Which statement correctly compares his motion during the first 10 minutes to his motion during the last 10 minutes?
• He is going slower and in a different direction during the first 10 minutes than in the last 10 minutes.
His acceleration increases during the first 10 minutes and decreases during the last 10 minutes.
He is speeding up during the first 10 minutes and slowing down during the last 10 minutes.
• He is going faster and in a different direction during the first 10 minutes than in the last 10 minutes.
The correct statement is:
• He is going faster and in a different direction during the first 10 minutes than in the last 10 minutes.
What does a horizontal line on a position-time graph indicate about the object? (1 point)
• The object has a position of zero.
• The object is accelerating.
• The object has a constant, nonzero velocity.
O The object remains still.
The correct answer is:
• The object has a constant, nonzero velocity.
A force acts on an obiect. Which option describes an action that could prevent the object from moving? (1 point)
a force applied in the opposite direction with the same magnitude at the same time
a force applied in the opposite direction with the same magnitude at the same time
a force applied in the opposite direction with a greater magnitude at the same time
a force applied in the same direction with a greater magnitude at the same time
The correct answer is:
a force applied in the opposite direction with a greater magnitude at the same time.
Which option is the force with the greatest magnitude? (1 point)
the force needed to lift a textbook
the force needed to lift a chair
the force needed to lift a pencil
the force needed to lift a hairbrush
The correct answer is:
the force needed to lift a chair.
A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force?
(1 point)
No, this is not an example of a force because the box did not move.
O Yes, this is an example of a force because a force is a push or pull.
Yes, this is an example of a force because gravity is pulling the box down.
• No, this is not an example of a force because a force pulls an object.
The correct answer is:
Yes, this is an example of a force because a force is a push or pull.
Which situation describes a non-contact force changing the speed of an object? (1 point)
• a drawer opening when a user pulls the handle
• a bicycle accelerating as the rider pedals more quickly
• a ball accelerating as it rolls down a hill
• a gust of wind blowing a leaf away
The correct answer is:
• a gust of wind blowing a leaf away.
What’s this answer
The answer is:
• a gust of wind blowing a leaf away.
In which situation would the momentum of a moving object increase? (1 point)
A force acting in the direction of the object's motion is removed from the object.
• Two forces of equal magnitude act on the object in opposite directions.
A force acting in the direction opposite the object's motion is removed from the object.
O A new force acts on the object, opposing the object's motion.
The situation in which the momentum of a moving object would increase is:
A new force acts on the object, opposing the object's motion.
When you trip, your foot stops, but your body continues to move forward. Which statement best explains why this happens?
(1 point)
• The unbalanced force that stops your foot pulls your body forward.
An unbalanced force pushes your body forward.
An unbalanced force stops your foot but does not act on the rest of your body.
• Newton's Second Law of Motion pushes your body forward after your foot stops.
The statement that best explains why your body continues to move forward when you trip is:
• The unbalanced force that stops your foot pulls your body forward.
A bowler throws a ball down the lane toward the pins. The ball reaches the pins and slowly moves through them, knocking down the center pins but leaving the end pins standing. The bowler wants the ball to reach all the pins. Which changes should the bowler make so that the ball has a greater acceleration? (1 point)
The bowler should choose a ball with less mass or throw the ball with more force.
The bowler should choose a ball with less mass or throw the ball with less force.
The bowler should choose a ball with more mass or throw the ball with less force.
) The bowler should choose a ball with more mass or throw the ball with more force.
To increase the acceleration of the ball and have a better chance of reaching all the pins, the bowler should make the following change:
The bowler should choose a ball with less mass or throw the ball with more force.