Force and Motion

On which surface would a toy car travel the farthest if pushed with the

same amount of force?

• concrete

• carpet

• grass

• ice

Which is the best example of a pushing force that reduces the speed of

an object?

• a skateboard wheel rolling against pavement

• a pedal turning the wheels of a bicycle

• a brake rubbing against a wheel

• a bat hitting a baseball

Four cars are at the starting line of a race. Which car will require the most force to start moving?

• car with a mass of 1200 kilograms

• car with a mass of 1500 kilograms

• car with a mass of 2000 kilograms

• car with a mass of 1700 kilograms

In order for someone to push a heavy box 10 meters across a floor, which must happen?

• The force of the person pushing must be greater than the force of

  friction.

• The force of the person pushing must be less than the force of

  friction.

• The force of the person pushing must be less than the force of

  gravity.

• The force of the person pushing must be greater than the force of

  gravity.

What can cause a moving object to increase its speed in a forward direction?

• a force pushing on the object from the opposite direction

• a force that continually acts on the object in the direction the object is moving

• an increase in the mass of the object

• a decrease in the mass of the object

Gravity on Earth is caused by

• weather patterns on Earth

• the revolution of Earth

• the rotation of Earth

• the mass of Earth

A jet flies in a straight line between two cities that are separated by 620 kilometers.

If it takes 4 hours for the jet to make the trip, what is its average speed?

• 2,480 km/h

• 155 km/h

• 15 km/h

• 1.55 km/h

A submarine traveled 200 miles in one hour. During the next hour, it traveled another 200 miles. Which best describes the average speed of the submarine during the second hour?

• exactly the same as the first hour

• about the same as the first hour

• slower than the first hour

• faster than the first hour

If a boat travels west at 80 mph for 4 hours, what distance will the boat travel? (speed = distance ÷ time)

• 320

• 100

• 84

• 20

A car traveled 60 miles in one hour, while a tour bus traveled 120 miles in two hours. Which best describes the motion of the vehicles? (speed = distance ÷ time)

• They traveled the same distance.

• They traveled at a constant speed.

• They traveled in the same direction.

• They traveled at the same average speed.