A 3000-N force gives an object an acceleration of 15 m/s squared. The mass of the object is ____

• 45,000 kg

• 1,500 kg

• 200 kg

• 15 kg

Which of the following is an example of exerting a force?

• a child running through a field

• a train speeding down a track

• a carpenter hammering a nail

• an airplane soaring through the sky

What happens when two forces act in the same direction?

• They cancel each other out

• The stronger one prevails

• They add together

• Their sum divided by two is the total force

The tendency of an object to resist change in its motion is known as ____

• mass

• inertia

• force

• balance

The greater the mass of an object

• the easier the object starts moving

• the greater its inertia

• the more balanced it is

• the more space it takes up

One way to increase acceleration is by

• increasing mass

• decreasing mass

• decreasing force

• increasing both force and mass proportionally

The force that one surface exerts on another when the two rub against each other is called

• friction

• acceleration

• inertia

• gravity

When the only force acting on a falling object is gravity, the object is said to be

• stationary

• decelerating

• in free fall

• a projectile

Air resistance is a type of

• motion

• acceleration

• velocity

• friction

The force of gravity on a person or object at the surface of a planet is known as

• mass

• inertia

• air resistance

• weight