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