Kinematics and Dynamics

The diagram shows a velocity–time graph for a car.

What is the distance travelled during the first 4.0 s?

• 2.5 m

• 3.0 m

• 20 m

• 28 m

The weights and masses of four different objects on the surfaces of four different planets are

shown.

Which planet has the lowest value of acceleration of free fall at its surface?

• A

• B

• C

• D

A student cycles uphill from home to a shop, taking 10 minutes. The student then spends 5 minutes in the shop, before cycling home downhill at twice the initial speed.

Which graph could show the variation with time of the distance travelled by the cyclist?

• A

• B

• C

• D

The velocity of an electric car changes as shown.

What is the acceleration of the car?

• 210 m s^-2

• 58 m s^-2

• 26 m s^-2

• 7.3 m s^-2

A wooden block rests on the rough surface of a board. One end of the board is then raised until the block slides down the board at constant velocity v.

What describes the forces acting on the block when it is sliding with constant velocity?

• frictional force on the block: down the board; resultant force on the block: down the board

• frictional force on the block: down the board; resultant force on the block: zero

• frictional force on the block: up the board; resultant force on the block: down the board

• frictional force on the block: up the board; resultant force on the block: zero

Four combinations of vectors are shown, each representing all the forces acting on an object. The forces all act in the same plane.

The object is in equilibrium.

Which combination of vectors could represent the forces acting on the object?

• A

• B

• C

• D