Motion

Question 1

What is weight?

Answer 1

Weight is a force that acts towards the centre of the earth, it’s a vectors

Question 2

What are vectors?

Answer 2

Quantities that have both a size and a direction

Question 3

What is mass?

Answer 3

Mass measures the amount of matter in something and does not have a direction

Question 4

What are examples of scalar quantities?

Answer 4

Distance, speed, energy, mass

Question 5

What is displacement?

Answer 5

Displacement is the distance covered in a straight line and has a direction. The displacement at the end of a journey is usually less than the distance travelled because of the turns or bends in a journey

Question 6

Name some vectors

Answer 6

Force, weight, displacement, acceleration, momentum

Question 7

What does the speed of an object tell you?

Answer 7

It tells you how far it moves in a certain time, velocity

Question 8

What is acceleration

Answer 8

A measure of how fast velocity is changing

Question 9

What is momentum?

Answer 9

A combination of mass and velocity

Question 10

What are some common units for speed?

Answer 10

Metres per second (m/s)
Kilometres per hour (Km/h)
Miles per hour (mph)

Question 11

What is average speed worked out from?

Answer 11

From the total distance travelled and the total time taken

Question 12

What is the instantaneous speed?

Answer 12

The speed at a particular point in a journey

Question 13

How can speed be calculated?

Answer 13

Speed = distance ➗ time taken

Question 14

To measure speed in the laboratory you need to measure a distance and a time, for fast moving objects what would you use?

Answer 14

Light gates to measure time because they will be more accurate then using a stop watch

Question 15

What do the characteristics mean on a distance/time graphs?

Answer 15

Horizontal lines mean the object is stationary (it’s distance from the starting point is not changing)
Straight, sloping lines mean the object is travelling at a constant speed
The steeper the line, the after the object is travelling
The speed is calculated from the gradient of the line

Question 16

If a moving object changes its velocity or direction, what happening?

Answer 16

It’s accelerating

Question 17

What does acceleration tell you?

Answer 17

It tells you the change in velocity each second, so the units of acceleration are metres per second written as m/s to the power of 2

Question 18

How do you work out acceleration?

Answer 18

Acceleration = change in velocity ➗ time taken

Question 19

What does v mean?

Answer 19

Velocity

Question 20

What does a mean?

Answer 20

Acceleration

Question 21

What does u mean?

Answer 21

Initial velocity

Question 22

What does t mean?

Answer 22

The time take for the change in velocity

Question 23

Acceleration does not always mean getting faster. An acceleration can also cause an object to get slower. What is this called?

Answer 23

Deceleration, the acceleration will have a negative value

Question 24

Acceleration can be related to initial velocity, final velocity and distance travelled by using what equation?

Answer 24

V squared - u squared = 2 ✖️ a ✖️ X

Question 25

Explain acceleration due to gravity?

Answer 25

An object in free fall is moving downwards because of the force of gravity acting on it. If there are no forces (such as air resistance), the acceleration due to gravity is 9.8 m/s squared. This is represented by the symbol g, and is often rounded to 10 m/s squared in calculations

Question 26

What do all forces have?

Answer 26

A magnitude and a direction and measured in newtons

Question 27

What do the characteristics on a velocity time graph mean?

Answer 27

A horizontal line means the object is travelling at a constant velocity
A sloping line shows that the object is accelerating. The steeper the line the greater the acceleration. If the line slopes down to the right, the object is decelerating
A line below the horizontal axis means a negative velocity which shows the object moving in the opposite direction
You can find the acceleration of an object from the gradient of the line

Question 28

What is the area under a velocity time graph?

Answer 28

The distance the object gas travelled (distance is calculated by multiplying a velocity and a time)

Question 29

Go to p9

Answer 29

And look at the velocity time graph