IB PHYSICS KINEMATICS

An ice-hockey puck is slid along ice in a straight line. The puck travels at a steady speed of 20 m s^–1 and experiences no frictional force. How far does the puck travel in 2.5 s

• 5 m

• 8 m

• 25 m

• 50 m

The graph shows how an external force applied to an object of mass 2.0 kg varies with time. The object is initially at rest.

What is the speed of the object after 0.60 s?

• 7.0 m/s

• 14 m/s

• 18 m/s

• 28 m/s

A block of weight W slides down an inclined plane at a constant speed.

The normal reaction acting between the block and the plane is R and the frictional force between the block and the plane is F. The incline is at an angle θ to the horizontal. What is the magnitude of F ?

• R cos θ

• R sin θ

• W cos θ

• W sin θ

A body moves in a straight line. In order for the equations for uniformly accelerated motion to be applied, which condition must be true?

• A constant net force acts on the body of fixed mass.

• A constant net force acts on the body.

• The body falls towards the surface of a planet

• The body has an initial velocity of zero.

The graph shows the speed of a car as it accelerates from rest. During part of this time the acceleration is uniform.

What is the size of this uniform acceleration?

• 5 ms^-2

• 6 ms^-2

• 10 ms^-2

• 20 ms^-2

The graph shows the variation with time of the velocity of a truck of fixed mass.

What can be deduced from the graph?

• The truck is always accelerating.

• The truck is always moving.

• The truck is always moving in one direction.

• The displacement of the truck after time t is zero.

The resultant force acting on an object of mass 5.0 kg varies with time as shown. The object is initially at rest.

What is the speed of the object after 1.0 s?

• 0.50 m s–1

• 1.0 m s–1

• 1.5 m s–1

• 2.0 m s–1

A model plane flies with constant velocity at constant height. Which diagram represents the forces acting on the plane?

• 
• 
• 
• 

Two identical balls are dropped from a tall building, one a few seconds after the other. Air resistance is not negligible. As the balls fall, the distance between the balls will

• decrease

• increase.

• increase then remain constant

• remain constant.

Which of the following is always true for an object moving in a straight line at constant speed?

• No forces act on the object.

• No resultant force acts on the object.

• The momentum of the object is zero.

• No work is being done on the object.