Forces and their effects

Question 1

What is the resultant force?

Answer 1

The resultant force is the term used to describe the result of all forces acting upon an object.

Question 2

What happens when all forces on an object are balanced?

Answer 2

The object has no resultant force. It is stationary or is moving at a constant speed.

Question 3

What happens when the forces on an object are not balanced?

Answer 3

The object accelerates in the direction of the resultant force.

Question 4

What is the relation between acceleration, force and mass?

Answer 4

force = mass x acceleration

Question 5

What is the relation between speed, distance travelled and time?

Answer 5

distance travelled = speed / time

Question 6

How do you calculate acceleration?

Answer 6

acceleration = (final velocity - initial velocity)

Question 7

How do you calculate the overall distance travelled from a velocity-time graph?

Answer 7

Calculating the area beneath the graph.

Question 8

How do you calculate stopping distance?

Answer 8

stopping force = thinking distance + braking distance

Question 9

What are the 3 factors affecting thinking distance?

Answer 9

Being:

1. Tired
2. Distracted
3. Under the influence of alcohol or drugs

Question 10

What are the three stages of falling?

Answer 10

1. Acceleration downwards.
2. Air resistance increases to match acceleration.
3. Eventually two forces balance, terminal velocity is reached.

Question 11

What is the equation that links weight, mass and gravitational field strength?

Answer 11

weight = mass x gravitational field strength

Question 12

What is Hooke’s law?

Answer 12

force = spring constant * extension

The extension of an elastic object is directly proportional to the force applied to it.