Practice Free Body Diagrams

A leftward-moving car is skidding to a stop across a level roadway with locked wheels. Ignore air resistance.

What is the direction of the APPLIED force?

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• 
• 
• 
• There's no applied force

A baseball player did a head-first dive and is sliding to the right across the infield dirt. Ignore air resistance.

What is the direction of the FRICTION force?

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• 
• 
• 
• There's no friction force

A leftward-moving car is skidding to a stop across a level roadway with locked wheels. Ignore air resistance.

What is the direction of the FRICTION force?

• 
• 
• 
• 
• There's no friction force

A downward-moving skydiver is falling with constant speed.

What is the direction of the GRAVITIY force?

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• 
• 
• 
• There's no gravity force

A downward-moving skydiver is falling with constant speed.

What is the direction of the NORMAL force?

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• 
• 
• 
• There's no normal force

A baseball player did a head-first dive and is sliding to the right across the infield dirt. Ignore air resistance.

What is the direction of the APPLIED force?

• 
• 
• 
• 
• There's no applied force

A small elevator is secured to a motor by a cable and is moving upward. Ignore air resistance.

What is the force pulling upward?

• Friction force

• Normal force

• Applied force

• Tension force

• Gravity force

A football that was kicked is moving upward and rightward towards the maximum height of its trajectory. Ignore air resistance.

Which forces are acting on the football?

• Friction force

• Normal force

• Applied force

• Tension force

• Gravity force

A force is applied to a box to accelerate it to the left across the floor at a constant speed. Ignore air resistance.

Which force is stronger?

• Friction force

• Normal force

• Applied force

• They are all the same

• Gravity force

A baseball player did a head-first dive and is sliding to the right across the infield dirt. Ignore air resistance.

Which force is stronger?

• Friction force

• Normal force

• Applied force

• They are all the same

• Gravity force