Force and Motion Unit

Ms. Adams threw two rocks, one horizontally and one straight up. She watched as both stones fell back down to the ground. Based on what she saw, the best explanation would be that gravity is a force that...

• Pushes up towards the sky

• pushes down towards the earth

• pushes in two directions

• acts in the direction any object move

Mrs. Byrd was testing different surfaces to see which one had the least friction. She predicted that a ball would travel the fastest down a ramp when it was covered with a covering with the least friction. She covered it with hard plastic, pebbles, and tree bark. Then, she sent he ball down the ramp without pushing it.

What were the controlled variables in the experiment?

• ramp height, ball, and using gravity

• the different types of ramp coverings

• how fast the ball moved down the ramp

• pushing or not pushing the ball

Mrs. Miller wants to test how friction affects the speed of a model car. Which surface would mostlikely create the most friction?

• cardstock

• Sandpaper

• shower board

• wax paper

A cart in a Walmart parking lot on top of a hill is pushed down the hill. During the time the cart is going down the hill, it....

• gains both potential and kinetic energy

• loses potential energy and gains kinetic energy

• loses both potential and kinetic energy

• loses kinetic energy and gains potential energy

When the distance between two objects increases, the force of gravity.....

• increases then decreases

• remains the same

• increases

• decreases

Why is an infants car seat made to face the rear of the car?

• It is safer because Newton's first law suggests that the baby will continue to move forward as the car slows and be pushed into the padded car seat.

• It is safer because Newton's first law suggests that the baby will push on the car seat with a force equal and opposite to the own exerted on it.

• It is safer because Newton's first law suggests that the baby will move in the direction they are facing and not get thrown forward

• It is safer because Newton's first law suggests that the baby has a smaller mas and it will feel a smaller force

Why does your body deem t be pushed backwards against the seat when you are sitting in a car that is not moving and then t suddenly accelerates?

• gravity

• vector

• newton

• inertia

What is the force that acts over a distance, can not be seen, and causes like poles to repel and opposite poles attract?

• magnetism

• air resistance

• friction

• gravity

If Mrs. Garrett, Mrs. Ritchie, Mrs. Lewis, and Mrs. Miller were in a race. Mrs. Garrett race speed was 4.1m/s,

Mrs. Ritchie's was 5.3 m/s, Mrs. Lewis was 3.8 m/s, and Mrs. Miller was 3.9 m/s. Who was the fastest teacher?

• Mrs. Garrett

• Mrs. Ritchie

• Mrs. Lewis

• Mrs. Miller

Which of these toy race cars has the slowest speed?

• Car 1 traveling 100 cm in 10 seconds

• Car 2 traveling 200 cm in 10 seconds

• Car 3 traveling 100 cm in 20 seconds

• Car 4 traveling 200 cm in 20 seconds