motion (P2.1)

Question 1

what do you use light gates for

Answer 1

measuring very short periods of time.

Question 2

timer

Answer 2

starts and stops when an object interrupts a light beam

Question 3

ultrasound

Answer 3

high frequency sound waves which is used to measure distance. The device measures the time taken for a pulse to travel there and back. It uses this value, and the speed of the pulse, to work out the distance.

Question 4

Distance travelled (M) formula

Answer 4

Distance(M)= Speed(M/S) X Time (S)

Question 5

Average speed (M/S)

Answer 5

Total distance (M) / Total time (S)

Question 6

SI unit

Answer 6

The SI unit of distance is the metre and the SI unit of time is second.

Question 7

Converting mph to m/s

Answer 7

1. Convert the miles to metres
2. Convert hours to seconds
3. Divide both of your answers in the formula:

speed= Distance/Time

Question 8

vector

Answer 8

a quantity that has a magnitude and a force

Question 9

Scalar

Answer 9

a physical quantity that has magnitude but no direction

Question 10

Displacement

Answer 10

the moving of something from its place or position.

Question 11

Velocity

Answer 11

the speed of an object in a particular direction

Question 12

Acceleration

Answer 12

The change in velocity per second

Question 13

acceleration formula ( Method 1)

Answer 13

Acceleration= Change in velocity (M/S)/Time(S)

Question 14

acceleration formula (Method 2)

Answer 14

final velocity-initial velocity/time

Question 15

Gradient on a graph

Answer 15

The speed an object is moving according to the graph.

Question 16

Calculating speed from a graph formula

Answer 16

1. Draw a right angled triangle under the line
2. From the triangle, find the change in distance and change in time
3. Use the equation for speed to find the answer.

Question 17

Calculating velocity from a graph formula

Answer 17

1. Draw a right angled triangle under the line
2. Find the change in displacement and the change in time from the triangle.
3. Use the equation for velocity to find the answer.

Question 18

What can we deduce from a gradient of a graph

Answer 18

The gradient of any graph with time on the x-axis tells you about the rate of change with time. The rate of change of speed or velocity with time tells you the acceleration.

Question 19

How do you calculate distance travelled

Answer 19

multiply speed and time

Question 20

Calculating displacement from graphs

Answer 20

1. Identify triangles or rectangles that you can use to calculate the displacement.
2. Read the lengths from the graph and use them to calculate the area.
3. Calculate the total displacement

Question 21

Calculating velocity

Answer 21

1. Write down the values you know already
2. Make the final velocity the subject of the equation
3. Calculate the final velocity

Question 22

Equation of motion

Answer 22

Final velocity-initial velocity= 2X acceleration X distance

Question 23

Calculating kinetic energy

Answer 23

Kinetic energy= 0.5 X mass X speed

Question 24

Calculating speed from kinetic energy

Answer 24

1. Write what you know and estimate the mass
2. Make speed the equation of the equation
3. Calculate the speed.