I cant do number 28. 1425. A car which is initially at rest rolls down a Asmooth inclined plane as shown below.Which of the speed-time graphs best representsthe motion of the car?A speedB speedC speedCA frictionC weight4020-time26. A heavy-laden trolley in a supermarket is difficultto start from rest and difficult to stop while it ismoving. This is due to itsB inertiaD0+time11 20D speed27. The following graph represents two objects Aand B in a state of linear motion. Which one ofthe following statements is correct?velocity/m s-13momentum4 5B0-Atimetime/stimeBA B overtakes A at the end of the third second.B overtakes A at the end of the fifthsecond.In the first three seconds, the averagespeed of B is greater than that of A.DIn the first five seconds, the average speedof B is greater than that of A.( )All About Physics: Multiple-Choice Questions Workout 'O' level28. A car slides down an inclined surface PQ andmoves horizontally along QS. QR is a roughsurface whilst PQ and RS are frictionless.Between which of the following points onits path does the object move with constantspeed?A P and QCR and SwoleAC29. On which of these slopes does the ball rolldown with increasing speed and decreasingacceleration? (Neglect frictional forces)v/m ssmooth surface16.rough surface smooth surfaceRein aS8930. The figure below shows the acceleration-timegraph of an object, moving towards the right.a/m s-2A2C v/m s¹168:8:aB Q and RDQ and SWhich of the following curves correctly showsthe velocity-time graph of the object?AB24 t/sB24 t/sDD24v/m s16-168v/m s-1-t/st/s-t/s

Answered: Image /qna-images/answer/c3cbd71f-7f8a-441f-aa55-4977d68d9269.jpg

A car slides down an inclined surface PQ and moves horizontally along QS. QR is a rough surface whilst PQ and RS are frictionless. Between which of the following points on its path does the object move with constant speed? P A P and Q CR and S smooth surface rough surface smooth surface R S 0 B Q and R DQ and S

A car slides down an inclined surface PQ and moves horizontally along QS. QR is a rough surface whilst PQ and RS are frictionless. Between which of the following points on its path does the object move with constant speed? P A P and Q CR and S smooth surface rough surface smooth surface R S 0 B Q and R DQ and S

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.

Question

I cant do number 28.

14
25. A car which is initially at rest rolls down a A
smooth inclined plane as shown below.
Which of the speed-time graphs best represents
the motion of the car?
A speed
B speed
C speed
C
A friction
C weight
40
20-
time
26. A heavy-laden trolley in a supermarket is difficult
to start from rest and difficult to stop while it is
moving. This is due to its
B inertia
D
0
+time
1
1 2
0
D speed
27. The following graph represents two objects A
and B in a state of linear motion. Which one of
the following statements is correct?
velocity/m s-1
3
momentum
4 5
B
0
-A
time
time/s
time
B
A B overtakes A at the end of the third second.
B overtakes A at the end of the fifth
second.
In the first three seconds, the average
speed of B is greater than that of A.
D
In the first five seconds, the average speed
of B is greater than that of A.
( )
All About Physics: Multiple-Choice Questions Workout 'O' level
28. A car slides down an inclined surface PQ and
moves horizontally along QS. QR is a rough
surface whilst PQ and RS are frictionless.
Between which of the following points on
its path does the object move with constant
speed?
A P and Q
CR and Swole
A
C
29. On which of these slopes does the ball roll
down with increasing speed and decreasing
acceleration? (Neglect frictional forces)
v/m s
smooth surface
16.
rough surface smooth surface
R
ein a
S
89
30. The figure below shows the acceleration-time
graph of an object, moving towards the right.
a/m s-2
A
2
C v/m s¹
16
8:
8:
a
B Q and R
DQ and S
Which of the following curves correctly shows
the velocity-time graph of the object?
A
B
24 t/s
B
24 t/s
D
D
24
v/m s
16-
16
8
v/m s-1
-t/s
t/s
-t/s

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Step 1: Recall properties of smooth and rough surfaces

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Step 2: Find nature of motion of car on path PQ

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Step 3: Find nature of the speed on path QR and RS

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