Exercise 3 Science about "Forces"

Mass is a measure of ….

• how much matter makes up an object

• the effect of gravity on the object

• the size of the force

• how much force on the object

The weight of an object is a measure of ….

• how much matter makes up an object

• the effect of gravity on the object

• the size of the force

• how much force on the object

Weight can measured in the unit ….

• meters

• celcius

• newton

• kilograms

Mass can measured in unit ….

• meters

• celcius

• newton

• kilograms

The theory of gravity was discovered by ….

• Albert Einstein

• Thomas Edison

• Isaac Newton

• Graham Bell

Look at the picture!

We can use an … to measure mass.

• forcemeter

• electronic balance

• thermometer

• microscope

Why do apples fall to the Earth?

• because of the gravitational force that pulls the apple towards the center of the Earth

• because of the friction force that makes the apple fall to the ground

• because of the lift force that makes the apple float in the air

• because apples are lighter than air

A mass of one … has a weight of 9,8 newtons on Earth.

• meters

• kilogram

• newton

• celcius

Look at the picture!

The car moves at the same speed when the thrust is balanced by the ….

• lift

• gravity

• drag

• pull

Look at the picture!

An object will … if the weight is equal to or less than the upthrust.

• sink

• float

• fly

• all answers are correct