Unit 2 Quiz Review

2.1.1

Match the following terms with a good description of them

• Theory

• An explanation of why observed patterns happen

• Law

• A prediction based on past evidence and experimentation

• Hypothesis

• An observable and measurable truth.

• Fact

• A description of what effect will happen because of a given cause

Answer explanation

This question links to success criteria 2.1.1: I can differentiate between a hypothesis, theory and law and understand the importance of each.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.1.1

Match the following ideas with why they are important to science

• Theory

• By observing this we gain the information we need to ask good questions and test our ideas.

• Hypothesis

• By learning this we can connect observed cause and effect relationships to bigger ideas and predict outcomes from similar events.

• Law

• By forming this we gain a starting point to conduct an experiment and learn more.

• Fact

• By using this we can reliably predict the outcome to specific events.

Answer explanation

This question links to success criteria 2.1.1: I can differentiate between a hypothesis, theory and law and understand the importance of each.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.1.2

Is there an outside force acting to create the motion you see in the animation?

• The object's speed does not change, so there is no force

• The direction the object moves is changing, there must be an outside force.

• The center of the object doesn't move, so there is no outside force.

• The object is above the ground, there is a downward force.

Answer explanation

This question links to success criteria 2.1.2: I can determine whether an outside net force is acting upon an object based on its motion.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.1.2

What best describes the balance of forces (net force) acting on the barbell while the weightlifter holds it steady (at rest) above his head?

• The object is not in motion, so there the forces are balanced.

• It is heavy, so the downward force must be stronger.

• It is heavy but he is strong, so the upward force must be stronger

• It you push and pull at the same time it will move to the side.

Answer explanation

This question links to success criteria 2.1.2: I can determine whether an outside net force is acting upon an object based on its motion.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.1.2

A student is running at 5 m/s in a straight line.The student ​ (a)   accelerating because their velocity ​ (b)   changing. By the 1st Law, this means the net force ​ (c)   zero.

• is
• isn't

Answer explanation

This question links to success criteria 2.1.1: I can differentiate between a hypothesis, theory and law and understand the importance of each.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.1.2

A stone's weight pushes down on the earth but neither the stone or the earth moves. The objects ​ (a)   accelerate because they ​ (b)   start moving. By the 1st Law, this means there ​ (c)   be a balancing force to keep the net force zero.

• does
• don't
• mustn't
• must

Answer explanation

This question links to success criteria 2.1.1: I can differentiate between a hypothesis, theory and law and understand the importance of each.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.2.2

Watch as Blake begins to run. What happens to the sheets of paper under his feet? Why?

Mira como Blake comienza a correr. ¿Qué pasa con las hojas de papel bajo sus pies? ¿Por qué?

• Blake runs so fast that the paper appears to move backwards but actually stays still

• When Blake moves forward, the air moved into the space he had been and pushes the paper around.

• When Blake pushes backwards on the paper the paper pushes forward on him. The paper moves backward and Blake moves forward.

• Newton was wrong.

Answer explanation

This question links to success criteria 2.2.2: I can use Newton’s 3rd Law to explain how common motion examples work.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.2.2

When you jump up, you push the earth downwards. Why does this cause you to move upwards?

• You don't move upwards, you stay where you are and push the earth down. The earth isn't standing on anything so it easily moves.

• The question is wrong because you can't push the earth downwards. To jump you pull yourself upwards.

• Don't overthink it. it just works.

• When you push down on the earth it pushes back up on you. The upward force of the earth in reaction to your downward push makes you move up.

Answer explanation

This question links to success criteria 2.2.2: I can use Newton’s 3rd Law to explain how common motion examples work.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.2.2

A person steps out of the boat and onto the dock. As the person moves forward onto the dock, the boat moves backward. Which statement best describes the backward motion of the boat as the person steps forward?

• The backward motion of the boat is the reaction to the action of the person stepping onto the dock.

• The mass of the person exerts a force on every other mass.

• An object at rest tends to stay at rest.

• Friction opposes the motion of an object.

Answer explanation

This question links to success criteria 2.2.2: I can use Newton’s 3rd Law to explain how common motion examples work.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

2.3.1

Which of the following best describes how Newton's second law predicts what will happen to the acceleration of an object when the mass of an object increases?

• If the mass increases the object will accelerate more.

• If the mass increases the object's acceleration will not change.

• The acceleration should decrease when the mass increases

• If the mass increases, the force increases as well.

Answer explanation

This question links to success criteria 2.3.1: I can describe the relationship between net force, mass and acceleration.

If you got it correct place a check mark in the question results section. If you got it incorrect place an X in that section. If this was a redemption question, cross out the one X and replace it with a check mark.

Tags

HS-PS2-A-1