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# DSE Physics - PowerPoint PPT Presentation

DSE Physics . Mechancis. constant speed. 12 N. 2 N .

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### Mechancis

12 N

2 N

A block on a rough horizontal surface is moving to the left with constant speed under two horizontal forces 2 N and 12 N indicated as shown. If the force of 12 N is suddenly removed, what is the net force acting on the block at that instant ?

v /m s−1

4

3

Q

2

1

t /s

P

0

1 2 3 4 5

−1

−2

Two particles P and Q start from the same position and travel along the same straight line. The figure shows the velocity-time (v-t) graph for P and Q. Which of the following descriptions about their motion is/are correct ?

(1) At t = 1 s, P changes its direction of motion.

(2) At t = 2 s, the separation between P and Q is 4 m.

(3) At t = 4 s, P and Q meet each other.

154 N

Y

ground

X

0.5 m

0.7 m

What is the reaction acting on the wheel X from the ground ?

I

I

I

I

A

B

### Assessment

• very careful in doing calculations

• eager to investigate deep into questions and difficult concepts

• able to associate day-to-day phenomena with physics

• prepared to work very hard to solve a lot of problems

• willing to accept challenges and won’t easily give up

To become a good student in physics, you have to be