P1&2

Question 1

What is the equation to work out acceleration?

Answer 1

Change in velocity divided by time

Question 2

What is the first equation for wave speed?

Answer 2

Frequency x wavelength

Question 3

What is the equation for efficiency?

Answer 3

useful energy out divided useful energy in

Question 4

What is the common walking speed?

Answer 4

1.4 m/s

Question 5

What is the average speed of sound?

Answer 5

343 m/s

Question 6

What is the average running speed?

Answer 6

4.2 m/s

Question 7

What is a scalar quantity?

Answer 7

Scalers are quantities that are fully described by a magnitude alone

Question 8

What is Newton’s third law

Answer 8

For every action there is an equal and opposite reaction

Question 9

What is the second equation for wave speed?

Answer 9

Distance divided by time

Question 10

What is Newton’s second law?

Answer 10

The greater the mass of an object, the greater the force needed to accelerate the object

Question 11

How do you work out the amount of kinetic energy?

Answer 11

1/2 x mass x (speed)2

Question 12

How do you work out the change in gravitational potential energy?

Answer 12

mass x gravitational field strength x change in vertical height

Question 13

What is the equation to work out average speed?

Answer 13

distance divided by time

Question 14

What is the acceleration due to gravity on Earth?

Answer 14

The acceleration gained by an object because of gravitational force is called its acceleration due to gravity. It is a vector which means it has both a magnitude and a direction.

Question 15

Are speed and temperature vector or scalar quantities?

Answer 15

Scalar

Question 16

Is volume a vector or scalar quantity?

Answer 16

Scalar

Question 17

What is the conservation of momentum?

Answer 17

So long as not any external forces are acting on objects involved the total momentum stays the same in explosions and collisions.

Question 18

Is velocity a vector or scalar quantity?

Answer 18

Vector

Question 19

Is the increase/ decrease in temperature a vector or scalar quantity?

Answer 19

Vector

Question 20

What is a vector quantity?

Answer 20

Vectors are quantities that are fully described by both a magnitude and a direction

Question 21

Is time a vector or scalar quantity?

Answer 21

Scalar

Question 22

What is the equation to work out momentum?

Answer 22

Mass x velocity

Question 23

What is the equation to work out weight?

Answer 23

Mass x gravitational field strength

Question 24

What is the equation to work out force?

Answer 24

Mass x acceleration

Question 25

What is Newton's first law?

Answer 25

An object in motion will stay in motion unless acted upon by an unbalanced force. An object at rest will stay at rest unless acted upon by an unbalanced force.

Question 26

What is resultant force?

Answer 26

All the forces acting on an object added together.

Question 27

What happens when all the forces are balanced?

Answer 27

The resultant force would be zero.

Question 28

What happens when all the forces are balanced?

Answer 28

* an object in motion stays in motion at the same speed and in the same direction * a stationary object stays stationary

Question 29

What happens to an object when the resultant force is not zero?

Answer 29

* a stationary object begins to move in the direction of the resultant force * a moving object speeds up, slows down or changes direction depending on the direction of the resultant force

Question 30

Describe circular motion at a constant speed as a changing velocity and hence as an acceleration...

Answer 30

Since the objects velocity vector is constantly changing direction, the moving object is undergoing acceleration by centripetal force in the direction of the centre of rotation. Without this acceleration, the object would move in a straight line.

Question 31

What is the force needed to keep an object moving in a circular path?

Answer 31

Centripetal force

Question 32

Give an example of an object moving in circular paths and the type of centripetal force involved...

Answer 32

Whirling a conker on a piece of string around in a circle. The centripetal force is the result of tension within the string.

Question 33

What is the difference between weight and mass?

Answer 33

Mass is the amount of material contained in an object. Weight is the force exerted by gravity on that object.

Question 34

List the factors that determine the weight of an object...

Answer 34

The mass of an object and the acceleration due to gravity determine the weight.

Question 35

What is the equation to work out weight?

Answer 35

Mass x gravitational acceleration

Question 36

What is the unit for weight?

Answer 36

Newton's (N)

Question 37

What is an acceleration?

Answer 37

* a vehicles capacity to gain speed * increase in speed or rate * the rate of change in velocity per unit of time

Question 38

List the factors that affect acceleration...

Answer 38

* mass * surface area * acceleration due to gravity

Question 39

What does 'equilibrial situation' mean?

Answer 39

A state of rest or balance due to the equal action of opposing forces.