Forces diagnostic quiz

The speed of the car is increasing. Which of the following best describes the size of these two forces, while the car is speeding up?

• A

• B

• C

• D

The car is travelling at a steady speed. Which of the following best describes the size of these two forces?

• A

• B

• C

• D

The car is slowing down. Which of the following best describes the size of these two forces?

• A

• B

• C

• D

A spacecraft is drifting through space. It is very far away from all other objects. There is no air in space, so there is no air resistance. The spacecraft is moving in a straight line at a constant speed. What force must the rockets exert to keep the spacecraft moving in this direction at constant speed?

• A

• B

• C

The captain of the spacecraft wants to make it move in the same direction, but with its speed getting steadily greater. What force must the rockets exert to do this?

• A

• B

• C

What force is needed to make the spacecraft slow down?

• A

• B

• C

Andy kicks a football across a level pitch. A shows where the ball is after a short time interval "t". It rolls to the point B and then stops. How would you describe the motion of the ball at the point A?

• A

• B

• C

Which of the following diagrams best shows the horizontal forces on the ball at point A? (Ignore any vertical forces.) The length of the arrow shows the size of the force.

• A

• B

• C

• D

• E

A sledge slides down a slope and then on to some level ice. How would you describe the motion of the sledge at the point A?

• A

• B

• C

Which of the following diagrams best shows the horizontal forces on the sledge at point A? (Ignore any vertical forces.) To simplify the diagrams, the sledge is just shown as a dot. The length of the arrow shows the size of the force.

• A

• B

• C

• D

• E