Final exam

Speed is the $\text{\_\_\_\_\_\_}$ travelled by an object per unit time.

distance

An object in $\text{\_\_\_\_\_\_}$ motion moves at a constant speed in a fixed direction.

uniform

A car that is braking is an example of $\text{\_\_\_\_\_\_}$ motion.

non-uniform

A $\text{\_\_\_\_\_\_}$ diagram is used to show all the forces acting on an object.

free-body

Laboratory instrument used to measure the size of a force is called a spring $\text{\_\_\_\_\_\_}$.

balance

The standard international unit of force is $\text{\_\_\_\_\_\_}$.

newton

Magnetic force and force of gravity are examples of $\text{\_\_\_\_\_\_}$ forces.

non-contact

Forces that allow an object to stay at rest or in uniform motion are $\text{\_\_\_\_\_\_}$ forces.

balanced

The amount of matter an object contains, which is constant in different places is called $\text{\_\_\_\_\_\_}$.

mass

The force of gravity of the Earth acting on an object is its $\text{\_\_\_\_\_\_}$.

weight

An object of mass 1 kg has a weight of only 1.6 N on the $\text{\_\_\_\_\_\_}$.

moon

$\text{\_\_\_\_\_\_}$ is a contact force that opposes the motion of objects between two surfaces.

Friction

Opposing force that increases when an object moves faster in air is $\text{\_\_\_\_\_\_}$ resistance.

air

To reduce friction, we can separate surfaces by adding $\text{\_\_\_\_\_\_}$ or an air cushion.

lubricants

High-speed trains use a $\text{\_\_\_\_\_\_}$ shape to minimize fluid resistance.

streamlined

Action and reaction forces are always equal in $\text{\_\_\_\_\_\_}$ but opposite in direction.

magnitude

Vinegar contains $\text{\_\_\_\_\_\_}$ acid, while citrus fruits contain citric acid.

ethanoic

Acids taste sour, while alkalis have a $\text{\_\_\_\_\_\_}$ taste and a slippery feel.

bitter

Acids can change the color of blue litmus paper to $\text{\_\_\_\_\_\_}$.

red

The measurement scale for the acidity or alkalinity of a substance is called the $\text{\_\_\_\_\_\_}$ scale.

pH

A reusable instrument that measures the pH value more accurately than pH paper is a pH $\text{\_\_\_\_\_\_}$.

meter

Neutralization is a chemical reaction between an acid and an alkali to form $\text{\_\_\_\_\_\_}$ and water.

salt

In the stomach, excess acid can be treated by taking a tablet called an $\text{\_\_\_\_\_\_}$.

antacid

Farmers often add an alkali like calcium hydroxide to regulate the pH value of $\text{\_\_\_\_\_\_}$.

soil