GRADE VIII Physics Live Class Revision

Pressure decreases when the surface area over which a force is applied increases.

• True

• False

When you increase your depth under water, the water pressure on your body:

• increases

• decreases

• stays the same

What is force?

• A push exerted on an object
• A push or pull exerted on an object
• A pull exerted on an object
• Nothing

Tags

NGSS.MS-PS2-1

Watch the tyres of tractor rolling. Rear tyres are broader because

• It looks good.

• Broader tyres lessen the muscular Force required.

• Broader tyres lessen the pressure on ground.

• Broader tyres lessen the friction on ground.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-PS2-2

Let's say that the box in the picture will move. And it will move in the right direction. This is happening because-

• Both the men are pushing it towards right.

• Both the push and pull are in the opposite direction.

• Both the push and pull are in the same direction.

Which of the following is an example of friction that is helpful?

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

Friction is an example of _____________

• contact force

• non contact force

• both of these

• none of these