Unit 3 Review

The engine of a car with a mass of 1,500 kg is exerting a force of 4,500 N. What is the acceleration of the car?

• 0.33 m/s²

• 3 m/s²

• 500 m/s²

• 6,750,000 m/s²

Tags

NGSS.MS-PS2-2

Which change could cause an apple hanging from a tree branch to fall?

• loss of mass

• loss of weight

• removal of gravitational force

• removal of the upwards force opposing gravity

Tags

NGSS.MS-PS2-4

A large safe falls from a window 30 m above the ground. Gravity exerts a downward force of 2,000 N on the safe, causing it to accelerate at 10 m/s². What is the mass of the safe?

• 200 kg

• 3,000 kg

• 20,000 kg

• 60,000 kg

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Engineers are trying to calculate what size engine to put in a sports car that has a mass of 1,200 kg so that it can accelerate at a rate of 5 m/s². Which force does the engine need to exert to reach the engineers’ goal?

• 48 N

• 240 N

• 6,000 N

• 30,000 N

Tags

NGSS.MS-PS2-2

A force of 75 N acts on an object with a mass of 3.0 kg. What amount of mass would need to be ADDED to the object in order for the same force to cause it to accelerate at a rate of 15 m/s²?

• 2.0 kg

• 5.0 kg

• 12 kg

• 45 kg

Tags

NGSS.MS-PS2-2

A student is experimenting with the elastic band rocket shown here. The rocket has a mass of 0.1 kg. They observe the flight of the rocket when the elastic is stretched to different lengths. This, they reason, will cause the rocket to have different initial accelerations. Using a spring scale hooked to the elastic band, the student found the initial force on the rocket to be 10 N. What was the initial acceleration of the rocket?

• 1.0 m/s²

• 10 m/s²

• 100 m/s²

• 1,000 m/s²

Tags

NGSS.MS-PS2-2

A student is experimenting with the elastic band rocket. The rocket has a mass of 0.1 kg. They observe the flight of the rocket when the elastic is stretched to different lengths. This, they reason, will cause the rocket to have different initial accelerations. Using a spring scale hooked to the elastic band, the student found the initial force on the rocket to be 10 N. The student wants to increase the initial acceleration to 150 m/s². What amount of initial force should the student allow the elastic band to exert?

• 15 N

• 67 N

• 225 N

• 1,500 N

Tags

NGSS.MS-PS2-2

Look closely at the graph. Which measuring devices were used to collect the data plotted on this graph?

• balance and clock

• spring scale and balance

• meter stick and stopwatch

• yardstick and thermometer

An index card is placed across the top of a drinking glass. A coin is then placed on top of the index card. A student quickly flicks the card sideways off the glass. Which scientific law explains why the coin falls into the glass rather than moving to the side with the index card?

• first law of motion

• second law of motion

• third law of motion

Scientists design an unmanned spacecraft that will collide with a meteor to break it into smaller pieces so the meteor will cause less damage if the meteor hits the moon’s surface.

Which statements describe how Newton’s third law of motion is used to describe what happens when the meteor and the spacecraft collide? Circle TWO correct answers.

• The speeds of the meteor and spacecraft will be equal.

• The force of the spacecraft will be exerted onto the meteor at a right angle.

• The accelerations of the meteor and spacecraft will be equal to each other.

• The forces exerted by the meteor and the spacecraft on each other will be of equal strength.

• The forces of the meteor and spacecraft will be exerted on each other in opposite directions.

Tags

NGSS.MS-PS2-1