Physics Term 1 + Term 2

Question 1

What is a scalar quantity?

Answer 1

A quantity hat only has magnitude and isn’t direction dependent.

Question 2

What is a vector quantity?

Answer 2

A quantity that has both a magnitude and an associated direction.

Question 3

How can a vector quantity be represented?

Answer 3

Using vector arrows.

Question 4

How do vector arrows represent vectors?

Answer 4

• The length of the arrow represents the magnitude.
• The arrow points in the associate direction.

Question 5

Give three examples of vector quantities?

Answer 5

• Velocity
• Displacement
• Force

Question 6

Give examples of scalar quantities.

Answer 6

• Temperature
• Time
• Mass
• Speed
• Distance
• Energy

Question 7

What is velocity?

Answer 7

The speed of an object in a specific direction.

Question 8

Give an equation relating average speed, distance and time.

Answer 8

average speed = distance / time

Question 9

On a distance / time graph, what value does the gradient of the line represent.

Answer 9

The spee.

Question 10

On a displacement / time graph, what value does the gradient of the line represent?

Answer 10

The velocity

Question 11

What must be done to calculate speed at a given time from a distance - time graph for an accelerating object?

Answer 11

• Draw a tangent to the curve at the required time.
• Calculate the gradient of the tangent.

Question 12

State the equation for the average acceleration of an object. Give appropriate units.

Answer 12

Acceleration (m/s^2) = (Change in velocity) (m/s) / (Time taken) (s)

Question 13

Give an equation relating final velocity with initial velocity, displacement and acceleration.

Answer 13

v^2 = u^2 + 2as

Question 14

How can the distance travelled by an object be calculated from the velocity - time graph?

Answer 14

It is equal to the area under the graph.

Question 15

On a velocity / time graph what does the gradient represent?

Answer 15

The acceleration.

Question 16

State a typical value for the speed of sound.

Answer 16

330 m/s

Question 17

What is a typical value for human walking speed?

Answer 17

1.5 m/s

Question 18

What is a typical value for human running speed?

Answer 18

3 m/s

Question 19

What is a typical value for human cycling speed?

Answer 19

6 m/s

Question 20

Give an approximate value for the acceleration of an object in free fall under gravity near the Earth’s surface.

Answer 20

10 m/s^2

Question 21

What is the name given to the single force that is equivalent to all the other forces acting on a given object?

Answer 21

The resultant force.

Question 22

State Newton’ first law for a stationary object.

Answer 22

If the resultant force on a stationary object is zero, the object will remain at rest.

Question 23

State Newton’s first law for a moving object.

Answer 23

If the resultant force on a moving object is zero, the object will remain at constant velocity (same speed in same direction).

Question 24

State the defining equation for Newton’s second Law.

Answer 24

Resultant force = Mass X Acceleration

F = MA

Question 25

State Newton's second law in words.

Answer 25

An objects acceleration is directly proportional to the resultant force acting on it and inversely proportional to its mass.

Question 26

What is weight?

Answer 26

The force the acts on an object due to gravity and the object's mass.

Question 27

What quantities does weight depend on?

Answer 27

Weight = Mass X Gravitational field strength - The object's mass. - The gravitational field strength at the given position in the field.

Question 28

What is the unit used for weight?

Answer 28

The Newtons (N).

Question 29

What is the unit used for gravitational field strength?

Answer 29

N/Kg