Physics Quiz

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

• There are no forces acting on the rock.

• The only force acting on the rock is directed toward the sidewalk.

• The forces acting on the rock are all balanced.

The sidewalk exerts an unbalanced force on the rock.

Two forces are applied to a 17 kg box, as shown. The box is on a smooth surface. Which statement best describes the acceleration of the box?

• The box accelerates at 1.0 m/s² to the right because the net force is 17 N to the right.

• The box accelerates at 1.9 m/s² to the right because the greater force is to the right.

• The box accelerates at 3.0 m/s² because the combined forces cause the box to accelerate.

• The box does not accelerate, because neither force is large enough to move the box.

A player hits a baseball with a baseball bat. Part A: Which statement about the forces between the ball and the bat is correct?

• The force of the ball on the bat was less than the force of the bat on the ball.

• The force of the ball on the bat was equal to the force of the bat on the ball.

• The force of the ball on the bat was greater than the force of the bat on the ball.

A player hits a baseball with a baseball bat. Part A: Which statement about the forces between the ball and the bat is correct?

Part B: Which statement BEST supports the answer to Part A?

• Whenever two objects interact, the more massive object always applies a greater force than the less massive object.

• Whenever two objects interact, the faster object always applies a greater force than the slower object.

• Whenever two objects interact, they always apply equal and opposite forces on each other.

• Whenever two objects interact, their forces always combine and are applied in the direction of the object that is moving the fastest.

A researcher observes a car speeding up from rest. The researcher records data about the car and the car's motion. Which data points can be used to calculate the net force that was acting on the car when it was speeding up? Select TWO correct answers.

• The car's mass is 1,000 kg.

• The car's speed increased for 7 seconds.

• The car started from rest.

• The car's acceleration was 4 m/s².

• The car traveled a total of 300 m.

A student sets a 0.4 kilogram (kg) soccer ball on the ground and gives it a hard kick. The ball traveled a distance of 37 meters (m). The acceleration of the ball was 2,550 meters per second squared (m/s²). Based on the data, how much force in newtons (N) did the student apply to the ball?

(a)  

A toy truck is at rest on the floor. Which statement describes the forces acting on the toy truck?

• The forces are balanced so motion occurs.

• The forces are balanced so no motion occurs.

• The forces are unbalanced so motion occurs.

• The forces are unbalanced so no motion occurs.

A mother and daughter press their hands together and then push apart while ice skating. Immediately after they push away from each other, how does the motion of the mother and daughter change?

• They both move backward with equal speed.

• The mother moves faster than the daughter.

• The daughter moves faster than the mother.

• They both remain stationary.

The mother moves forward, and the daughter moves backward with a greater acceleration.

• The mother moves forward, and the daughter moves backward with a greater acceleration.

• Both move forward, but the mother moves with a greater acceleration.

• The mother moves backward, and the daughter moves forward with a greater acceleration.

• Both move backward, but the daughter moves with a greater acceleration.