10 grade

The driver of car increases his velocity from 10 m/s to 18 m/s in 4s.

Find the acceleration?

• 4 m/s2

• 8 m/s2

• 2 m/s2

• 6 m/s2

Finf the velocity of the bus,relative to the car?

• 70 m/s

• 10 m/s

• 30 m/s

• 40 m/s

A car goes around a curve at 20 m/s. If the radius of the curve is 50 m, what is the centripetal acceleration of the car?

• 8 m/s2

• 30 m/s2

• 25 m/s2

• 2 m/s2

The drum of a washing machine rotates 1200 times in 1 minute.

a) What is the frequency of the drum?

• 0.05Hz

• 20 Hz

• 1200 Hz

• 1 Hz

The drum of a washing machine rotates 1200 times in 1 minute.

a) What is the period of the drum?

• 10 s

• 5 s

• 0.05 s

• 20 s

Formula of the centripetal acceleration

How many degrees in 1 radian?

A body stay at rest or moves with constant velocity,unless an eternal force makes it behave differently.

Name of law?

• 2nd Law of Newton

• 1st law of Newton

• 3rd law of Newton

• Gravotational law

• 10 N

• 2.5N

• 15 N

• 25 N

Force which always perpendicular to the plane?

• Friction force

• Equal force

• Elastic force

• Normal force