AP 1 1st Half Review

Sam is hover boarding down they hall at a constant velocity. Assuming there is friction, which of the following must be true?

• The force applied by the board must be greater than the frictional force

• The frictional force must equal the force applied by the board

• The force applied must equal zero

• There is not enough information

Camille launches has a catapult that changes the velocity of a ball (m= 2 kg) from 0 to 10 m/s in one sec. What is the average force that is exerted on the ball during launch?

• 20 N

• 5 N

• 8 N

• 0.2 N

What is happening between 3 seconds and 4 seconds?

• The object is moving in a negative direction.
• The object is returning to its starting position.
• The object is slowing to a stop.
• The object is changing direction.

"If we apply a ___________ to an object, its __________________ will change and it will  ______________."

• force, accelerate, gravity

• accelerate, inertia, gravity

• force, velocity, accelerate

• velocity, gravity, inertia

If μ_k = 0.65 and μ_s = 0.7, acceleration would be equal to

• 0 m/s/s

• 9.8 m/s/s

• 3.35 m/s/s

• -2.63 m/s/s

A 80 kg skydiver is free falling at a constant velocity of 19 m/s. What is the net (total) force acting on her?

• 1,520 N

• 0 N

• 4.21 N

• Not enough information to answer

The Earth pulls downward on a pingpong ball with a force  of 1N. If this is the "action" force, what is the "reaction" force?

• The ground exerts a force of 1N on the ping pong ball
• The ping pong ball exerts a force of 1 N on the Earth
• The ping pong ball pushes down on the earth with a force of 1N
• The is no reaction force when a gravitational force is involved

At 60 seconds, how far had this object traveled? 

• 0 m

• 10 m

• 20 m

• 40 m

The graph respresents

• no motion
• constant velocity
• increasing velocity
• decreasing velocity

At what time did runner A pass runner B?

• 0 seconds
• 1 second
• 2 seconds
• 3 seconds