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WorksheetsGrade9 second week
Total questions: 34
Worksheet time: 23mins
Write the scientific term:
A method used by physicists to predict the mathematical relation between physical
quantities
(a)
A bus starts from rest and reaches 20 m/s in 5 seconds. Its acceleration is ………
2 m/s²
4 m/s²
5 m/s²
10 m/s²
Two cars move towards each other. One with speed 40 km/h and the other with 60 km/h. Their relative speed is ………
20 km/h
40 km/h
60 km/h
100 km/h
A body covers 100 m in the 1st 10 seconds, and 200 m in the next 10 seconds. Its motion is ………
Uniform
Non-uniform
Constant
Relative
A car increases its velocity from 20 m/s to 40 m/s in 10 seconds. What is its acceleration?
1 m/s²
2 m/s²
3 m/s²
4 m/s²
Which quantity describes rate of change of velocity?
Speed
Acceleration
Force
Distance
If acceleration = 0, motion is ………
Uniform
Accelerated
Decelerated
Vibratory
If speed is constant, acceleration is ………
Positive
Negative
Zero
Infinite
Speed measures how fast a body ………
Changes velocity
Moves
Accelerates
Stops
Acceleration measures how fast ………
Speed changes
Distance changes
Time changes
Mass changes
If a runner covers 100 m in 12 s, his average speed = ………
8 m/s
8.3 m/s
9 m/s
12 m/s
A car moves 300 m in 20 s and 200 m in next 10 s. Average speed = ………
15 m/s
20 m/s
60 km/hr
16.7km/hr
A car travels 120 km in 2 h and 60 km in 1 h. Average speed = ………
40 km/h
50 km/h
60 km/h
70 km/h
Two cars move in opposite directions at 30 km/h and 40 km/h. Their relative speed is ………
10 km/h
30 km/h
40 km/h
70 km/h
A curved line in distance-time graph shows ………
Uniform speed
Accelerated motion
Body at rest
Constant speed
A straight horizontal line on speed -time graph means ………
Body is at rest
Body has constant speed
Body is accelerating
Body is decelerating
Which graph represents uniform motion?
Straight line distance-time
Curved distance-time
Zigzag line
Vertical line
If velocity is constant, acceleration is ………
Positive
Negative
Zero
Infinite
A car increases its velocity from 0 to 20 m/s in 10 s. Its acceleration is ………
1 m/s²
2 m/s²
4 m/s²
5 m/s²
Acceleration = change in ……… ÷ time
Distance
Speed
Force
Mass
Which of the following is a non-uniform motion?
Train moving at 60 km/h constantly
A car slowing down at traffic lights
Earth revolving around Sun
A person walking 5 km/h
A horizontal line in a distance-time graph means ………
The body is moving
The body is at rest
The body is accelerating
The speed is changing
Distance-time graph helps us to find ………
Acceleration
Force
Speed
Mass
If a car covers 200 km in 4 hours, its average speed is ………
25 km/h
40 km/h
50 km/h
80 km/h
Motion is described by ………
Force and mass
Distance and time
Weight and energy
Speed and acceleration
Two cars move in opposite direction with the speed 100 km per hour for each so the speed of the second car as estimated by the driver of the first car equal zero
True
False
An observer in a moving car with 80 km/h was observing a moving car with 90 km/h in the same direction, so the observed speed of the second car is ................. km/h.
10
170
Complete :
(a) is the change of an object position as time passes according to the position of another fixed object .
Complete :
(a) is the speed of a moving object relative to a constant or a moving observer .
It is the speed by which the object moves when it covers equal distances at equal periods of time
Irregular (non-uniform)
Positive uniform acceleration
Regular (uniform) speed
Motion
Physicists use other mathematical relations like graphs and tables in order to :
Predict the relation between certain physical quantities .
Understand practical results.
Describe the physical phenomena in an easier way.
All the previous
It is the rate of change of speed.
Acceleration
Average speed
Relative speed
Scalar Physical quantity
It is the speed of a moving object relative to a constant or a moving observer
(a)
It is the regular speed by which the object moves to cover the same distance at the same period of time.
(a)
