Force and motion

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

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

• friction

• acceleration

• inertia

• gravity

Which of the following is an example of rolling friction?

• your shoes on a sidewalk as you walk

• bike tires on the road as you ride

• a boat on the water as it sails

• two hands rubbing together

Air resistance is a type of _____.

• motion

• acceleration

• velocity

• friction

The product of an object’s mass and velocity is called its _____.

• inertia

• momentum

• acceleration

• force

The achievement of lifting a rocket off the ground and into space can be explained by _____.

• Newton’s first law

• Newton’s second law

• Newton’s third law

• The law of conservation of momentum

Any force that causes an object to move in a circle is called a (an) _____.

• balanced force

• unbalanced force

• gravitational force

• centripetal force