Motion P9

Question 1

How to calculate the speed of an object?

Answer 1

v=s/t

distance divided time

Question 2

How to calculate the distance of an object travelling?

Answer 2

s=v * t

speed multiply time

Question 3

How to calculate the time of an object travelling?

Answer 3

t=s/v

distance divided by speed

Question 4

What does v stand for and its unit?

Answer 4

speed (m/s)

Question 5

What does s stand for and it’s units?

Answer 5

distance (m)

Question 6

What does t stand for and the units?

Answer 6

time (seconds)

Question 7

The steeper the gradient…

Answer 7

…the greater the speed.

Question 8

The distance-time graph for any object is stationary(1)

moving at a constant speed(2):

Answer 8

Stationary = horizontal line.

Moving at constant speed = straight line that slopes upwards.

Question 9

What does the gradient of a distance-time graph represent?

Answer 9

Speed

Question 10

What is the speed of a runner who covers 400m in 50s?

Answer 10

8 m/s

Question 11

Vector meaning?

Answer 11

A physical quantity that has a direction as well as a magnitude. Eg 20N to the left.

Question 12

Define Scalar.

Answer 12

A physical quantity that has a magnitude only and does not have a direction. Eg 20N

Question 13

What is the displacement of an object?

Answer 13

The distance travelled in a given direction.

Question 14

Define velocity of an object.

Answer 14

Object’s speed in a given direction.

Question 15

What is the difference between speed and velocity?

Answer 15

Speed is scalar and velocity is vector.

Question 16

Unit for acceleration.

Answer 16

m/s to the power of 2

Question 17

What does a positive gradient and an negative gradient represent on a velocity-time graph?

Answer 17

A positive gradient represent positive acceleration and negative gradient represent deceleration.

Question 18

if a velocity-time graph is a horizontal line the acceleration is…

Answer 18

…zero AND at constant velocity.

Question 19

What does the gradient on a velocity-time graph represent?

Answer 19

Acceleration.

Question 20

What does an upwardly curving line represent on a distance-time graph?

Answer 20

Increasing speed.

Question 21

What does an upwardly curving line represent on a velocity time graph?

Answer 21

Increasing acceleration.