Motion

Two cars are in motion for the same amount of time. What will determine which car covers more distance?

• the starting position of the each car
• the speed of each car
• the direction in which each car moves
• the length of the car

A car is driven for 3 hours. What else do you need to know to describe this car’s speed?

• the road the car in driven on
• the time of day
• the distance the car is driven
• the number of passengers in the car

What is speed?

• how much an object’s position changes
• how far an object moves
• how long an object moves
• how far an object moves in a certain amount of time

The position of a runner in a race changes as time passes. What could a reference point to describe the change in position? 

• the starting line
• the runner’s speed
• the runner’s right foot
• another runner

Wind pushes a toy sailboat across a pond. The boat moves in a straight path. What is changing?

• the boat’s direction
• the boat’s path
• the wind’s direction
• the boat’s position

When two equal and opposite forces are at work, what happens to motion?

• It increases
• It decreases.
• There is no motion.
• There is maximum friction.

What is the speed of a runner who runs 400 meters in 40 seconds? (speed = distance ÷ time)

• 10 meters/second
• 40 meters/second
• 100 meters/second
• 1,600 meters/second

Which best describes the speed of a ball as it is thrown straight up into the air and comes back down?

• The ball goes up at a constant speed, stops, then comes down at a constant speed.
  The ball goes up at a constant speed, stops, then comes down at a constant speed.
• The ball goes up at a constant speed, stops, and increases speed as it comes down
• The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
  e
• The ball goes slower and slower as it goes up, stops, and then comes down at a constant speed.The ball goes slower and slower as it goes up, stops, and then comes down at a constant speed.

a push or pull that can change the position or motion of an object / material

• Friction

• Force

• Gravity

• Magnetism

a force that acts in an opposite direction to movement

• Friction

• Force

• Gravity

• Magnetism