Physics

The free body diagram shown shows the forces acting on an object proportionally (the longer the arrow, the greater the force). Which of the following statements are necessarily true?

• The object is not moving

• The object has constant acceleration

• The object has constant velocity.

• The object is moving

The free-body diagram shown shows the forces acting on an object proportionally (the longer the arrow, the greater the force). Which of the following statements are necessarily true?

• The object moves to the right

• The object moves to the left

• The object has constant acceleration

• The object has constant velocity

The free body diagram shown shows the forces acting on an object proportionally (this time the forces are not drawn proportionally). If we know that the object is moving to the left increasingly slowly, which of the following statements are necessarily true?

• F_A = F_B

• F_A > F_B

• F_A < F_B

The free body diagram shown shows the forces acting on an object proportionally (this time the forces are not drawn proportionally). If we know that the object is moving at a constant speed, which of the following statements are necessarily true?

• 𝐹_𝐴 = 𝐹_𝐵 + 𝐹_𝐶

• 𝐹_𝐴 = 𝐹_𝐵 - 𝐹_𝐶

• 𝐹_𝐴 > 𝐹_𝐵 + 𝐹_𝐶

• 𝐹_𝐴 < 𝐹_𝐵 + 𝐹_𝐶

Which of the following statements describe a negative work?

• An object in free fall

• A box in rest

• An airplane flying at a constant speed.

• A car braking

Which of the following statements describe a positive work?

• An object in free fall

• A box in rest

• An airplane flying at a constant speed.

• A car braking

Which of the following statements describe a zero work?

• An object in free fall

• A box in rest

• An airplane flying at a constant speed.

• A car braking

The diagram to the right shows the forces exerted on an object. We know that Force A is greater than the sum of Forces B and C. We also know that the object is slowing down, which of the following statements are necessarily true?

• The object moves to the right

• The object moves to the left

• The object has positive mechanical work

• The object has negative mechanical work

• The object has zero work

The drawing on the right shows a roller coaster and indicates three points of interest (A, B and C) where a cart stops during its journey. Furthermore there are no energy losses due to friction. Which of the following statements is necessarily true?

• The cart has greater Mechanical Energy at A than at the rest of the points.

• The cart has greater Kinetic Energy at A than at the rest of the points.

• The cart has greater Mechanical Energy at B than at the rest of the points.

• The cart has greater Kinetic Energy at B than at the rest of the points.

The drawing on the right shows a roller coaster and indicates three points of interest (A, B and C) where a cart stops during its journey. Furthermore there are no energy losses due to friction. Which of the following statements is necessarily true?

• The cart has greater Potential Energy at A than at the rest of the points.

• The cart has greater Potential Energy at B than at the rest of the points.

• The cart has greater Potential Energy at C than at the rest of the points.

• The cart receives positive Mechanical Work when it goes from A to B.

• The cart receives positive Mechanical Work when it goes from B to C.