Unit 2 Test Review

2.1.1

Match the following terms with a good description of them

• Law

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

• Theory

• A prediction based on past evidence and experimentation

• Hypothesis

• An explanation of why observed patterns happen

• Fact

• An observable and measurable truth.

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

• Hypothesis

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

• Law

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

• Fact

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

• Theory

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

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 race car is going around a corner on its race track.

The car ​ (a)   accelerating because it ​ (b)   ​changing direction. 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 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

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

How does a rocket accelerate out in space where it has nothing to push against?

• The rocket pushes super hot gas backwards, the reaction pushes it forwards

• The rocket makes fire which can create force without a reaction force

• It is not possible to accelerate in space

• Rocket is never alone, he always has Groot

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.

2.2.1

A player throws a ball. Which of the following correctly describes the applied and reaction forces?

• The player pushing on the ball is the applied force. The ball pushing on the player is the reaction force.

• The ball pushing on the player is the applied force. The player pushing back on the ball is the reaction force.

• The player's hand moving is the applied force. The ball moving is the reaction force.

• The player pushing on the ball is the applied force. The wind pushing on the ball is the reaction force.

Answer explanation

This question links to success criteria 2.2.1: I can identify action and reaction forces.

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.