Answers FL-2002040-MJ Comprehensive Science 1 CRUnit Test

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Which will a positively charged object attract?

an object that has a negative charge

an object that has a smaller positive charge

an object that has no charge

an object that has a larger positive charge

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Which statement correctly describes gravity?

an attractive force that acts between all objects through contact

an attractive force that acts between all objects without contact

a repulsive force that acts between all objects through contact

a repulsive force that acts between all objects without contact

An object that is made of which material is likely to be attracted to a magnet?

nitrogen

nickel

paper

plastic

Which statement correctly describes Earth’s magnetic field?

A compass can lead a hiker to the geographic North Pole.

The magnetic pole near the South Pole is a north pole.

Compasses point toward a magnetic pole that is a north pole.

Field lines circle Earth from east to west.

Tisa makes a diagram to organize her notes about charging objects.

Electrons move between objects.

The objects do not touch.

The objects develop opposite charges.

The objects have the same charge.

Newton’s first law of motion was a giant leap forward in scientific thought during Newton’s time. Even today, the idea is sometimes difficult at first for people to understand.

A rolling ball eventually slows down and comes to a stop.

A wagon must be pushed before it begins to move.

The heavier the load in a cart, the harder the cart is to turn.

A box does not move when pushed equally from opposite sides.

Which example best represents balanced forces?

an elevator stopped on the third floor

a basketball shot into a hoop

a sled sliding down a snowy hill

a tow truck pulling a car out of a ditch

Which refers to the force that one massive object exerts to attract another object?

velocity

gravity

acceleration

newton

A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton’s laws of motion to explain the skydiver’s motion?

An upward force balances the downward force of gravity on the skydiver.

The skydiver’s inertia is zero, which no longer allows for acceleration.

An unbalanced force pulls the skydiver toward the ground.

The mass of the skydiver is so great that there is no acceleration.

Which refers to the sum of all the forces that act upon an object?

absolute force

net force

positive force

balanced force

The image shows the electric field lines around two charged particles.

Which would be represented by FN on a force diagram?

Northern Force

Newton Force

Normal Force

Negative Force

The resulting net force of an object is represented below. →10 NWhich most likely represent the forces acting on the object?

↑ 63 N and ↓ 73 N

↑ 97 N and ↓ 87 N

← 63 N and → 73 N

← 97 N and → 87 N

How does increasing the distance between charged objects affect the electric force between them?

The electric force increases because the distance has an indirect relationship to the force.

The electric force increases because the distance has a direct relationship to the force.

The electric force decreases because the distance has an indirect relationship to the force.

The electric force decreases because the distance has a direct relationship to the force.

When discussing Newton’s laws of motion, which terms do people most likely use when talking about Newton’s third law of motion?

“force” and “acceleration”

“inertia” and “force”

“action” and “reaction”

“mass” and “inertia”

Which change will cause the gravitational force between a baseball and a soccer ball to increase?

removing the outer layer of the baseball

moving the balls farther apart

wrapping the soccer ball in layers of duct tape

using a baseball with a thinner leather

An object in projectile motion will follow which path?

curved up from the ground

curved down toward the ground

straight down toward the ground

straight up from the ground

An object has a mass of 5 kg. What force is needed to accelerate it at 6 m/s2? (Formula: F=ma)

0.83 N

1.2 N

11 N

30 N

A bar magnet is cut in half, as shown. Which shows the pieces after the magnet is cut?

2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled N S from left.

2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N S from left and on the right a piece labeled S N from left.

2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled N and on the right a piece labeled S.

2 pieces of broken magnet with a jagged edge on the inside side of each piece. On the left a piece labeled S and on the right a piece labeled N.

How are the magnetic field lines near the south pole of a magnet affected when a second south pole is brought near it?

The field lines combine with the lines around the second south pole.

The field lines overlap with the lines from the second south pole.

The field lines bend toward the second south pole.

The field lines bend away from the second south pole.

Which statement best compares the accelerations of two objects in free fall?

The heavier object has a greater acceleration.

The object that has the greater surface area has the lower acceleration.

The object that has the smaller mass has the greater acceleration.

The objects have the same acceleration.

What is the weight, on Earth, of a book with a mass of 1.5 kg?

1.5 N

6.5 N

11.3 N

14.7 N

What is the only force that can act on an object in free fall?

gravity

friction

air resistance

speed

An electroscope is a device that detects charge on objects that touch it or are brought near it. John rubs a piece of cotton fabric on a plastic rod and then touches the rod to the electroscope.

John charges the rod through induction, then charges the electroscope through friction.

John charges the rod through conduction, then charges the electroscope through induction.

John charges the rod through friction, then charges the electroscope through induction.

John charges the rod through friction, then charges the electroscope through conduction.

A ball is thrown forward at 5 m/s.

The ball would follow a curved path on Earth but a straight path on the moon.

The ball would follow the same curved path on Earth as on the moon.

The ball would curve down more sharply on Earth than on the moon.

The ball would curve down on Earth but curve up on the moon.

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