Physics Practice HWK

A baseball has a mass of 0.145kg, while a softball has a mass of 0.198kg.  If a player throws both balls, assuming the net force acting on both is the same, how will their accelerations differ?  Explain your answer using Newton’s second law.

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NGSS.MS-PS2-2

Match each term with its definition.

• speed

• The speed of an object in a particular direction

• unbalanced forces

• A set of forces on an object that cancel. The combined force in the same as zero force

• velocity

• A measure of how fast something, rate of motion moves

• acceleration

• The rate at which velocity changes over time

• balanced forces

• A set of forces exerted on an object that change the motion of that object

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NGSS.MS-PS3-1

You and your dad are moving the couch from one side to another. Your dad pushes with a force of 35 N to the right and you push with a force of 25 N right. What is the net force on the couch?

• 60 N right
• 10 N left
• 60 n right
• 50 N left

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NGSS.MS-PS2-2

What is the net force?

• 40 N left
• 0 N Balalnced
• 400 N right
• 40 N right

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NGSS.MS-PS2-2

What is the net force?

• 400 N Up
• 400 N Down
• - 400 N Down
• 800 N Down

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NGSS.MS-PS2-2

Choose which are examples of BALANCED forces

• a parked car

• a bungee jumper

• a soccer player ran for the ball and fell

• a car going 60 mph

• angelica throwing a pie at Mr. Estrada

Choose which are examples of UNBALANCED forces

• a parked car

• a bungee jumper

• a soccer player ran for the ball and fell

• a car going 60 mph

• angelica throwing a pie at Mr. Estrada

Tags

NGSS.MS-PS2-2

Jason was designing an experiment to see how fast a toy car could travel down a ramp. Which of the following changes would increase the speed of the car the most?

• decrease the angle of the ramp, increase the mass of the car, and increase the traction between the car’s tires and the surface of the ramp by adding sand paper to the ramp

• increase the angle of the ramp, reduce the mass of the car, and decrease the friction between the car’s tires and the surface of the ramp by spraying cooking oil on the ramp

• decrease the angle of the ramp, reduce the mass of the car, and increase the traction between the car’s tires and the surface of the ramp by adding sand paper to the ramp

• increase the angle of the ramp, increase the mass of the car, and decrease the friction between the car’s tires and the surface of the ramp by spraying cooking oil on the ramp.

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NGSS.MS-PS2-2

A series of laws developed to describe how objects move when forces act upon them are called ​ (a)   .  When the net force of an object is zero, all the forces acting on the object are ​ (b)   and the object ​ (c)   change speed or direction.  If the forces on a object are unbalanced, then the object will change its ​ (d)   .

• Newton's Laws of Motion
• balanced
• will not
• velocity
• will
• unbalanced

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NGSS.MS-PS2-2

A volcanic eruption launches two rocks of different masses into the air.  The first rock had a mass of 10 kilograms while the second rock had a mass of 20 kilograms.  At the eruption, both rocks accelerated at a rate of 600 m/s². Which of the following statements is true regarding the eruption of the two rocks?

• The amount of force applied to rock one was twice as much as the force applied to rock two during the eruption.

• The amount of force applied to rock one was the same as the force applied to rock two during the eruption.

• The amount of force applied to rock one was half the amount of force applied to rock two during the eruption.

• The amount of force applied to the rocks is impossible to determine without knowing the inertia of the rocks

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NGSS.MS-PS2-1

NGSS.MS-PS2-2