Acceleration

Question 1

What is a acceleration?

Answer 1

Acceleration is defined as the rate of change of velocity.

Question 2

What is the formula for acceleration?

Answer 2

Change in velocity/ Time Taken

Question 3

When is an object said to accelerating?

Answer 3

When it’s velocity increases.

Question 4

What is uniform acceleration?

Answer 4

If an object’s speed (velocity) is increasing at a constant rate then we say it has uniform acceleration

Question 5

Acceleration like velocity is a _____ quantity

It has magnitude and direction.

Answer 5

Vector

Question 6

What is non-uniform acceleration?

Answer 6

It means that the acceleration is not constant.

Question 7

A positive or negative value of acceleration refers to its ______ and not whether the object is speeding up or slowing down. The object speeds when the direction of acceleration is in the same direction as the _____ of the object.

Answer 7

Direction

Motion

Question 8

How do you change the velocity of an object?

Answer 8

If one wants to change the velocity of an object one must apply a force which will produce a resultant force on the object. This force can be either a push or a pull.
Force is a vector quantity and therefore has both magnitude and direction. The unit of force is the Newton (N).

Question 9

In the case of a resultant force the vector sum of all the forces acting on an object must produce an _____ force. It is this resultant force which causes a change in
state of motion of an object as defined in _____ ____ ____ _____.

Answer 9

overall force

Newton’s First Law of Motion

Question 10

For a stationary object to start moving it must experience a resultant force which causes _____.

Answer 10

Acceleration

Question 11

True or false

Once an object is moving however, it no longer requires a force to keep it moving.

Answer 11

True

Question 12

What is the common mistake made with objects moving at constant velocity?

Answer 12

The reality is that an object moving at constant velocity has no resultant force acting on it. Where friction is present, an applied force is required so as to balance the frictional force, thereby maintaining movement at constant velocity. (When the resultant force on an object is zero (i.e. the forces balance), then the velocity of the object remains constant. When there is a resultant force, the object will accelerate.)