Physical Science Semester Exam

As Marie Pushes a table to the right, friction between the floor and the table acts toward...

• The right

• Right angles to her push

• The left

• None of the above

When Joan pushes a crate across a level floor at constant velocity, friction between the crate and the floor is

• More than her pushing force.

• Less than her pushing force.

• The same amount as her pushing force.

• None of the above.

If Marie pushes horizontally on a table, but not hard enough to get it moving, the friction force acting on the table is...

• Zero

• Equal and opposite to her push

• Equal to the weigth of the table

• None of the above

Two measurements that are necessary for calculating average speed are...

• Distance and time

• Velocity and time

• Acceleration and time

• Distance and acceleration

A glance at the speedometer in a vehicle will tell you your

• Acceleration

• Instantaneous speed

• Overall speed

• Average speed

A freely falling object has an instantaneous speed of 10 m/s. One second later its speed will be

• 30 m/s

• 10 m/s

• 20 m/s

• more than 30 m/s

When mike sprints 100 yards in 20 seconds, his average running speed is

• 50 Yards/second

• 1/2 Yard/Second

• 5 Yards/second

• not enough information

An object accelerates when it

• Changes in direction of motion

• speeds up

• slows down

• All of the above

Which of these is a vector quantity

• Acceleration

• Force

• Velocity

• All of the above

When a ball rolls down an inclined plane and gains 4 m/s each second of rolling, its acceleration is

• 4 m/s²

• one half of 4 m/s²

• one half of 4 m/s

• 10 m/s²