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Test Unit 1.2 and 2 Oct 18 2019 Phy-1

Last updated over 6 years ago

34 questions

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Question 28

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Question 29

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Question 30

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Question 31

31.

Choose the correct answer and show your work!!!

Question 32

32.

SHOW YOUR WORK!!!!!!!!

Question 33

33.

A body of mass 2.0 kg (initially at rest) slides down a curved path of total length 22 m. The body starts from a vertical height of 5.0 m from the bottom. When it reaches the bottom, its speed is measured and found to equal 6.0 ms-1.
a) Find the energy lost in the friction.
b) Assuming the force to have constant magnitude, determine the magnitude of the force of friction exerted by the work of friction.

Question 34

34.

Choose the correct answer and show your work.

Remember that this type of graph has two times, one to stop the object and another for changing the direction of it.

First row

Second row

Third row

Fourth row

First row

Second row

Third row

Fourth row

2 mv Cos ø

2 mv Sin ø

zero

mv

  In inelastic collision...

neither momentum nor kinetic energy are conserved.

kinetic energy is conserved but momentum is not.

momentum is conserved but kinetic energy is not.

momentum and kinetic energy are both conserved.

First row

Second row

Third row

Fourth row

Remember in this type of graph, there is a time for stopping the object and another for changing the direction.

B

D

C

A

The momentum of a particle stays constant provided that

it moves in a circle with constant speed.

the net external force acting on it is zero.

the net internal force acting on it is zero.

its acceleration is uniform.

15N

25 N

30 N

45 N

1st row

2nd row

3rd row

4th row

A

B

C

D

First row

Second row

Third row

Fourth row

A

B

C

D

What does the area under the line represent in Force - distance graph?

Impulse

Work done

Spring constant

acceleration

800 N

500 N

300 N

250 N

If the mass of the car is 1,000 kg, how much is the force of the engine  (thrust)?

300 N

500 N

800 N

1000 N

If an object is sliding down at constant speed with friction. Find the magnitude of F.

W Cos ø

R Cos ø

W Sin ø

R Sin ø

If an object is sliding down at constant speed with friction. Find the magnitude of R.

W Cos ø

R Cos ø

W Sin ø

R Sin ø

1st figure

2nd figure

3rd figure

4th figure

1st figure

2nd figure

3rd figure

4th figure

1st figure

2nd figure

3rd figure

4th figure

The time taken for a stone dropped from rest to fall vertically through 16 m is 2.0 s. Based on these measurements, what is the best estimate for the acceleration of free fall?

2 ms-2

4 ms-2

8 ms-2

9.81 ms-2

d1 / t1

∆d / t1

Gradient of tangent at P

The shaded area

Which graph shows the velocity when we have a constant net force in a system starting from rest.

A

B

C

D

Which graph shows the velocity when we have a constant net force in a system when there already an initial velocity of the object.

A

B

C

D

Find the change in velocity:

16 ms-1

12 ms-1

8 ms-1

4 ms-1

D

C

B

A

A

B

C

D

A

B

C

D

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D