Forces and Pressure

1.Two boys A and B are shown applying force on a block. If the block moves towards the right, which one of the following statements is correct?

• i) Magnitude of force applied by A is greater than that of B.

• ii) Magnitude of force applied, by A is smaller than that of B

• iii) Net force on the block is towards A

• iv) Magnitude of force applied by A is equal to that of B

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

2. During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is

• force of gravity

• electrostatic force

• Force of friction

• magnetic force

Tags

NGSS.MS-PS2-3

3. Which one of the following forces is a contact force?

• Magnetic force

• Force of gravity

• Force of friction

• Electrostatic force

4. Two objects repel each other. This repulsion could be due to the

• Frictional force only

• either a magnetic or an electrostatic force

• Magnetic force only

• electrostatic force only

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

5. The force acting on a unit area is ___________.

6. When two forces act in opposite directions, then net force will be____________.

Tags

NGSS.3-PS2-1

7. Force acting on an object may change________.

Tags

NGSS.MS-PS2-2

8. Assertion (A): Water begins to flow towards the ground as soon as we open a tap. /Reason (R): It is because of force of gravity, which makes things/objects fall towards the earth as it pulls them.

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

9. Assertion (A): The relationship between force, pressure and are is given by P=F/A. / Reason (R): The SI unit of pressure is N/m2 or Pascal (Pa).

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true

10. Assertion (A): Fountains of water comes out of the leaking joints or holes in pipes. / Reason(R): It is because liquids (water) exerts pressure on the walls of the pipes.

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true