question 3

Rearrange F=ma making mass (m) the subject

Answer 3

m=F/a

Question 4

When two bodies interact, what can you say about the size and direction of the action and reaction force?

Answer 4

Equal and opposite

Question 5

What will happen to an object’s motion if the resultant force is zero?

Answer 5

Stay at rest, or continue at a constant velocity

Question 6

What will happen to an objects motion if the resultant force is not zero?

Answer 6

Accelerate or decelerate

Question 7

State the two factors that will affect the acceleration of an object.

Answer 7

size of resultant force, mass of object

Question 8

How do all bodies fall in a vacuum?

Answer 8

With constant acceleration (10m/s2 on Earth)

Question 9

Describe the three phases of what happens to the air resistance on an object as it falls to Earth.

Answer 9

1 - Maximum acceleration, no air resistance. 2 - Acceleration decreases, air resistance increases as speed increases. 3 - The two forces balance, acceleration is zero and terminal velocity reached.