phys practice final 1

When an object's distance from another object is changing

• it is in motion

• it is speeding

• is has a high velocity

• it is accelerating

You can show the motion of an object on a line graph in which you plot distance against

• velocity

• time

• speed

• direction

The rate at which velocity changes is called

• speed.

• direction.

• acceleration.

• motion.

What happens when two forces act in the same direction?

• They cancel each other out.

• The stronger one prevails.

• They add together.

• The sum divided by two is the total force.

The greater the mass of an object.

• the easier the object starts moving.

• the greater its inertia.

• the move balanced it is.

• the more space it take up.

Which of the following is an example of rolling friction?

• your shoes on a sidewalk as you walk

• bike tire 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 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.

Which of the following is an example of increasing friction intentionally?

• waxing skis

• adding grease to gears on a bike

• throwing sand on an icy driveway

• oiling a squeaky door

The force that pulls falling objects toward Earth is called

• gravity.

• free fall.

• acceleration.

• air resistance.