Force and Motion Review

Which of these is a good example of Newton's First Law of inertia

• a ball sits motionless on the ground

• a ball gathers speed as it rolls downhill

• a ball accelerates as it falls out of the classroom window

• a ball slows down after it is kicked through the grass

Tommy was walking at a rate of 4 mph at noon and at 12:30 pm he was walking at a brisk rate of 6 mph. Two hours later Tommy was walking at a leisurely rate of 2 mph. Which statement about Tommy's acceleration is true?

• Tommy had an accleration of zero the entire time.

• Tommy had a positive acceleration between noon and 12:30 pm.

• Tommy had a positive acceleration between 12:30 and 2:30 pm.

• Tommy had a negative acceleration between noon and 12:30 pm

Jane and Jim are gardening with their mother. Their job is to bring her a large bag of soil. The bag is very heavy and Jim is pulling on it, dragging it to the garden. They want to complete their chore quickly so they can play video games. Which technique would be MOST helpful in increasing the acceleration of the bag of soil?

• Jane pulls the bag to the garden.

• Jim pushes the bag to the garden.

• Divide the soil into two bags and Jane and Jim both drag a bag.

• Lift the bag onto a skateboard and push the bag with the same force.

Tags

NGSS.MS-PS2-2

A wheelbarrow is experiencing two forces. One is pushing 5 N to the east and the other 5 N in the exact opposite direction. What must be true of the wheelbarrow's motion?

• It is moving.

• It is accelerating

• It is slowing down.

• It isn't accelerating

Tags

NGSS.MS-PS2-2

An object in motion will stay in motion unless acted upon by what type of force?

• balanced

• electrical

• magnetic

• unbalanced

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NGSS.MS-PS2-2

In a bumper car arena, two cars of equal mass are heading straight toward each other. The orange one is traveling at a speed of 5 meters per second. The green one is traveling at a speed of 2 meters per second. Which car will continue moving in its original direction, and at what speed?

• green, at 2 meters per second

• green, at 3 meters per second

• orange, at 2 meters per second

• orange, at 3 meters per second

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Two forces are acting on a wheelbarrow. One force is pushing to the right and an equal force is pushing to the left. What can you say about the wheelbarrow's movement?

• It is slowing down.

• It is not accelerating.

• It is moving faster and faster.

• Its speed is changing at a constant rate.

Tags

NGSS.MS-PS2-2

Brad and Erin decide to have a tug of war contest. Erin pulls the rope with all her might and so does Brad. Sadly, Brad only pulls with half the force that Erin pulls with. Sarah is watching and waiting for her turn. Since the forces are unbalanced the rope will move towards Erin. Using Newton's first law of motion as a model, explain how Brad could keep from losing the tug of war.

• Ask Erin to let go of the rope.

• Make the rope longer so Brad can get a better grip.

• Let Sarah, who pulls just as hard as Brad, team up with him to pull the rope together.

• Let Sarah, who pulls just as hard as Brad, team up with Erin to pull the rope together.

Tags

NGSS.MS-PS2-2

Bobby is riding his bike down the road at a speed of 10 miles per hour. Ahead of him, he sees another rider, moving in the same direction. Bobby is catching up with the rider ahead of him. What is the estimated speed of the other rider?

• The same speed as Bobby's.

• Much faster than 10 mph.

• Slower than 10 mph.

• About 5 mph.

Meghan and Rachel each have bowling balls with the same mass. They both roll them as hard as they can and then measure the speed of each ball. Meghan rolls her ball exactly half as fast as Rachel. How do the forces the two girls applied to their balls differ?

• Rachel used half the force that Meghan did.

• Rachel used twice the force that Meghan did.

• Meghan used twice the force that Rachel did.

• Without knowing the mass of the balls, we can not say.

Tags

NGSS.MS-PS2-2