Force & Motion

After throwing a basketball through the net, Anna observed the ball as it hit the ground. Which is most likely responsible for the ball hitting the ground?

• friction

• gravity

• mass

• speed

A car is traveling at a speed of 75 miles per hour. If the car travels for 60 minutes, how many miles did the car travel? (speed = distance ÷ time)

• 5 miles

• 75 miles

• 15 miles

• 135 miles

Jose was driving to New York City. He traveled 100 miles in the first hour of the trip and 20 miles in the last hour of his trip. Which can we say about Jose’s drive? (speed = distance ÷ time)

• Jose drove less than 120 miles.

• Jose drove faster the first hour of his drive.

• Jose drove slower the first hour of his drive.

• Jose drove the same speed for the entire drive.

Greg’s family is planning a trip, and want to choose the method of transportation that travels with the most speed. Which should Greg’s family choose? (speed = distance ÷ time)

• a bus traveling 60 km every two hours

• a car traveling 60 km every four hours

• a train traveling 120 km every four hours

• a plane traveling 120 km every two hours

A 30 gram ball rolls along a flat surface at a constant speed in the same direction over 4 meters in 20 seconds. Which is the speed of the ball? (speed = distance ÷ time)

• 0.2 meters per second

• 0.5 meters per second

• 20 meters per second

• 80 meters per second

1. Chris climbs onto a skateboard ramp halfway between the top and the bottom of the ramp. Because gravity acts on Chris, which is most likely to happen?

• He won’t move.

• He will roll up the ramp.

• He will roll down the ramp.

• He will float above the ramp.

2. How fast was a train moving if it traveled 100 meters in 10 seconds? (speed = distance ÷ time)

• 1 meter per second

• 10 meters per second

• 90 meters per second

• 100 meters per second

Ana is pushing a wheelbarrow of rocks. She stops and unloads half of the rocks. How will this effect the force needed to move the wheelbarrow?

• Gravity is increased, making the wheelbarrow easier to move.

• Gravity is decreased, making the wheelbarrow harder to move.

• Friction is increased, making the wheelbarrow harder to move.

• Mass is decreased, making the wheelbarrow easier to move