Motion

Question 1

Is speed a vector or a scalar?

Answer 1

Speed is a scalar quantity: size only (magnitude)

Question 2

Is velocity a vector or a scalar?

Answer 2

Velocity is a vector quantity: size (magnitude) and direction

e.g. +10m/s = velocity of 10m/s to the right (due east)
-10m/s = velocity of 10m/s to the left (due west)

Question 3

Is acceleration is vector or a scalar?

Answer 3

Acceleration is a vector quantity: magnitude and direction.

Question 4

Velocity

Answer 4

Speed in a given direction

Question 5

What does the distance-time graph for an object at a constant speed look like?

Answer 5

A straight line that slopes upwards.

Question 6

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

Answer 6

Speed

Question 7

Speed in m/s =

Answer 7

Distance travelled in m
_____________________
Time taken in s

Question 8

Displacement

Answer 8

Distance in a certain direction.

Question 9

Vector

Answer 9

A physical quantity that has a direction and a magnitude.

Question 10

Scalars

Answer 10

A physical quantity that has a magnitude only and not a direction.

Question 11

Examples of Scalars

Answer 11

Speed
Distance
Time
Mass
Energy
Power

Question 12

Examples of Vectors

Answer 12

Force
Momentum
Weight
Gravitational Field Strength
Acceleration
Velocity

Question 13

Acceleration

Answer 13

An objects change of velocity per second.

Question 14

Acceleration m/s(2) =

Answer 14

Change in velocity m/s
_____________________

Time taken s

Question 15

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

Answer 15

Acceleration

Question 16

What does the distance-time graph of a stationary object look like?

Answer 16

A horizontal line

Question 17

What does the area underneath a velocity/time graph represent?

Answer 17

Distance travelled.

Question 18

How to find the gradient of a distance-time graph
(speed)

Answer 18

Draw a triangle under the line.
gradient of the line= height of the triangle/ base of the triangle (rise/run)

Question 19

Practical for measuring distance:

Answer 19

> Measure out a distance
Station someone at either end.
1st student gives a signal as the vehicle passes
Second student starts timing.
Stop timing when vehicle passes.
Calculate speed as distance/time

Question 20

How to find the gradient of a velocity -time graph
(acceleration)

Answer 20

The height of the triangle under the line/ base of the triangle under the line
(acceleration = change of velocity/ time taken)
(rise/run)

Question 21

How force changes an objects motion

Answer 21

A force applied to an object may cause it to accelerate, decelerate or come to complete rest

Question 22

Force formula

Answer 22

Force = Mass x acceleration

F=ma

Question 23

Circular motion

Answer 23

With circular motion the acceleration is toward the center of the circle

Question 24

Size of the perpendicular force is affected by:

Answer 24

*Mass of object
*Speed of object
*Radius of the circle (Smaller the radius greater the force)

Question 25

Acceleration V-U meaning

Answer 25

V>Final velocity
U>Initial velocity

Question 26

In a velocity-time graph area beneath the graph is _______

Answer 26

distance