SAT Mechanics A - Forces and Motion

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The list below gives 5 measurements:

• A. Displacement
• B. Speed
• C. Velocity
• D. Acceleration
• E. Weight

Choose the answer above that best matches the following:

1. Which of these is a scalar quantity?

2. An athelete runs in at straight line at a constant 8m/s. Which of these measurements would be zero?

A boat is travelling on a river. The boat has a top speed of 2.5 m/s. The river flows at 1.5 m/s

• A. 100m
• B. 250m
• C. 350m
• D. 400m
• E. 500m

Choose the answer above that best matches the following:

3. The distance traveled up river in 100 seconds.

4. The total displacement from the start point by travelling down river for 100 seconds then back up river for another 50 seconds.

(Assume the change in direction is instant).

5. A school bus accelerates from 10 m/s to 20 m/s. For the first part of the journey the acceleration is constant. The bus then quickly reaches it's top speed.

Which of these graphs shows the motion up to this point?

6. This graph shows the bus approaching a traffic light. Which answer correctly states the total distance travelled and the decceleration of the bus?
• A. Distance = 40m, deceleration = 0.8 m/s2.
• B. Distance = 40m, deceleration = 1.25 m/s2.
• C. Distance = 40m, deceleration = 1.0 m/s2.
• D. Distance = 30m, deceleration = 0.8 m/s2.
• E. Distance = 30m, deceleration = 1.25 m/s2.
7. Two of Newton's famous laws of motion are ..
• statement X: "Action and reaction are equal and opposite."
• Statement Y: " An object will continue to travel in a straight line at constant velocity unless acted on by a force."

Which of Newtons Laws are these?

• A. X is the 1st law, Y is the 2nd law.
• B. X is the 2nd law, Y is the 3rd law.
• C. X is the 3rd law, Y is the 2nd law.
• D. X is the 3rd law, Y is the 1st law.
• E. X is the 1st law, Y is the 3rd law.

8. A remote controlled car is switched on and accelerates to the right from rest. Which of these free body diagrams correctly shows the relative sizes of the forces acting on the car?

9. Two stones are thrown from a building with identical speeds as shown. Which statements are true?

 Time to reach ground Range A. A and B hit at the same time A lands furthest from Building B. A is first to hit B lands furthest from Building C. B is first to hit B lands furthest from Building D. A is first to hit A lands furthest from Building E. B is first to hit A lands furthest from Building

10. Stone B above has a vertical and horizontal component of velocity. Which of these statements about the velocity is true?

• A. The horizontal and vertical velocities remains constant
• B. The vertical velocity decreases , the horizontal velocity remains constant
• C. The horizontal velocity increases , the vertical velocity remains constant
• D. The vertical velocity increases , the horizontal velocity remains constant
• E. The horizontal and vertical velocities increase