January exam

Question 1

Velocity

Answer 1

Speed in a certain direction = vector.

Question 2

Displacement
(distance time graphs)

Answer 2

The distance between the start and the end points of a journey in a straight line (the length of the actual journey).

Question 3

What do scalar quantities have?

Answer 3

Magnitude, not direction.

Question 4

Why are forces vector quantities?

Answer 4

Because they have:
- direction
- size (magnitude)

Question 5

Acceleration (vector quantity)

Answer 5

A measure of how fast velocity is changing.

Question 6

Momentum

Answer 6

A combination of mass and velocity (a vector)

Question 7

Examples of vector quantities

Answer 7

• displacement
• velocity
• force

Question 8

Examples of scalar quantities

Answer 8

• speed
• mass
• energy
• weight
• time
• distance

Question 9

Instantaneous speed

Answer 9

The speed of a moving object at one moment in time

Question 10

How do you calculate time?

Answer 10

Distance divided by speed

Question 11

How do you work out speed?

Answer 11

Distance divided by time

Question 12

How do you work out distance?

Answer 12

Speed times time

Question 13

What is the unit for measuring average speed?

Answer 13

Metres per second

Question 14

How are forces represented?

Answer 14

With force arrows
- size indicates the magnitude
- direction indicates which way the force acts

Question 15

How do you work out the resultant force?

Answer 15

You add together the forces acting together in the same direction and subtract forces operating in the opposite direction.

Question 16

What will unbalanced forces do?

Answer 16

Make the object change its speed.

Question 17

What is mass?

Answer 17

• The quantity of matter in an object (the atoms that make up the object)
• Does not change unless the object changes
• Unit = kilograms/grams (scales)

Question 18

What is weight?

Answer 18

• The pull of gravity on an object
• A force = vector, meaning it has a direction (towards the earth’s core)
• Unit = Newtons (N)
• force metre
• weigh changes depending on gravitational pull

Question 19

What is the gravitational field strength on earth?

Answer 19

10 N / kg

Question 20

What is the formula for calculating weight?

Answer 20

Mass x gravitational field strength

Question 21

Formula for average acceleration

Answer 21

a = (v-u)/time (s)
u = initial velocity
v = final velocity

Question 22

How do you work out the gradient in distance time graphs?

Answer 22

Gradient = speed
The speed at any point is equal to the gradient of the line.