unit 2 first quizz

When you move something away from you, this represents..........................

• pushing force

• light energy

• pulling force

• sound energy

the bus that covers 60 km in 1 hour has a speed = 60 m/sec.

• true

• false

 

It is the force that is exerted when objects rub against each other................................

• gravitational force

• friction force

• pulling force

engineers use…………………….. To slow down the motion of the shockwave truck.

• parachute          

• handbrake                      

•   three jet engines

one of the measuring units of time………………….

• hour               

• metre                      

• kilometre                       

• m/sec.

The speed affects the……………………. energy of a moving object.

• potential

• kinetic

• light

in the electric bell,…………………….. Energy changes into…………………. Energy

• sound, light                 

• electric, sound      

•             heat, electric

The friction between the cars' tyres and the road increases the car's speed.

• true

• false

the force that pulls objects toward the center of the earth...........................

• gravitational force

• pulling force

• pushing force

which of the following sentences describes the friction force........................

• it pulls objects towards the ground

• it pushes objects away from the ground

• it slows down or stops the moving objects