Vocabulary Vault
A student slides a block across the floor. The block slows down. What does this tell you about the forces acting on it?
a. Forces are balanced.
b. A force opposite the motion is acting on it.
c. There is no force.
d. The block ran out of momentum.
b. A force opposite the motion is acting on it.
A 10 kg cart accelerates at 2 m/s². What is the force applied?
a. 5 N
b. 10 N
c. 20 N
d. 40 N
c. 20 N
Two equal-mass soccer balls are kicked. Ball A changes speed more. Which experienced the stronger force?
a. Ball A
b. Ball B
c. Both equal
d. Neither
a. Ball A
A student pushes a chair. It keeps rolling until it slows down. Why?
a. The floor exerts friction
b. It loses all energy
c. Its mass changes
d. Gravity stops it
a. The floor exerts friction
Three identical chairs show equal-length arrows in different directions. What do the arrows represent?
a. Equal forces acting in different directions
b. Equal speeds
c. Unequal forces
d. Friction
a. Equal forces acting in different directions
When two equal forces act on an object in opposite directions, what happens?
a. It speeds up
b. It slows down
c. It keeps doing what it was doing
d. It moves backward
c. It keeps doing what it was doing.
A 4 kg object is pushed by 16 N. What is its acceleration?
a. 2 m/s²
b. 3 m/s²
c. 4 m/s²
d. 8 m/s²
c. 4 m/s²
A small car and a large truck collide and both change speed. The truck’s change is smaller. What does that tell you?
a. Truck had less force
b. Car had more force
c. Equal forces acted, truck had more mass
d. Unequal forces acted
c. Equal forces acted, truck had more mass
When a car suddenly stops, passengers lurch forward. Why?
a. Friction from seatbelts
b. Inertia keeps them moving
c. Gravity pulls them
d. Air resistance pushes
b. Inertia keeps them moving
Two soccer balls of equal mass, one with a longer forward arrow. Which experienced the stronger force?
a. Longer arrow
b. Shorter arrow
c. Both equal
d. Not enough info
a. Longer arrow
Which situation shows an unbalanced force?
a. A ball rolling at constant speed
b. A block sliding and slowing down
c. A book resting on a table
d. A rocket drifting in space
b. a block sliding and slowing down
Two objects have equal force. Object A = 5 kg, Object B = 10 kg. Which accelerates faster?
a. Object A
b. Object B
c. Both equally
d. Neither
a. Object A
Two hockey pucks (same mass) are hit from different directions. The puck with the longer arrow in the diagram...
a. Experienced a stronger force
b. Experienced less friction
c. Has more mass
d. Changed direction less
a. Experienced a stronger force
A basketball player dribbles a ball. Each time it hits the floor, it bounces back up. Which statement is true?
a. The floor pushes on the ball with an equal and opposite force
b. The ball exerts no force
c. The ball loses all energy
d. The floor absorbs the ball’s motion
a. The floor pushes on the ball with an equal and opposite force
Two hockey pucks collide. Arrows on each are equal and opposite. What can you infer?
a. Equal forces were applied.
b. Unequal forces were applied.
c. The red puck experienced less force.
d. The blue puck changed direction more.
a. Equal forces were applied.
Two objects are pushed with equal force, but one accelerates more. What explains this?
a. It has less mass
b. It has more friction
c. It’s heavier
d. It’s traveling uphill
a. It has less mass
A 12 kg wagon experiences 24 N forward and 6 N backward (friction). What’s the acceleration?
a 1.5 m/s²
b. 2 m/s²
c. 3 m/s²
d. 5 m/s²
a 1.5 m/s²
In two experiments, the same tennis ball is crashed into two soccer balls. The soccer ball with more mass causes the tennis ball to bounce back faster. Why?
a. The larger mass exerts a greater equal-and-opposite force
b. The lighter mass had no effect
c. The tennis ball was slower
d. The collisions were unbalanced
a. The larger mass exerts a greater equal-and-opposite force
A skateboarder collides with a wall and bounces backward. Which law does this show?
a. Newton’s 1st
b. Newton’s 2nd
c. Newton’s 3rd
d. Law of Inertia
c. Newton’s 3rd
The diagram shows a red puck (small mass) and a blue puck (large mass). Both have equal-length arrows after colliding. What is true?
a. Equal forces acted, but red puck changed speed more
b. Blue puck experienced stronger force
c. Red puck experienced less force
d. Blue puck changed direction more
a. Equal forces acted, but red puck changed speed more
A moving soccer ball is kicked again in the same direction. Describe how this affects the motion and net force.
a. Speed increases, net force forward
b. Speed stays the same, no net force
c. Speed decreases, net force backward
d. Force and speed are unrelated
a. Speed increases, net force forward
Two students push identical carts. Student A doubles the force used by Student B. What happens to acceleration?
a. Doubles
b. Halves
c. Stays same
d. Triples
a. Doubles
A planet and an asteroid collide. Both exert equal forces, but only the asteroid changes direction. What does this show?
a. The asteroid has less mass
b .The planet had greater force
c. The planet lost energy
d. The asteroid experienced no force
a. The asteroid has less mass
Two bumper cars of different mass collide. The lighter car changes speed twice as much. What conclusion can you make?
a. Equal forces acted; the lighter car’s smaller mass caused a greater change in motion
b. Unequal forces acted
c. The lighter car was pushed harder
d. The heavier car had less friction
a. Equal forces acted; the lighter car’s smaller mass caused a greater change in motion
Two asteroids collide. The smaller asteroid’s direction reverses with speed while the larger asteroid barely moves in the opposite direction. What does this show?
a. Equal forces acted; smaller mass caused greater speed change
b. Larger asteroid had greater force
c. Smaller asteroid had friction
d. Larger asteroid lost energy
a. Equal forces acted; smaller mass caused greater speed change