Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Unit 2 Force/Motion
| Question | Answer |
|---|---|
| What does Newton’s 1st Law say about motion? | Object keeps doing what it’s doing unless a force acts on it. (Skateboard keeps rolling until a rock stops it!) |
| What is inertia? | Inertia is an object’s resistance to change in motion. More mass = more inertia. |
| Why couldn’t the skater stop without the sign? | Because of inertia — no outside force to stop her. |
| Why can’t a rhinoceros turn as fast as a person? | It has greater mass and inertia — needs more force to change direction. |
| What happens when forces are balanced? | No change in motion — stays still or moves at constant speed. |
| What happens when forces are unbalanced? | Object accelerates in the direction of the larger force. |
| Balanced vs Unbalanced: What changes in speed? | Unbalanced → speed or direction changes. Balanced → no change. |
| Why do objects in space keep moving forever? | No friction in space, so inertia keeps them moving. |
| What is Newton’s 2nd Law formula? | F = m × a (Force = mass × acceleration) |
| If mass increases but force stays the same, what happens to acceleration? | It decreases — heavier objects need more force. |
| If mass doubles and acceleration stays the same, what happens to force? | Force doubles — they’re proportional. |
| What happens when more players push a sled? | More force = more acceleration (Newton’s 2nd Law) |
| What does “directly proportional” mean? | When one goes up, the other goes up (like force and mass). |
| Rosa doubles the cart’s mass; what happens to the needed force? | The force also doubles if acceleration stays constant. |
| A lighter cart moves faster under the same force — why? | Less mass = greater acceleration (proves F = m × a) |
| If acceleration increases and mass stays the same, what happens to force? | Force increases — F = m × a. |
| Why does a heavier car need more gas to accelerate? | More mass = needs more force → uses more fuel. |
| When mass doubles, what must happen to force to keep acceleration the same? | Force must double — shows direct proportionality (F = m × a). |
| If two cars have the same force but different masses, which accelerates faster? | The lighter car — less mass means greater acceleration. |
| Why does the 60 kg cart move slower than the 20 kg cart under the same force? | Because larger mass = smaller acceleration (Newton’s 2nd Law). |
| What does Newton’s 3rd Law say? | For every action, there’s an equal and opposite reaction. |
| When a ball hits a wall, what happens? | Ball pushes wall; wall pushes ball back — equal and opposite. |
| If two teams pull equally in tug-of-war, what happens? | Balanced forces → no motion. |
| When Jose pulls with 10 N right and Gina 8 N left, which way does the box move? | Toward Jose → unbalanced force to the right. |
| A student says balanced forces cause acceleration — correct? | Incorrect — acceleration needs unbalanced forces. |
| If two forces act in opposite directions (10 N right, 8 N left), what is the net force? | 2 N to the right — motion follows the larger force. |
| Why does a seatbelt keep you safe in a crash? | Inertia wants you to keep moving; the seatbelt provides the unbalanced force to stop you. |
| What does a flat line on a speed–time graph mean? | Constant speed — no acceleration. |
| What does a steep line on a speed–time graph mean? | Fast acceleration — speed changes quickly. |
| What does a downward line on a speed–time graph show? | Slowing down (negative acceleration). |
| What does a horizontal line on a velocity–time graph mean? | Constant velocity — zero acceleration. |
| If the line slopes upward steadily, what does that show? | Constant positive acceleration. |
| If a line goes up then down to zero, what does that mean? | Object moved forward then returned — zero displacement. |
| What does it mean if runner C’s line is straight and diagonal? | Steady speed — equal distance per time. |
| What if a graph’s slope changes? | Acceleration or deceleration — speed is changing. |
| If a graph line goes flat, what happens to speed? | No acceleration — constant motion. |
| If the speed–time graph line gets steeper, what does that mean? | Faster acceleration — slope shows rate of speed change. |
| If a line on a distance–time graph returns to zero, what happened? | Object returned to start — distance traveled but zero displacement. |
| Why didn’t Mario’s refrigerator move? | Friction force > Mario’s push → balanced forces = no motion. |
| Why does adding mass make pushing harder? | More mass = more inertia = needs more force. |
| What happens to gravity when mass increases? | Gravitational force increases with mass. |
| What happens if Jose pushes harder than Gina? | Box moves toward Jose — larger force wins (unbalanced). |
| What is net force? | The total of all forces acting on an object; decides motion. |
Created by:
user-1962177