Chapter 3-5 Test 😈

When you mix boiling water with jelly powder, the mixture is a liquid. In the fridge it becomes solid. Can we make jelly change back to a liquid?

• Yes

• No

A solution is a pure substance.

• TRUE

• FALSE

When you stand still, why don't you sink into the ground?

• That's because there is a pressure force that the earth exerts on your feet pushing you up! Gravity down and pressure up and hence you can stand still and not accelerate because the sum of gravity down and pressure up equals zero.

• You may not think this, but when you're standing ont he floor, you are excerting a force against the floor: your weight, caused by gravity, is pulling you down. The floor is reacting by pushing back: we call this force the reaction force.

• We are able to move because attached to our skeleton (or skeletal system) is our muscular system! When these two systems work together, they make up the musculoskeletal system. The muscular system is made up of muscles, joints, tendons, and ligaments.

Which is the right spelling for the following force:

• Gravlty

• Gravitty

• Gravllt

• Gravlty

• gravity

How can we reduce forces?

• Make the object more streamlined.

• Increasing the mass of the object that is causing friction.

• By applying more force to the object.

• By creating a rougher point of contact.

Which symbol is this?

• Open ended switch

• Buzzer

• Motor

• Bell

Which symbol is this?

• Buzzer

• Motor

• Bell

• Open Switch

Which is Bell?

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• 
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• PRESS THIS TO TEST YOUR LUCK AS YOU HAVE A 50/50 CHANCE OF IT BEING RIGHT!

What is the right meaning for this symbol?

• Bell

• Closed Switch

• Buzzer

• None of the above

Which is the 3V battery symbol?

• 
•