Smithfield Force & Motion

Which investigation will best test the effects of gravity on moving objects?

• pencils falling from the same height

• balloons floating upward from the same height

• a bicycle speeding up on a flat surface

• a ball slowing down on a flat surface

A weight, suspended from a pole, is held in place as shown. When the weight is released, it moves in the direction shown. Which of these would cause the weight to move in this direction?

• electric force

• magnetic force

• friction

• gravity

A train travels 150 miles in 2 hours. What is the average speed of the train? (average speed = distance ÷ time)

• 30 miles per hour

• 50 miles per hour

• 75 miles per hour

• 150 miles per hour

The speed of a bowling ball is found to be 3 meters per second. How far would the bowling ball roll in 10 seconds? (speed = distance ÷ time)

• 5 meters

• 15 meters

• 30 meters

• 60 meters

When pushed with the same amount of force across a desk, which toy car would most likely travel the fastest?

• a car weighing 25 grams

• a car weighing 15 grams

• a car weighing 50 grams

• a car weighing 10 grams

A soccer player kicks a soccer ball across a field. Which factor has the most effect on the distance the soccer ball travels?

• the color of the ball

• the force of the kick

• the length of the field

• the temperature of the air

A book is being pushed across a table. If an equal force is applied to the book in the opposite direction, which will most likely be the result?

• The book will increase in speed.

• The book will decrease in speed.

• The book will fall off the side of the table.

• The book will continue moving at the same speed.

Which must happen for a moving car to change direction?

• The car must slow down.

• Gravity must act on the car.

• The mass of the car must change.

• Another force must act on the car.

How would the absence of friction affect a marble traveling on a long, straight path?

• The marble’s speed would decrease.

• The marble’s speed would increase.

• The marble would stop immediately.

• The marble would remain at constant speed.

What keeps the Earth in orbit around the Sun?

• inertia of the moon

• location of earth’s orbit

• speed of Earth’s rotation

• Sun’s gravitational pull